def __init__(self, config):
self.config = config
self.ui = None
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.running_video = False
self.tracker = CentroidTracker(
max_disappeared=int(self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.logger = Logger(self.config)
if self.device == 'Jetson':
from libs.detectors.jetson.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'EdgeTPU':
from libs.detectors.edgetpu.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'Dummy':
from libs.detectors.dummy.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'x86':
from libs.detectors.x86.detector import Detector
self.detector = Detector(self.config)
self.image_size = [int(i) for i in self.config.get_section_dict('Detector')['ImageSize'].split(',')]
if self.device != 'Dummy':
print('Device is: ', self.device)
print('Detector is: ', self.detector.name)
print('image size: ', self.image_size)
self.dist_method = self.config.get_section_dict("PostProcessor")["DistMethod"]
self.dist_threshold = self.config.get_section_dict("PostProcessor")["DistThreshold"]
def __init__(self, config, source, live_feed_enabled=True):
self.config = config
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.live_feed_enabled = live_feed_enabled
self.log_time_interval = float(self.config.get_section_dict("Logger")["TimeInterval"]) # Seconds
self.classifier = None
self.classifier_img_size = None
self.face_mask_classifier = None
self.running_video = False
self.tracker = CentroidTracker(
max_disappeared=int(self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.camera_id = self.config.get_section_dict(source)['Id']
self.logger = Logger(self.config, self.camera_id)
self.image_size = [int(i) for i in self.config.get_section_dict('Detector')['ImageSize'].split(',')]
self.default_dist_method = self.config.get_section_dict('PostProcessor')["DefaultDistMethod"]
if self.config.get_section_dict(source)["DistMethod"]:
self.dist_method = self.config.get_section_dict(source)["DistMethod"]
else:
self.dist_method = self.default_dist_method
self.dist_threshold = self.config.get_section_dict("PostProcessor")["DistThreshold"]
self.resolution = tuple([int(i) for i in self.config.get_section_dict('App')['Resolution'].split(',')])
self.birds_eye_resolution = (200, 300)
if self.dist_method == "CalibratedDistance":
calibration_file = get_camera_calibration_path(
self.config, self.config.get_section_dict(source)["Id"])
try:
with open(calibration_file, "r") as file:
self.h_inv = file.readlines()[0].split(" ")[1:]
self.h_inv = np.array(self.h_inv, dtype="float").reshape((3, 3))
except FileNotFoundError:
logger.error("The specified 'CalibrationFile' does not exist")
logger.info(f"Falling back using {self.default_dist_method}")
self.dist_method = self.default_dist_method
# config.ini uses minutes as unit
self.screenshot_period = float(self.config.get_section_dict("App")["ScreenshotPeriod"]) * 60
self.bucket_screenshots = config.get_section_dict("App")["ScreenshotS3Bucket"]
self.uploader = S3Uploader(self.config)
self.screenshot_path = os.path.join(self.config.get_section_dict("App")["ScreenshotsDirectory"], self.camera_id)
if not os.path.exists(self.screenshot_path):
os.makedirs(self.screenshot_path)
if "Classifier" in self.config.get_sections():
self.face_threshold = float(self.config.get_section_dict("Classifier").get("MinScore", 0.75))
def __init__(self, config):
self.config = config
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.running_video = False
self.tracker = CentroidTracker(max_disappeared=int(
self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.logger = Logger(self.config)
self.image_size = [
int(i) for i in self.config.get_section_dict('Detector')
['ImageSize'].split(',')
]
self.dist_method = self.config.get_section_dict(
"PostProcessor")["DistMethod"]
self.dist_threshold = self.config.get_section_dict(
"PostProcessor")["DistThreshold"]
self.resolution = tuple([
int(i) for i in self.config.get_section_dict('App')
['Resolution'].split(',')
])
self.birds_eye_resolution = (200, 300)
class Distancing:
def __init__(self, config):
self.config = config
self.ui = None
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.running_video = False
self.tracker = CentroidTracker(
max_disappeared=int(self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.logger = Logger(self.config)
if self.device == 'Jetson':
from libs.detectors.jetson.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'EdgeTPU':
from libs.detectors.edgetpu.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'Dummy':
from libs.detectors.dummy.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'x86':
from libs.detectors.x86.detector import Detector
self.detector = Detector(self.config)
self.image_size = [int(i) for i in self.config.get_section_dict('Detector')['ImageSize'].split(',')]
if self.device != 'Dummy':
print('Device is: ', self.device)
print('Detector is: ', self.detector.name)
print('image size: ', self.image_size)
self.dist_method = self.config.get_section_dict("PostProcessor")["DistMethod"]
self.dist_threshold = self.config.get_section_dict("PostProcessor")["DistThreshold"]
def set_ui(self, ui):
self.ui = ui
def __process(self, cv_image):
"""
return object_list list of dict for each obj,
obj["bbox"] is normalized coordinations for [x0, y0, x1, y1] of box
"""
# Resize input image to resolution
resolution = [int(i) for i in self.config.get_section_dict('App')['Resolution'].split(',')]
cv_image = cv.resize(cv_image, tuple(resolution))
resized_image = cv.resize(cv_image, tuple(self.image_size[:2]))
rgb_resized_image = cv.cvtColor(resized_image, cv.COLOR_BGR2RGB)
tmp_objects_list = self.detector.inference(rgb_resized_image)
[w,h] = resolution
for obj in tmp_objects_list:
box = obj["bbox"]
x0 = box[1]
y0 = box[0]
x1 = box[3]
y1 = box[2]
obj["centroid"] = [(x0 + x1) / 2, (y0 + y1) / 2, x1 - x0, y1 - y0]
obj["bbox"] = [x0, y0, x1, y1]
obj["centroidReal"]=[(x0 + x1)*w / 2, (y0 + y1)*h / 2, (x1 - x0)*w, (y1 - y0)*h]
obj["bboxReal"]=[x0*w,y0*h,x1*w,y1*h]
objects_list, distancings = self.calculate_distancing(tmp_objects_list)
return cv_image, objects_list, distancings
def process_video(self, video_uri):
input_cap = cv.VideoCapture(video_uri)
if (input_cap.isOpened()):
print('opened video ', video_uri)
else:
print('failed to load video ', video_uri)
return
self.running_video = True
while input_cap.isOpened() and self.running_video:
_, cv_image = input_cap.read()
if np.shape(cv_image) != ():
cv_image, objects, distancings = self.__process(cv_image)
else:
continue
self.logger.update(objects, distancings)
self.ui.update(cv_image, objects, distancings)
input_cap.release()
self.running_video = False
def process_image(self, image_path):
# Process and pass the image to ui modules
cv_image = cv.imread(image_path)
cv_image, objects, distancings = self.__process(cv_image)
self.ui.update(cv_image, objects, distancings)
def calculate_distancing(self, objects_list):
"""
this function post-process the raw boxes of object detector and calculate a distance matrix
for detected bounding boxes.
post processing is consist of:
1. omitting large boxes by filtering boxes which are biger than the 1/4 of the size the image.
2. omitting duplicated boxes by applying an auxilary non-maximum-suppression.
3. apply a simple object tracker to make the detection more robust.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: the post processed version of the input
distances: a NxN ndarray which i,j element is distance between i-th and l-th bounding box
"""
new_objects_list = self.ignore_large_boxes(objects_list)
new_objects_list = self.non_max_suppression_fast(new_objects_list,
float(self.config.get_section_dict("PostProcessor")[
"NMSThreshold"]))
tracked_boxes = self.tracker.update(new_objects_list)
new_objects_list = [tracked_boxes[i] for i in tracked_boxes.keys()]
for i, item in enumerate(new_objects_list):
item["id"] = item["id"].split("-")[0] + "-" + str(i)
centroids = np.array( [obj["centroid"] for obj in new_objects_list] )
distances = self.calculate_box_distances(new_objects_list)
return new_objects_list, distances
@staticmethod
def ignore_large_boxes(object_list):
"""
filtering boxes which are biger than the 1/4 of the size the image
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: input object list without large boxes
"""
large_boxes = []
for i in range(len(object_list)):
if (object_list[i]["centroid"][2] * object_list[i]["centroid"][3]) > 0.25:
large_boxes.append(i)
updated_object_list = [j for i, j in enumerate(object_list) if i not in large_boxes]
return updated_object_list
@staticmethod
def non_max_suppression_fast(object_list, overlapThresh):
"""
omitting duplicated boxes by applying an auxilary non-maximum-suppression.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
overlapThresh: threshold of minimum IoU of to detect two box as duplicated.
returns:
object_list: input object list without duplicated boxes
"""
# if there are no boxes, return an empty list
boxes = np.array([item["centroid"] for item in object_list])
corners = np.array([item["bbox"] for item in object_list])
if len(boxes) == 0:
return []
if boxes.dtype.kind == "i":
boxes = boxes.astype("float")
# initialize the list of picked indexes
pick = []
cy = boxes[:, 1]
cx = boxes[:, 0]
h = boxes[:, 3]
w = boxes[:, 2]
x1 = corners[:, 0]
x2 = corners[:, 2]
y1 = corners[:, 1]
y2 = corners[:, 3]
area = (h + 1) * (w + 1)
idxs = np.argsort(cy + (h / 2))
while len(idxs) > 0:
last = len(idxs) - 1
i = idxs[last]
pick.append(i)
xx1 = np.maximum(x1[i], x1[idxs[:last]])
yy1 = np.maximum(y1[i], y1[idxs[:last]])
xx2 = np.minimum(x2[i], x2[idxs[:last]])
yy2 = np.minimum(y2[i], y2[idxs[:last]])
w = np.maximum(0, xx2 - xx1 + 1)
h = np.maximum(0, yy2 - yy1 + 1)
# compute the ratio of overlap
overlap = (w * h) / area[idxs[:last]]
# delete all indexes from the index list that have
idxs = np.delete(idxs, np.concatenate(([last],
np.where(overlap > overlapThresh)[0])))
updated_object_list = [j for i, j in enumerate(object_list) if i in pick]
return updated_object_list
def calculate_distance_of_two_points_of_boxes(self,first_point, second_point):
"""
This function calculates a distance l for two input corresponding points of two detected bounding boxes.
it is assumed that each person is H = 170 cm tall in real scene to map the distances in the image (in pixels) to
physical distance measures (in meters).
params:
first_point: (x, y, h)-tuple, where x,y is the location of a point (center or each of 4 corners of a bounding box)
and h is the height of the bounding box.
second_point: same tuple as first_point for the corresponding point of other box
returns:
l: Estimated physical distance (in centimeters) between first_point and second_point.
"""
# estimate corresponding points distance
[xc1, yc1, h1] = first_point
[xc2, yc2, h2] = second_point
dx = xc2 - xc1
dy = yc2 - yc1
lx = dx * 170 * (1/h1 + 1/h2)/2
ly = dy * 170 * (1/h1 + 1/h2)/2
l=math.sqrt(lx**2+ly**2)
return l
def calculate_box_distances(self, nn_out):
"""
This function calculates a distance matrix for detected bounding boxes.
Two methods are implemented to calculate the distances, first one estimates distance of center points of the
boxes and second one uses minimum distance of each of 4 points of bounding boxes.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroidReal" (a tuple of the centroid coordinates (cx,cy,w,h) of the box) and "bboxReal" (a tuple
of the (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
distances: a NxN ndarray which i,j element is estimated distance between i-th and j-th bounding box in real scene (cm)
"""
distances = []
for i in range(len(nn_out)):
distance_row=[]
for j in range(len(nn_out)):
if i == j:
l = 0
else:
if ( self.dist_method == 'FourCornerPointsDistance' ):
lower_left_of_first_box = [nn_out[i]["bboxReal"][0],nn_out[i]["bboxReal"][1],nn_out[i]["centroidReal"][3]]
lower_right_of_first_box = [nn_out[i]["bboxReal"][2],nn_out[i]["bboxReal"][1],nn_out[i]["centroidReal"][3]]
upper_left_of_first_box = [nn_out[i]["bboxReal"][0],nn_out[i]["bboxReal"][3],nn_out[i]["centroidReal"][3]]
upper_right_of_first_box = [nn_out[i]["bboxReal"][2],nn_out[i]["bboxReal"][3],nn_out[i]["centroidReal"][3]]
lower_left_of_second_box = [nn_out[j]["bboxReal"][0],nn_out[j]["bboxReal"][1],nn_out[j]["centroidReal"][3]]
lower_right_of_second_box = [nn_out[j]["bboxReal"][2],nn_out[j]["bboxReal"][1],nn_out[j]["centroidReal"][3]]
upper_left_of_second_box = [nn_out[j]["bboxReal"][0],nn_out[j]["bboxReal"][3],nn_out[j]["centroidReal"][3]]
upper_right_of_second_box = [nn_out[j]["bboxReal"][2],nn_out[j]["bboxReal"][3],nn_out[j]["centroidReal"][3]]
l1 = self.calculate_distance_of_two_points_of_boxes(lower_left_of_first_box, lower_left_of_second_box)
l2 = self.calculate_distance_of_two_points_of_boxes(lower_right_of_first_box, lower_right_of_second_box)
l3 = self.calculate_distance_of_two_points_of_boxes(upper_left_of_first_box, upper_left_of_second_box)
l4 = self.calculate_distance_of_two_points_of_boxes(upper_right_of_first_box, upper_right_of_second_box)
l = min(l1, l2, l3, l4)
elif ( self.dist_method == 'CenterPointsDistance' ):
center_of_first_box = [nn_out[i]["centroidReal"][0],nn_out[i]["centroidReal"][1],nn_out[i]["centroidReal"][3]]
center_of_second_box = [nn_out[j]["centroidReal"][0],nn_out[j]["centroidReal"][1],nn_out[j]["centroidReal"][3]]
l = self.calculate_distance_of_two_points_of_boxes(center_of_first_box, center_of_second_box)
distance_row.append(l)
distances.append(distance_row)
distances_asarray = np.asarray(distances, dtype=np.float32)
return distances_asarray
class Distancing:
def __init__(self, config):
self.config = config
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.running_video = False
self.tracker = CentroidTracker(max_disappeared=int(
self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.logger = Logger(self.config)
if self.device == 'Jetson':
from libs.detectors.jetson.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'EdgeTPU':
from libs.detectors.edgetpu.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'Dummy':
from libs.detectors.dummy.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'x86':
from libs.detectors.x86.detector import Detector
self.detector = Detector(self.config)
self.image_size = [
int(i) for i in self.config.get_section_dict('Detector')
['ImageSize'].split(',')
]
if self.device != 'Dummy':
print('Device is: ', self.device)
print('Detector is: ', self.detector.name)
print('image size: ', self.image_size)
self.dist_method = self.config.get_section_dict(
"PostProcessor")["DistMethod"]
self.dist_threshold = self.config.get_section_dict(
"PostProcessor")["DistThreshold"]
self.resolution = tuple([
int(i) for i in self.config.get_section_dict('App')
['Resolution'].split(',')
])
def __process(self, cv_image):
"""
return object_list list of dict for each obj,
obj["bbox"] is normalized coordinations for [x0, y0, x1, y1] of box
"""
# Resize input image to resolution
cv_image = cv.resize(cv_image, self.resolution)
resized_image = cv.resize(cv_image, tuple(self.image_size[:2]))
rgb_resized_image = cv.cvtColor(resized_image, cv.COLOR_BGR2RGB)
tmp_objects_list = self.detector.inference(rgb_resized_image)
[w, h] = self.resolution
for obj in tmp_objects_list:
box = obj["bbox"]
x0 = box[1]
y0 = box[0]
x1 = box[3]
y1 = box[2]
obj["centroid"] = [(x0 + x1) / 2, (y0 + y1) / 2, x1 - x0, y1 - y0]
obj["bbox"] = [x0, y0, x1, y1]
obj["centroidReal"] = [(x0 + x1) * w / 2, (y0 + y1) * h / 2,
(x1 - x0) * w, (y1 - y0) * h]
obj["bboxReal"] = [x0 * w, y0 * h, x1 * w, y1 * h]
objects_list, distancings = self.calculate_distancing(tmp_objects_list)
return cv_image, objects_list, distancings
def process_video(self, video_uri):
input_cap = cv.VideoCapture(video_uri)
if (input_cap.isOpened()):
print('opened video ', video_uri)
else:
print('failed to load video ', video_uri)
return
self.running_video = True
dist_threshold = float(
self.config.get_section_dict("PostProcessor")["DistThreshold"])
class_id = int(self.config.get_section_dict('Detector')['ClassID'])
send = pubsub.init_publisher(
'default'
) # TODO hossein: replace default with camera-id in multi-camera
send_birds_eye = pubsub.init_publisher('default-birdseye')
while input_cap.isOpened() and self.running_video:
_, cv_image = input_cap.read()
birds_eye_window = np.zeros((300, 200, 3), dtype="uint8")
if np.shape(cv_image) != ():
cv_image, objects, distancings = self.__process(cv_image)
output_dict = visualization_utils.visualization_preparation(
objects, distancings, dist_threshold)
category_index = {
class_id: {
"id": class_id,
"name": "Pedestrian",
}
} # TODO: json file for detector config
# Draw bounding boxes and other visualization factors on input_frame
visualization_utils.visualize_boxes_and_labels_on_image_array(
cv_image,
output_dict["detection_boxes"],
output_dict["detection_classes"],
output_dict["detection_scores"],
output_dict["detection_colors"],
category_index,
instance_masks=output_dict.get("detection_masks"),
use_normalized_coordinates=True,
line_thickness=3,
)
# TODO: Implement perspective view for objects
birds_eye_window = visualization_utils.birds_eye_view(
birds_eye_window, output_dict["detection_boxes"],
output_dict["violating_objects"])
try:
fps = self.detector.fps
except:
# fps is not implemented for the detector instance"
fps = None
# Put fps to the frame
# region
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
txt_fps = 'Frames rate = ' + str(
fps) + '(fps)' # Frames rate = 95 (fps)
# (0, 0) is the top-left (x,y); normalized number between 0-1
origin = (0.05, 0.93)
visualization_utils.text_putter(cv_image, txt_fps, origin)
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
# endregion
# Put environment score to the frame
# region
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
violating_objects = extract_violating_objects(
distancings, dist_threshold)
env_score = mx_environment_scoring_consider_crowd(
len(objects), len(violating_objects))
txt_env_score = 'Env Score = ' + str(
env_score) # Env Score = 0.7
origin = (0.05, 0.98)
visualization_utils.text_putter(cv_image, txt_env_score,
origin)
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
# endregion
_, cv_image = cv.imencode(".jpeg", cv_image)
_, birds_eye_window = cv.imencode(".jpeg", birds_eye_window)
send(bytearray(cv_image))
send_birds_eye(bytearray(birds_eye_window))
else:
continue
self.logger.update(objects, distancings)
input_cap.release()
self.running_video = False
def calculate_distancing(self, objects_list):
"""
this function post-process the raw boxes of object detector and calculate a distance matrix
for detected bounding boxes.
post processing is consist of:
1. omitting large boxes by filtering boxes which are biger than the 1/4 of the size the image.
2. omitting duplicated boxes by applying an auxilary non-maximum-suppression.
3. apply a simple object tracker to make the detection more robust.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: the post processed version of the input
distances: a NxN ndarray which i,j element is distance between i-th and l-th bounding box
"""
new_objects_list = self.ignore_large_boxes(objects_list)
new_objects_list = self.non_max_suppression_fast(
new_objects_list,
float(
self.config.get_section_dict("PostProcessor")["NMSThreshold"]))
tracked_boxes = self.tracker.update(new_objects_list)
new_objects_list = [tracked_boxes[i] for i in tracked_boxes.keys()]
for i, item in enumerate(new_objects_list):
item["id"] = item["id"].split("-")[0] + "-" + str(i)
centroids = np.array([obj["centroid"] for obj in new_objects_list])
distances = self.calculate_box_distances(new_objects_list)
return new_objects_list, distances
@staticmethod
def ignore_large_boxes(object_list):
"""
filtering boxes which are biger than the 1/4 of the size the image
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: input object list without large boxes
"""
large_boxes = []
for i in range(len(object_list)):
if (object_list[i]["centroid"][2] *
object_list[i]["centroid"][3]) > 0.25:
large_boxes.append(i)
updated_object_list = [
j for i, j in enumerate(object_list) if i not in large_boxes
]
return updated_object_list
@staticmethod
def non_max_suppression_fast(object_list, overlapThresh):
"""
omitting duplicated boxes by applying an auxilary non-maximum-suppression.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
overlapThresh: threshold of minimum IoU of to detect two box as duplicated.
returns:
object_list: input object list without duplicated boxes
"""
# if there are no boxes, return an empty list
boxes = np.array([item["centroid"] for item in object_list])
corners = np.array([item["bbox"] for item in object_list])
if len(boxes) == 0:
return []
if boxes.dtype.kind == "i":
boxes = boxes.astype("float")
# initialize the list of picked indexes
pick = []
cy = boxes[:, 1]
cx = boxes[:, 0]
h = boxes[:, 3]
w = boxes[:, 2]
x1 = corners[:, 0]
x2 = corners[:, 2]
y1 = corners[:, 1]
y2 = corners[:, 3]
area = (h + 1) * (w + 1)
idxs = np.argsort(cy + (h / 2))
while len(idxs) > 0:
last = len(idxs) - 1
i = idxs[last]
pick.append(i)
xx1 = np.maximum(x1[i], x1[idxs[:last]])
yy1 = np.maximum(y1[i], y1[idxs[:last]])
xx2 = np.minimum(x2[i], x2[idxs[:last]])
yy2 = np.minimum(y2[i], y2[idxs[:last]])
w = np.maximum(0, xx2 - xx1 + 1)
h = np.maximum(0, yy2 - yy1 + 1)
# compute the ratio of overlap
overlap = (w * h) / area[idxs[:last]]
# delete all indexes from the index list that have
idxs = np.delete(
idxs,
np.concatenate(([last], np.where(overlap > overlapThresh)[0])))
updated_object_list = [
j for i, j in enumerate(object_list) if i in pick
]
return updated_object_list
def calculate_distance_of_two_points_of_boxes(self, first_point,
second_point):
"""
This function calculates a distance l for two input corresponding points of two detected bounding boxes.
it is assumed that each person is H = 170 cm tall in real scene to map the distances in the image (in pixels) to
physical distance measures (in meters).
params:
first_point: (x, y, h)-tuple, where x,y is the location of a point (center or each of 4 corners of a bounding box)
and h is the height of the bounding box.
second_point: same tuple as first_point for the corresponding point of other box
returns:
l: Estimated physical distance (in centimeters) between first_point and second_point.
"""
# estimate corresponding points distance
[xc1, yc1, h1] = first_point
[xc2, yc2, h2] = second_point
dx = xc2 - xc1
dy = yc2 - yc1
lx = dx * 170 * (1 / h1 + 1 / h2) / 2
ly = dy * 170 * (1 / h1 + 1 / h2) / 2
l = math.sqrt(lx**2 + ly**2)
return l
def calculate_box_distances(self, nn_out):
"""
This function calculates a distance matrix for detected bounding boxes.
Two methods are implemented to calculate the distances, first one estimates distance of center points of the
boxes and second one uses minimum distance of each of 4 points of bounding boxes.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroidReal" (a tuple of the centroid coordinates (cx,cy,w,h) of the box) and "bboxReal" (a tuple
of the (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
distances: a NxN ndarray which i,j element is estimated distance between i-th and j-th bounding box in real scene (cm)
"""
distances = []
for i in range(len(nn_out)):
distance_row = []
for j in range(len(nn_out)):
if i == j:
l = 0
else:
if (self.dist_method == 'FourCornerPointsDistance'):
lower_left_of_first_box = [
nn_out[i]["bboxReal"][0], nn_out[i]["bboxReal"][1],
nn_out[i]["centroidReal"][3]
]
lower_right_of_first_box = [
nn_out[i]["bboxReal"][2], nn_out[i]["bboxReal"][1],
nn_out[i]["centroidReal"][3]
]
upper_left_of_first_box = [
nn_out[i]["bboxReal"][0], nn_out[i]["bboxReal"][3],
nn_out[i]["centroidReal"][3]
]
upper_right_of_first_box = [
nn_out[i]["bboxReal"][2], nn_out[i]["bboxReal"][3],
nn_out[i]["centroidReal"][3]
]
lower_left_of_second_box = [
nn_out[j]["bboxReal"][0], nn_out[j]["bboxReal"][1],
nn_out[j]["centroidReal"][3]
]
lower_right_of_second_box = [
nn_out[j]["bboxReal"][2], nn_out[j]["bboxReal"][1],
nn_out[j]["centroidReal"][3]
]
upper_left_of_second_box = [
nn_out[j]["bboxReal"][0], nn_out[j]["bboxReal"][3],
nn_out[j]["centroidReal"][3]
]
upper_right_of_second_box = [
nn_out[j]["bboxReal"][2], nn_out[j]["bboxReal"][3],
nn_out[j]["centroidReal"][3]
]
l1 = self.calculate_distance_of_two_points_of_boxes(
lower_left_of_first_box, lower_left_of_second_box)
l2 = self.calculate_distance_of_two_points_of_boxes(
lower_right_of_first_box,
lower_right_of_second_box)
l3 = self.calculate_distance_of_two_points_of_boxes(
upper_left_of_first_box, upper_left_of_second_box)
l4 = self.calculate_distance_of_two_points_of_boxes(
upper_right_of_first_box,
upper_right_of_second_box)
l = min(l1, l2, l3, l4)
elif (self.dist_method == 'CenterPointsDistance'):
center_of_first_box = [
nn_out[i]["centroidReal"][0],
nn_out[i]["centroidReal"][1],
nn_out[i]["centroidReal"][3]
]
center_of_second_box = [
nn_out[j]["centroidReal"][0],
nn_out[j]["centroidReal"][1],
nn_out[j]["centroidReal"][3]
]
l = self.calculate_distance_of_two_points_of_boxes(
center_of_first_box, center_of_second_box)
distance_row.append(l)
distances.append(distance_row)
distances_asarray = np.asarray(distances, dtype=np.float32)
return distances_asarray
class Distancing:
def __init__(self, config):
self.config = config
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.running_video = False
self.tracker = CentroidTracker(
max_disappeared=int(self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.logger = Logger(self.config)
if self.device == 'Jetson':
from libs.detectors.jetson.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'EdgeTPU':
from libs.detectors.edgetpu.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'Dummy':
from libs.detectors.dummy.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'x86':
from libs.detectors.x86.detector import Detector
self.detector = Detector(self.config)
self.image_size = [int(i) for i in self.config.get_section_dict('Detector')['ImageSize'].split(',')]
if self.device != 'Dummy':
print('Device is: ', self.device)
print('Detector is: ', self.detector.name)
print('image size: ', self.image_size)
self.dist_method = self.config.get_section_dict("PostProcessor")["DistMethod"]
self.dist_threshold = self.config.get_section_dict("PostProcessor")["DistThreshold"]
self.resolution = tuple([int(i) for i in self.config.get_section_dict('App')['Resolution'].split(',')])
self.birds_eye_resolution = (200, 300)
def __process(self, cv_image):
"""
return object_list list of dict for each obj,
obj["bbox"] is normalized coordinations for [x0, y0, x1, y1] of box
"""
# Resize input image to resolution
cv_image = cv.resize(cv_image, self.resolution)
resized_image = cv.resize(cv_image, tuple(self.image_size[:2]))
rgb_resized_image = cv.cvtColor(resized_image, cv.COLOR_BGR2RGB)
tmp_objects_list = self.detector.inference(rgb_resized_image)
[w, h] = self.resolution
for obj in tmp_objects_list:
box = obj["bbox"]
x0 = box[1]
y0 = box[0]
x1 = box[3]
y1 = box[2]
obj["centroid"] = [(x0 + x1) / 2, (y0 + y1) / 2, x1 - x0, y1 - y0]
obj["bbox"] = [x0, y0, x1, y1]
obj["centroidReal"] = [(x0 + x1) * w / 2, (y0 + y1) * h / 2, (x1 - x0) * w, (y1 - y0) * h]
obj["bboxReal"] = [x0 * w, y0 * h, x1 * w, y1 * h]
objects_list, distancings = self.calculate_distancing(tmp_objects_list)
return cv_image, objects_list, distancings
def gstreamer_writer(self, feed_name, fps, resolution):
"""
This method creates and returns an OpenCV Video Writer instance. The VideoWriter expects its `.write()` method
to be called with a single frame image multiple times. It encodes frames into live video segments and produces
a video segment once it has received enough frames to produce a 5-seconds segment of live video.
The video segments are written on the filesystem. The target directory for writing segments is determined by
`video_root` variable. In addition to writing the video segments, the VideoWriter also updates a file named
playlist.m3u8 in the target directory. This file contains the list of generated video segments and is updated
automatically.
This instance does not serve these video segments to the client. It is expected that the target video directory
is being served by a static file server and the clientside HLS video library downloads "playlist.m3u8". Then,
the client video player reads the link for video segments, according to HLS protocol, and downloads them from
static file server.
:param feed_name: Is the name for video feed. We may have multiple cameras, each with multiple video feeds (e.g. one
feed for visualizing bounding boxes and one for bird's eye view). Each video feed should be written into a
separate directory. The name for target directory is defined by this variable.
:param fps: The HLS video player on client side needs to know how many frames should be shown to the user per
second. This parameter is independent from the frame rate with which the video is being processed. For example,
if we set fps=60, but produce only frames (by calling `.write()`) per second, the client will see a loading
indicator for 5*60/30 seconds and then 5 seconds of video is played with fps 60.
:param resolution: A tuple of size 2 which indicates the resolution of output video.
"""
encoder = self.config.get_section_dict('App')['Encoder']
video_root = f'/repo/data/web_gui/static/gstreamer/{feed_name}'
shutil.rmtree(video_root, ignore_errors=True)
os.makedirs(video_root, exist_ok=True)
playlist_root = f'/static/gstreamer/{feed_name}'
if not playlist_root.endswith('/'):
playlist_root = f'{playlist_root}/'
# the entire encoding pipeline, as a string:
pipeline = f'appsrc is-live=true ! {encoder} ! mpegtsmux ! hlssink max-files=15 ' \
f'target-duration=5 ' \
f'playlist-root={playlist_root} ' \
f'location={video_root}/video_%05d.ts ' \
f'playlist-location={video_root}/playlist.m3u8 '
out = cv.VideoWriter(
pipeline,
cv.CAP_GSTREAMER,
0, fps, resolution
)
if not out.isOpened():
raise RuntimeError("Could not open gstreamer output for " + feed_name)
return out
def process_video(self, video_uri):
input_cap = cv.VideoCapture(video_uri)
fps = input_cap.get(cv.CAP_PROP_FPS)
if (input_cap.isOpened()):
logger.info(f'opened video {video_uri}')
else:
logger.error(f'failed to load video {video_uri}')
return
self.running_video = True
# enable logging gstreamer Errors (https://stackoverflow.com/questions/3298934/how-do-i-view-gstreamer-debug-output)
os.environ['GST_DEBUG'] = "*:1"
out, out_birdseye = (
self.gstreamer_writer(feed, fps, resolution)
for (feed, resolution) in (
('default', self.resolution),
('default-birdseye', self.birds_eye_resolution)
) # TODO: use camera-id
)
dist_threshold = float(self.config.get_section_dict("PostProcessor")["DistThreshold"])
class_id = int(self.config.get_section_dict('Detector')['ClassID'])
frame_num = 0
while input_cap.isOpened() and self.running_video:
_, cv_image = input_cap.read()
birds_eye_window = np.zeros(self.birds_eye_resolution[::-1] + (3,), dtype="uint8")
if np.shape(cv_image) != ():
cv_image, objects, distancings = self.__process(cv_image)
output_dict = visualization_utils.visualization_preparation(objects, distancings, dist_threshold)
category_index = {class_id: {
"id": class_id,
"name": "Pedestrian",
}} # TODO: json file for detector config
# Draw bounding boxes and other visualization factors on input_frame
visualization_utils.visualize_boxes_and_labels_on_image_array(
cv_image,
output_dict["detection_boxes"],
output_dict["detection_classes"],
output_dict["detection_scores"],
output_dict["detection_colors"],
category_index,
instance_masks=output_dict.get("detection_masks"),
use_normalized_coordinates=True,
line_thickness=3,
)
# TODO: Implement perspective view for objects
birds_eye_window = visualization_utils.birds_eye_view(birds_eye_window, output_dict["detection_boxes"],
output_dict["violating_objects"])
try:
fps = self.detector.fps
except:
# fps is not implemented for the detector instance"
fps = None
# Put fps to the frame
# region
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
txt_fps = 'Frames rate = ' + str(fps) + '(fps)' # Frames rate = 95 (fps)
# (0, 0) is the top-left (x,y); normalized number between 0-1
origin = (0.05, 0.93)
visualization_utils.text_putter(cv_image, txt_fps, origin)
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
# endregion
# Put environment score to the frame
# region
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
violating_objects = extract_violating_objects(distancings, dist_threshold)
env_score = mx_environment_scoring_consider_crowd(len(objects), len(violating_objects))
txt_env_score = 'Env Score = ' + str(env_score) # Env Score = 0.7
origin = (0.05, 0.98)
visualization_utils.text_putter(cv_image, txt_env_score, origin)
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
# endregion
out.write(cv_image)
out_birdseye.write(birds_eye_window)
frame_num += 1
if frame_num % 1000 == 1:
logger.info(f'processed frame {frame_num} for {video_uri}')
else:
continue
self.logger.update(objects, distancings)
input_cap.release()
out.release()
out_birdseye.release()
self.running_video = False
def calculate_distancing(self, objects_list):
"""
this function post-process the raw boxes of object detector and calculate a distance matrix
for detected bounding boxes.
post processing is consist of:
1. omitting large boxes by filtering boxes which are biger than the 1/4 of the size the image.
2. omitting duplicated boxes by applying an auxilary non-maximum-suppression.
3. apply a simple object tracker to make the detection more robust.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: the post processed version of the input
distances: a NxN ndarray which i,j element is distance between i-th and l-th bounding box
"""
new_objects_list = self.ignore_large_boxes(objects_list)
new_objects_list = self.non_max_suppression_fast(new_objects_list,
float(self.config.get_section_dict("PostProcessor")[
"NMSThreshold"]))
tracked_boxes = self.tracker.update(new_objects_list)
new_objects_list = [tracked_boxes[i] for i in tracked_boxes.keys()]
for i, item in enumerate(new_objects_list):
item["id"] = item["id"].split("-")[0] + "-" + str(i)
centroids = np.array([obj["centroid"] for obj in new_objects_list])
distances = self.calculate_box_distances(new_objects_list)
return new_objects_list, distances
@staticmethod
def ignore_large_boxes(object_list):
"""
filtering boxes which are biger than the 1/4 of the size the image
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: input object list without large boxes
"""
large_boxes = []
for i in range(len(object_list)):
if (object_list[i]["centroid"][2] * object_list[i]["centroid"][3]) > 0.25:
large_boxes.append(i)
updated_object_list = [j for i, j in enumerate(object_list) if i not in large_boxes]
return updated_object_list
@staticmethod
def non_max_suppression_fast(object_list, overlapThresh):
"""
omitting duplicated boxes by applying an auxilary non-maximum-suppression.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
overlapThresh: threshold of minimum IoU of to detect two box as duplicated.
returns:
object_list: input object list without duplicated boxes
"""
# if there are no boxes, return an empty list
boxes = np.array([item["centroid"] for item in object_list])
corners = np.array([item["bbox"] for item in object_list])
if len(boxes) == 0:
return []
if boxes.dtype.kind == "i":
boxes = boxes.astype("float")
# initialize the list of picked indexes
pick = []
cy = boxes[:, 1]
cx = boxes[:, 0]
h = boxes[:, 3]
w = boxes[:, 2]
x1 = corners[:, 0]
x2 = corners[:, 2]
y1 = corners[:, 1]
y2 = corners[:, 3]
area = (h + 1) * (w + 1)
idxs = np.argsort(cy + (h / 2))
while len(idxs) > 0:
last = len(idxs) - 1
i = idxs[last]
pick.append(i)
xx1 = np.maximum(x1[i], x1[idxs[:last]])
yy1 = np.maximum(y1[i], y1[idxs[:last]])
xx2 = np.minimum(x2[i], x2[idxs[:last]])
yy2 = np.minimum(y2[i], y2[idxs[:last]])
w = np.maximum(0, xx2 - xx1 + 1)
h = np.maximum(0, yy2 - yy1 + 1)
# compute the ratio of overlap
overlap = (w * h) / area[idxs[:last]]
# delete all indexes from the index list that have
idxs = np.delete(idxs, np.concatenate(([last],
np.where(overlap > overlapThresh)[0])))
updated_object_list = [j for i, j in enumerate(object_list) if i in pick]
return updated_object_list
def calculate_distance_of_two_points_of_boxes(self, first_point, second_point):
"""
This function calculates a distance l for two input corresponding points of two detected bounding boxes.
it is assumed that each person is H = 170 cm tall in real scene to map the distances in the image (in pixels) to
physical distance measures (in meters).
params:
first_point: (x, y, h)-tuple, where x,y is the location of a point (center or each of 4 corners of a bounding box)
and h is the height of the bounding box.
second_point: same tuple as first_point for the corresponding point of other box
returns:
l: Estimated physical distance (in centimeters) between first_point and second_point.
"""
# estimate corresponding points distance
[xc1, yc1, h1] = first_point
[xc2, yc2, h2] = second_point
dx = xc2 - xc1
dy = yc2 - yc1
lx = dx * 170 * (1 / h1 + 1 / h2) / 2
ly = dy * 170 * (1 / h1 + 1 / h2) / 2
l = math.sqrt(lx ** 2 + ly ** 2)
return l
def calculate_box_distances(self, nn_out):
"""
This function calculates a distance matrix for detected bounding boxes.
Two methods are implemented to calculate the distances, first one estimates distance of center points of the
boxes and second one uses minimum distance of each of 4 points of bounding boxes.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroidReal" (a tuple of the centroid coordinates (cx,cy,w,h) of the box) and "bboxReal" (a tuple
of the (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
distances: a NxN ndarray which i,j element is estimated distance between i-th and j-th bounding box in real scene (cm)
"""
distances = []
for i in range(len(nn_out)):
distance_row = []
for j in range(len(nn_out)):
if i == j:
l = 0
else:
if (self.dist_method == 'FourCornerPointsDistance'):
lower_left_of_first_box = [nn_out[i]["bboxReal"][0], nn_out[i]["bboxReal"][1],
nn_out[i]["centroidReal"][3]]
lower_right_of_first_box = [nn_out[i]["bboxReal"][2], nn_out[i]["bboxReal"][1],
nn_out[i]["centroidReal"][3]]
upper_left_of_first_box = [nn_out[i]["bboxReal"][0], nn_out[i]["bboxReal"][3],
nn_out[i]["centroidReal"][3]]
upper_right_of_first_box = [nn_out[i]["bboxReal"][2], nn_out[i]["bboxReal"][3],
nn_out[i]["centroidReal"][3]]
lower_left_of_second_box = [nn_out[j]["bboxReal"][0], nn_out[j]["bboxReal"][1],
nn_out[j]["centroidReal"][3]]
lower_right_of_second_box = [nn_out[j]["bboxReal"][2], nn_out[j]["bboxReal"][1],
nn_out[j]["centroidReal"][3]]
upper_left_of_second_box = [nn_out[j]["bboxReal"][0], nn_out[j]["bboxReal"][3],
nn_out[j]["centroidReal"][3]]
upper_right_of_second_box = [nn_out[j]["bboxReal"][2], nn_out[j]["bboxReal"][3],
nn_out[j]["centroidReal"][3]]
l1 = self.calculate_distance_of_two_points_of_boxes(lower_left_of_first_box,
lower_left_of_second_box)
l2 = self.calculate_distance_of_two_points_of_boxes(lower_right_of_first_box,
lower_right_of_second_box)
l3 = self.calculate_distance_of_two_points_of_boxes(upper_left_of_first_box,
upper_left_of_second_box)
l4 = self.calculate_distance_of_two_points_of_boxes(upper_right_of_first_box,
upper_right_of_second_box)
l = min(l1, l2, l3, l4)
elif (self.dist_method == 'CenterPointsDistance'):
center_of_first_box = [nn_out[i]["centroidReal"][0], nn_out[i]["centroidReal"][1],
nn_out[i]["centroidReal"][3]]
center_of_second_box = [nn_out[j]["centroidReal"][0], nn_out[j]["centroidReal"][1],
nn_out[j]["centroidReal"][3]]
l = self.calculate_distance_of_two_points_of_boxes(center_of_first_box, center_of_second_box)
distance_row.append(l)
distances.append(distance_row)
distances_asarray = np.asarray(distances, dtype=np.float32)
return distances_asarray
class Distancing:
def __init__(self, config):
self.config = config
self.ui = None
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.running_video = False
self.tracker = CentroidTracker(max_disappeared=int(
self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.logger = Logger(self.config)
if self.device == 'Jetson':
from libs.detectors.jetson.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'EdgeTPU':
from libs.detectors.edgetpu.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'Dummy':
self.detector = None
self.image_size = [
int(i) for i in self.config.get_section_dict('Detector')
['ImageSize'].split(',')
]
if self.device != 'Dummy':
print('Device is: ', self.device)
print('Detector is: ', self.detector.name)
print('image size: ', self.image_size)
def set_ui(self, ui):
self.ui = ui
def __process(self, cv_image):
"""
return object_list list of dict for each obj,
obj["bbox"] is normalized coordinations for [x0, y0, x1, y1] of box
"""
if self.device == 'Dummy':
return cv_image, [], None
# Resize input image to resolution
resolution = [
int(i) for i in self.config.get_section_dict('App')
['Resolution'].split(',')
]
cv_image = cv.resize(cv_image, tuple(resolution))
resized_image = cv.resize(cv_image, tuple(self.image_size[:2]))
rgb_resized_image = cv.cvtColor(resized_image, cv.COLOR_BGR2RGB)
tmp_objects_list = self.detector.inference(rgb_resized_image)
for obj in tmp_objects_list:
box = obj["bbox"]
x0 = box[1]
y0 = box[0]
x1 = box[3]
y1 = box[2]
obj["centroid"] = [(x0 + x1) / 2, (y0 + y1) / 2, x1 - x0, y1 - y0]
obj["bbox"] = [x0, y0, x1, y1]
objects_list, distancings = self.calculate_distancing(tmp_objects_list)
return cv_image, objects_list, distancings
def process_video(self, video_uri):
input_cap = cv.VideoCapture(video_uri)
if (input_cap.isOpened()):
print('opened video ', video_uri)
else:
print('failed to load video ', video_uri)
return
self.running_video = True
while input_cap.isOpened() and self.running_video:
_, cv_image = input_cap.read()
cv_image, objects, distancings = self.__process(cv_image)
self.logger.update(objects, distancings)
self.ui.update(cv_image, objects, distancings)
input_cap.release()
self.running_video = False
def process_image(self, image_path):
# Process and pass the image to ui modules
cv_image = cv.imread(image_path)
cv_image, objects, distancings = self.__process(cv_image)
self.ui.update(cv_image, objects, distancings)
def calculate_distancing(self, objects_list):
"""
this function post-process the raw boxes of object detector and calculate a distance matrix
for detected bounding boxes.
post processing is consist of:
1. omitting large boxes by filtering boxes which are biger than the 1/4 of the size the image.
2. omitting duplicated boxes by applying an auxilary non-maximum-suppression.
3. apply a simple object tracker to make the detection more robust.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: the post processed version of the input
distances: a NxN ndarray which i,j element is distance between i-th and l-th bounding box
"""
new_objects_list = self.ignore_large_boxes(objects_list)
new_objects_list = self.non_max_suppression_fast(
new_objects_list,
float(
self.config.get_section_dict("PostProcessor")["NMSThreshold"]))
tracked_boxes = self.tracker.update(new_objects_list)
new_objects_list = [tracked_boxes[i] for i in tracked_boxes.keys()]
for i, item in enumerate(new_objects_list):
item["id"] = item["id"].split("-")[0] + "-" + str(i)
centroids = np.array([obj["centroid"] for obj in new_objects_list])
distances = dist.cdist(centroids, centroids)
return new_objects_list, distances
@staticmethod
def ignore_large_boxes(object_list):
"""
filtering boxes which are biger than the 1/4 of the size the image
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: input object list without large boxes
"""
large_boxes = []
for i in range(len(object_list)):
if (object_list[i]["centroid"][2] *
object_list[i]["centroid"][3]) > 0.25:
large_boxes.append(i)
updated_object_list = [
j for i, j in enumerate(object_list) if i not in large_boxes
]
return updated_object_list
@staticmethod
def non_max_suppression_fast(object_list, overlapThresh):
"""
omitting duplicated boxes by applying an auxilary non-maximum-suppression.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
overlapThresh: threshold of minimum IoU of to detect two box as duplicated.
returns:
object_list: input object list without duplicated boxes
"""
# if there are no boxes, return an empty list
boxes = np.array([item["centroid"] for item in object_list])
corners = np.array([item["bbox"] for item in object_list])
if len(boxes) == 0:
return []
if boxes.dtype.kind == "i":
boxes = boxes.astype("float")
# initialize the list of picked indexes
pick = []
cy = boxes[:, 1]
cx = boxes[:, 0]
h = boxes[:, 3]
w = boxes[:, 2]
x1 = corners[:, 0]
x2 = corners[:, 2]
y1 = corners[:, 1]
y2 = corners[:, 3]
area = (h + 1) * (w + 1)
idxs = np.argsort(cy + (h / 2))
while len(idxs) > 0:
last = len(idxs) - 1
i = idxs[last]
pick.append(i)
xx1 = np.maximum(x1[i], x1[idxs[:last]])
yy1 = np.maximum(y1[i], y1[idxs[:last]])
xx2 = np.minimum(x2[i], x2[idxs[:last]])
yy2 = np.minimum(y2[i], y2[idxs[:last]])
w = np.maximum(0, xx2 - xx1 + 1)
h = np.maximum(0, yy2 - yy1 + 1)
# compute the ratio of overlap
overlap = (w * h) / area[idxs[:last]]
# delete all indexes from the index list that have
idxs = np.delete(
idxs,
np.concatenate(([last], np.where(overlap > overlapThresh)[0])))
updated_object_list = [
j for i, j in enumerate(object_list) if i in pick
]
return updated_object_list
class Distancing:
def __init__(self, config, source, live_feed_enabled=True):
self.config = config
self.detector = None
self.device = self.config.get_section_dict('Detector')['Device']
self.live_feed_enabled = live_feed_enabled
self.log_time_interval = float(self.config.get_section_dict("Logger")["TimeInterval"]) # Seconds
self.classifier = None
self.classifier_img_size = None
self.face_mask_classifier = None
self.running_video = False
self.tracker = CentroidTracker(
max_disappeared=int(self.config.get_section_dict("PostProcessor")["MaxTrackFrame"]))
self.camera_id = self.config.get_section_dict(source)['Id']
self.logger = Logger(self.config, self.camera_id)
self.image_size = [int(i) for i in self.config.get_section_dict('Detector')['ImageSize'].split(',')]
self.default_dist_method = self.config.get_section_dict('PostProcessor')["DefaultDistMethod"]
if self.config.get_section_dict(source)["DistMethod"]:
self.dist_method = self.config.get_section_dict(source)["DistMethod"]
else:
self.dist_method = self.default_dist_method
self.dist_threshold = self.config.get_section_dict("PostProcessor")["DistThreshold"]
self.resolution = tuple([int(i) for i in self.config.get_section_dict('App')['Resolution'].split(',')])
self.birds_eye_resolution = (200, 300)
if self.dist_method == "CalibratedDistance":
calibration_file = get_camera_calibration_path(
self.config, self.config.get_section_dict(source)["Id"])
try:
with open(calibration_file, "r") as file:
self.h_inv = file.readlines()[0].split(" ")[1:]
self.h_inv = np.array(self.h_inv, dtype="float").reshape((3, 3))
except FileNotFoundError:
logger.error("The specified 'CalibrationFile' does not exist")
logger.info(f"Falling back using {self.default_dist_method}")
self.dist_method = self.default_dist_method
# config.ini uses minutes as unit
self.screenshot_period = float(self.config.get_section_dict("App")["ScreenshotPeriod"]) * 60
self.bucket_screenshots = config.get_section_dict("App")["ScreenshotS3Bucket"]
self.uploader = S3Uploader(self.config)
self.screenshot_path = os.path.join(self.config.get_section_dict("App")["ScreenshotsDirectory"], self.camera_id)
if not os.path.exists(self.screenshot_path):
os.makedirs(self.screenshot_path)
if "Classifier" in self.config.get_sections():
self.face_threshold = float(self.config.get_section_dict("Classifier").get("MinScore", 0.75))
def __process(self, cv_image):
"""
return object_list list of dict for each obj,
obj["bbox"] is normalized coordinations for [x0, y0, x1, y1] of box
"""
# Resize input image to resolution
cv_image = cv.resize(cv_image, self.resolution)
resized_image = cv.resize(cv_image, tuple(self.image_size[:2]))
rgb_resized_image = cv.cvtColor(resized_image, cv.COLOR_BGR2RGB)
tmp_objects_list = self.detector.inference(rgb_resized_image)
# Get the classifier result for detected face
if self.classifier is not None:
faces = []
for itm in tmp_objects_list:
if 'face' in itm.keys():
face_bbox = itm['face'] # [ymin, xmin, ymax, xmax]
if face_bbox is not None:
xmin, xmax = np.multiply([face_bbox[1], face_bbox[3]], self.resolution[0])
ymin, ymax = np.multiply([face_bbox[0], face_bbox[2]], self.resolution[1])
croped_face = cv_image[
int(ymin):int(ymin) + (int(ymax) - int(ymin)),
int(xmin):int(xmin) + (int(xmax) - int(xmin))
]
# Resizing input image
croped_face = cv.resize(croped_face, tuple(self.classifier_img_size[:2]))
croped_face = cv.cvtColor(croped_face, cv.COLOR_BGR2RGB)
# Normalizing input image to [0.0-1.0]
croped_face = np.array(croped_face) / 255.0
faces.append(croped_face)
faces = np.array(faces)
face_mask_results, scores = self.classifier.inference(faces)
[w, h] = self.resolution
idx = 0
for obj in tmp_objects_list:
if self.classifier is not None and 'face' in obj.keys():
if obj['face'] is not None and scores[idx] > self.face_threshold:
obj['face_label'] = face_mask_results[idx]
idx = idx + 1
else:
obj['face_label'] = -1
box = obj["bbox"]
x0 = box[1]
y0 = box[0]
x1 = box[3]
y1 = box[2]
obj["centroid"] = [(x0 + x1) / 2, (y0 + y1) / 2, x1 - x0, y1 - y0]
obj["bbox"] = [x0, y0, x1, y1]
obj["centroidReal"] = [(x0 + x1) * w / 2, (y0 + y1) * h / 2, (x1 - x0) * w, (y1 - y0) * h]
obj["bboxReal"] = [x0 * w, y0 * h, x1 * w, y1 * h]
objects_list, distancings = self.calculate_distancing(tmp_objects_list)
anonymize = self.config.get_section_dict('PostProcessor')['Anonymize'] == "true"
if anonymize:
cv_image = self.anonymize_image(cv_image, objects_list)
return cv_image, objects_list, distancings
def gstreamer_writer(self, feed_name, fps, resolution):
"""
This method creates and returns an OpenCV Video Writer instance. The VideoWriter expects its `.write()` method
to be called with a single frame image multiple times. It encodes frames into live video segments and produces
a video segment once it has received enough frames to produce a 5-seconds segment of live video.
The video segments are written on the filesystem. The target directory for writing segments is determined by
`video_root` variable. In addition to writing the video segments, the VideoWriter also updates a file named
playlist.m3u8 in the target directory. This file contains the list of generated video segments and is updated
automatically.
This instance does not serve these video segments to the client. It is expected that the target video directory
is being served by a static file server and the clientside HLS video library downloads "playlist.m3u8". Then,
the client video player reads the link for video segments, according to HLS protocol, and downloads them from
static file server.
:param feed_name: Is the name for video feed. We may have multiple cameras, each with multiple video feeds (e.g. one
feed for visualizing bounding boxes and one for bird's eye view). Each video feed should be written into a
separate directory. The name for target directory is defined by this variable.
:param fps: The HLS video player on client side needs to know how many frames should be shown to the user per
second. This parameter is independent from the frame rate with which the video is being processed. For example,
if we set fps=60, but produce only frames (by calling `.write()`) per second, the client will see a loading
indicator for 5*60/30 seconds and then 5 seconds of video is played with fps 60.
:param resolution: A tuple of size 2 which indicates the resolution of output video.
"""
encoder = self.config.get_section_dict('App')['Encoder']
video_root = f'/repo/data/processor/static/gstreamer/{feed_name}'
shutil.rmtree(video_root, ignore_errors=True)
os.makedirs(video_root, exist_ok=True)
playlist_root = f'/static/gstreamer/{feed_name}'
if not playlist_root.endswith('/'):
playlist_root = f'{playlist_root}/'
# the entire encoding pipeline, as a string:
pipeline = f'appsrc is-live=true ! {encoder} ! mpegtsmux ! hlssink max-files=15 ' \
f'target-duration=5 ' \
f'playlist-root={playlist_root} ' \
f'location={video_root}/video_%05d.ts ' \
f'playlist-location={video_root}/playlist.m3u8 '
out = cv.VideoWriter(
pipeline,
cv.CAP_GSTREAMER,
0, fps, resolution
)
if not out.isOpened():
raise RuntimeError("Could not open gstreamer output for " + feed_name)
return out
def process_live_feed(self, cv_image, objects, distancings, violating_objects, out, out_birdseye):
dist_threshold = float(self.config.get_section_dict("PostProcessor")["DistThreshold"])
birds_eye_window = np.zeros(self.birds_eye_resolution[::-1] + (3,), dtype="uint8")
class_id = int(self.config.get_section_dict('Detector')['ClassID'])
output_dict = visualization_utils.visualization_preparation(objects, distancings, dist_threshold)
category_index = {class_id: {
"id": class_id,
"name": "Pedestrian",
}} # TODO: json file for detector config
face_index = {
0: "YES",
1: "NO",
-1: "N/A",
}
# Draw bounding boxes and other visualization factors on input_frame
visualization_utils.visualize_boxes_and_labels_on_image_array(
cv_image,
output_dict["detection_boxes"],
output_dict["detection_classes"],
output_dict["detection_scores"],
output_dict["detection_colors"],
category_index,
instance_masks=output_dict.get("detection_masks"),
use_normalized_coordinates=True,
line_thickness=3,
face_labels=output_dict["face_labels"],
face_index=face_index
)
# TODO: Implement perspective view for objects
birds_eye_window = visualization_utils.birds_eye_view(
birds_eye_window, output_dict["detection_boxes"], output_dict["violating_objects"])
try:
fps = self.detector.fps
except:
# fps is not implemented for the detector instance"
fps = None
# Put fps to the frame
# region
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
txt_fps = 'Frames rate = ' + str(fps) + '(fps)' # Frames rate = 95 (fps)
# (0, 0) is the top-left (x,y); normalized number between 0-1
origin = (0.05, 0.93)
visualization_utils.text_putter(cv_image, txt_fps, origin)
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
# endregion
# Put environment score to the frame
# region
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
env_score = mx_environment_scoring_consider_crowd(len(objects), len(violating_objects))
txt_env_score = 'Env Score = ' + str(env_score) # Env Score = 0.7
origin = (0.05, 0.98)
visualization_utils.text_putter(cv_image, txt_env_score, origin)
# -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_- -_-
# endregion
out.write(cv_image)
out_birdseye.write(birds_eye_window)
def process_video(self, video_uri):
if self.device == 'Jetson':
from libs.detectors.jetson.detector import Detector
self.detector = Detector(self.config)
elif self.device == 'EdgeTPU':
from libs.detectors.edgetpu.detector import Detector
from libs.classifiers.edgetpu.classifier import Classifier
self.detector = Detector(self.config)
if "Classifier" in self.config.get_sections():
self.classifier = Classifier(self.config)
self.classifier_img_size = [int(i) for i in
self.config.get_section_dict("Classifier")["ImageSize"].split(",")]
elif self.device == 'Dummy':
from libs.detectors.dummy.detector import Detector
self.detector = Detector(self.config)
elif self.device in ['x86', 'x86-gpu']:
from libs.detectors.x86.detector import Detector
from libs.classifiers.x86.classifier import Classifier
self.detector = Detector(self.config)
if "Classifier" in self.config.get_sections():
self.classifier = Classifier(self.config)
self.classifier_img_size = [int(i) for i in
self.config.get_section_dict("Classifier")["ImageSize"].split(",")]
if self.device != 'Dummy':
print('Device is: ', self.device)
print('Detector is: ', self.detector.name)
print('image size: ', self.image_size)
input_cap = cv.VideoCapture(video_uri)
fps = max(25, input_cap.get(cv.CAP_PROP_FPS))
if (input_cap.isOpened()):
logger.info(f'opened video {video_uri}')
else:
logger.error(f'failed to load video {video_uri}')
return
self.running_video = True
# enable logging gstreamer Errors (https://stackoverflow.com/questions/3298934/how-do-i-view-gstreamer-debug-output)
os.environ['GST_DEBUG'] = "*:1"
if self.live_feed_enabled:
out, out_birdseye = (
self.gstreamer_writer(feed, fps, resolution)
for (feed, resolution) in (
(self.camera_id, self.resolution),
(self.camera_id + '-birdseye', self.birds_eye_resolution)
)
)
dist_threshold = float(self.config.get_section_dict("PostProcessor")["DistThreshold"])
frame_num = 0
start_time = time.time()
last_processed_time = time.time()
while input_cap.isOpened() and self.running_video:
_, cv_image = input_cap.read()
if np.shape(cv_image) != ():
if not self.live_feed_enabled and (time.time() - last_processed_time < self.log_time_interval):
continue
cv_image, objects, distancings = self.__process(cv_image)
violating_objects = extract_violating_objects(distancings, dist_threshold)
if self.live_feed_enabled:
self.process_live_feed(cv_image, objects, distancings, violating_objects, out, out_birdseye)
last_processed_time = time.time()
frame_num += 1
if frame_num % 100 == 1:
logger.info(f'processed frame {frame_num} for {video_uri}')
# Save a screenshot only if the period is greater than 0, a violation is detected, and the minimum period
# has occured
if (self.screenshot_period > 0) and (time.time() > start_time + self.screenshot_period) and (
len(violating_objects) > 0):
start_time = time.time()
self.capture_violation(f"{start_time}_violation.jpg", cv_image)
self.save_screenshot(cv_image)
else:
continue
self.logger.update(objects, distancings)
input_cap.release()
if self.live_feed_enabled:
out.release()
out_birdseye.release()
del self.detector
self.running_video = False
def stop_process_video(self):
self.running_video = False
def calculate_distancing(self, objects_list):
"""
this function post-process the raw boxes of object detector and calculate a distance matrix
for detected bounding boxes.
post processing is consist of:
1. omitting large boxes by filtering boxes which are bigger than the 1/4 of the size the image.
2. omitting duplicated boxes by applying an auxilary non-maximum-suppression.
3. apply a simple object tracker to make the detection more robust.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: the post processed version of the input
distances: a NxN ndarray which i,j element is distance between i-th and l-th bounding box
"""
new_objects_list = self.ignore_large_boxes(objects_list)
new_objects_list = self.non_max_suppression_fast(new_objects_list,
float(self.config.get_section_dict("PostProcessor")[
"NMSThreshold"]))
tracked_boxes = self.tracker.update(new_objects_list)
new_objects_list = [tracked_boxes[i] for i in tracked_boxes.keys()]
for i, item in enumerate(new_objects_list):
item["id"] = item["id"].split("-")[0] + "-" + str(i)
distances = self.calculate_box_distances(new_objects_list)
return new_objects_list, distances
@staticmethod
def ignore_large_boxes(object_list):
"""
filtering boxes which are biger than the 1/4 of the size the image
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
object_list: input object list without large boxes
"""
large_boxes = []
for i in range(len(object_list)):
if (object_list[i]["centroid"][2] * object_list[i]["centroid"][3]) > 0.25:
large_boxes.append(i)
updated_object_list = [j for i, j in enumerate(object_list) if i not in large_boxes]
return updated_object_list
@staticmethod
def non_max_suppression_fast(object_list, overlapThresh):
"""
omitting duplicated boxes by applying an auxilary non-maximum-suppression.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such
"id", "centroid" (a tuple of the normalized centroid coordinates (cx,cy,w,h) of the box) and "bbox" (a tuple
of the normalized (xmin,ymin,xmax,ymax) coordinate of the box)
overlapThresh: threshold of minimum IoU of to detect two box as duplicated.
returns:
object_list: input object list without duplicated boxes
"""
# if there are no boxes, return an empty list
boxes = np.array([item["centroid"] for item in object_list])
corners = np.array([item["bbox"] for item in object_list])
if len(boxes) == 0:
return []
if boxes.dtype.kind == "i":
boxes = boxes.astype("float")
# initialize the list of picked indexes
pick = []
cy = boxes[:, 1]
cx = boxes[:, 0]
h = boxes[:, 3]
w = boxes[:, 2]
x1 = corners[:, 0]
x2 = corners[:, 2]
y1 = corners[:, 1]
y2 = corners[:, 3]
area = (h + 1) * (w + 1)
idxs = np.argsort(cy + (h / 2))
while len(idxs) > 0:
last = len(idxs) - 1
i = idxs[last]
pick.append(i)
xx1 = np.maximum(x1[i], x1[idxs[:last]])
yy1 = np.maximum(y1[i], y1[idxs[:last]])
xx2 = np.minimum(x2[i], x2[idxs[:last]])
yy2 = np.minimum(y2[i], y2[idxs[:last]])
w = np.maximum(0, xx2 - xx1 + 1)
h = np.maximum(0, yy2 - yy1 + 1)
# compute the ratio of overlap
overlap = (w * h) / area[idxs[:last]]
# delete all indexes from the index list that have
idxs = np.delete(idxs, np.concatenate(([last],
np.where(overlap > overlapThresh)[0])))
updated_object_list = [j for i, j in enumerate(object_list) if i in pick]
return updated_object_list
def calculate_distance_of_two_points_of_boxes(self, first_point, second_point):
"""
This function calculates a distance l for two input corresponding points of two detected bounding boxes.
it is assumed that each person is H = 170 cm tall in real scene to map the distances in the image (in pixels) to
physical distance measures (in meters).
params:
first_point: (x, y, h)-tuple, where x,y is the location of a point (center or each of 4 corners of a bounding box)
and h is the height of the bounding box.
second_point: same tuple as first_point for the corresponding point of other box
returns:
l: Estimated physical distance (in centimeters) between first_point and second_point.
"""
# estimate corresponding points distance
[xc1, yc1, h1] = first_point
[xc2, yc2, h2] = second_point
dx = xc2 - xc1
dy = yc2 - yc1
lx = dx * 170 * (1 / h1 + 1 / h2) / 2
ly = dy * 170 * (1 / h1 + 1 / h2) / 2
l = math.sqrt(lx ** 2 + ly ** 2)
return l
def calculate_box_distances(self, nn_out):
"""
This function calculates a distance matrix for detected bounding boxes.
Three methods are implemented to calculate the distances, the first one estimates distance with a calibration matrix
which transform the points to the 3-d world coordinate, the second one estimates distance of center points of the
boxes and the third one uses minimum distance of each of 4 points of bounding boxes.
params:
object_list: a list of dictionaries. each dictionary has attributes of a detected object such as
"id", "centroidReal" (a tuple of the centroid coordinates (cx,cy,w,h) of the box) and "bboxReal" (a tuple
of the (xmin,ymin,xmax,ymax) coordinate of the box)
returns:
distances: a NxN ndarray which i,j element is estimated distance between i-th and j-th bounding box in real scene (cm)
"""
if self.dist_method == "CalibratedDistance":
world_coordinate_points = np.array([self.transform_to_world_coordinate(bbox) for bbox in nn_out])
if len(world_coordinate_points) == 0:
distances_asarray = np.array([])
else:
distances_asarray = cdist(world_coordinate_points, world_coordinate_points)
else:
distances = []
for i in range(len(nn_out)):
distance_row = []
for j in range(len(nn_out)):
if i == j:
l = 0
else:
if (self.dist_method == 'FourCornerPointsDistance'):
lower_left_of_first_box = [nn_out[i]["bboxReal"][0], nn_out[i]["bboxReal"][1],
nn_out[i]["centroidReal"][3]]
lower_right_of_first_box = [nn_out[i]["bboxReal"][2], nn_out[i]["bboxReal"][1],
nn_out[i]["centroidReal"][3]]
upper_left_of_first_box = [nn_out[i]["bboxReal"][0], nn_out[i]["bboxReal"][3],
nn_out[i]["centroidReal"][3]]
upper_right_of_first_box = [nn_out[i]["bboxReal"][2], nn_out[i]["bboxReal"][3],
nn_out[i]["centroidReal"][3]]
lower_left_of_second_box = [nn_out[j]["bboxReal"][0], nn_out[j]["bboxReal"][1],
nn_out[j]["centroidReal"][3]]
lower_right_of_second_box = [nn_out[j]["bboxReal"][2], nn_out[j]["bboxReal"][1],
nn_out[j]["centroidReal"][3]]
upper_left_of_second_box = [nn_out[j]["bboxReal"][0], nn_out[j]["bboxReal"][3],
nn_out[j]["centroidReal"][3]]
upper_right_of_second_box = [nn_out[j]["bboxReal"][2], nn_out[j]["bboxReal"][3],
nn_out[j]["centroidReal"][3]]
l1 = self.calculate_distance_of_two_points_of_boxes(lower_left_of_first_box,
lower_left_of_second_box)
l2 = self.calculate_distance_of_two_points_of_boxes(lower_right_of_first_box,
lower_right_of_second_box)
l3 = self.calculate_distance_of_two_points_of_boxes(upper_left_of_first_box,
upper_left_of_second_box)
l4 = self.calculate_distance_of_two_points_of_boxes(upper_right_of_first_box,
upper_right_of_second_box)
l = min(l1, l2, l3, l4)
elif (self.dist_method == 'CenterPointsDistance'):
center_of_first_box = [nn_out[i]["centroidReal"][0], nn_out[i]["centroidReal"][1],
nn_out[i]["centroidReal"][3]]
center_of_second_box = [nn_out[j]["centroidReal"][0], nn_out[j]["centroidReal"][1],
nn_out[j]["centroidReal"][3]]
l = self.calculate_distance_of_two_points_of_boxes(center_of_first_box,
center_of_second_box)
distance_row.append(l)
distances.append(distance_row)
distances_asarray = np.asarray(distances, dtype=np.float32)
return distances_asarray
def transform_to_world_coordinate(self, bbox):
"""
This function will transform the center of the bottom line of a bounding box from image coordinate to world
coordinate via a homography matrix
Args:
bbox: a dictionary of a coordinates of a detected instance with "id",
"centroidReal" (a tuple of the centroid coordinates (cx,cy,w,h) of the box) and "bboxReal" (a tuple
of the (xmin,ymin,xmax,ymax) coordinate of the box) keys
Returns:
A numpy array of (X,Y) of transformed point
"""
floor_point = np.array([int((bbox["bboxReal"][0] + bbox["bboxReal"][2]) / 2), bbox["bboxReal"][3], 1])
floor_world_point = np.matmul(self.h_inv, floor_point)
floor_world_point = floor_world_point[:-1] / floor_world_point[-1]
return floor_world_point
def anonymize_image(self, img, objects_list):
"""
Anonymize every instance in the frame.
"""
h, w = img.shape[:2]
for box in objects_list:
xmin = max(int(box["bboxReal"][0]), 0)
xmax = min(int(box["bboxReal"][2]), w)
ymin = max(int(box["bboxReal"][1]), 0)
ymax = min(int(box["bboxReal"][3]), h)
ymax = (ymax - ymin) // 3 + ymin
roi = img[ymin:ymax, xmin:xmax]
roi = self.anonymize_face(roi)
img[ymin:ymax, xmin:xmax] = roi
return img
@staticmethod
def anonymize_face(image):
"""
Blur an image to anonymize the person's faces.
"""
(h, w) = image.shape[:2]
kernel_w = int(w / 3)
kernel_h = int(h / 3)
if kernel_w % 2 == 0:
kernel_w = max(1, kernel_w - 1)
if kernel_h % 2 == 0:
kernel_h = max(1, kernel_h - 1)
return cv.GaussianBlur(image, (kernel_w, kernel_h), 0)
# TODO: Make this an async task?
def capture_violation(self, file_name, cv_image):
self.uploader.upload_cv_image(self.bucket_screenshots, cv_image, file_name, self.camera_id)
def save_screenshot(self, cv_image):
dir_path = f'{self.screenshot_path}/default.jpg'
if not os.path.exists(dir_path):
logger.info(f"Saving default screenshot for {self.camera_id}")
cv.imwrite(f'{self.screenshot_path}/default.jpg', cv_image)