def get_transform(self, image, annotations):
invert_region = []
for anno_idx, anno in enumerate(annotations):
do = rand_by_rate(self.prob[anno["category_id"]])
if do:
side_w_do = rand_by_rate(self.side_rate_w)
side_h_do = rand_by_rate(self.side_rate_h)
bbox = copy.deepcopy(anno["bbox"])
box_w = bbox[2] - bbox[0]
box_h = bbox[3] - bbox[1]
#pick a region along width
if side_w_do:
bbox[0] = bbox[0] + box_w * random.uniform(
0, self.left_side_upper_bound)
bbox[2] = bbox[2] - box_w * (
1 - random.uniform(self.right_side_lower_bound, 1))
#pick a region along height
if side_h_do:
bbox[1] = bbox[1] + box_h * random.uniform(
0, self.left_side_upper_bound)
bbox[3] = bbox[3] - box_h * (
1 - random.uniform(self.right_side_lower_bound, 1))
bbox = list(map(int, bbox))
invert_region.append(bbox)
if len(invert_region) == 0:
return NoOpTransform()
else:
return BoxContrastTransform(invert_region)
def get_transform(self, image, annotations):
fill_region = []
for anno in annotations:
do = rand_by_rate(self.prob)
if do:
bbox = anno["bbox"]
#assert(bbox[0]<bbox[2] and bbox[1]<bbox[3])
#compute a region to fill
box_w = bbox[2] - bbox[0]
box_h = bbox[3] - bbox[1]
if box_w < 20 or box_h < 20:
continue
region_box = []
region_w = random.randint(1, box_w // 2)
region_h = random.randint(1, box_h // 2)
region_left = random.randint(1, box_w // 2)
region_top = random.randint(1, box_h // 2)
region_box.append(region_left + bbox[0])
region_box.append(region_top + bbox[1])
region_box.append(region_left + bbox[0] + region_w)
region_box.append(region_top + bbox[1] + region_h)
region_box = list(map(int, region_box))
fill_region.append(region_box)
if len(fill_region) == 0:
return NoOpTransform()
else:
return BoxEraseTransform(fill_region)
def get_transform(self, image, annotations):
mosaic_direction = []
for i in range(self.max_move):
do = rand_by_rate(self.prob)
if not do:
continue
#mosaic to right or bottom
mosaic_right = rand_by_rate(0.5)
if mosaic_right:
mosaic_direction.append("right")
else:
mosaic_direction.append("bottom")
if len(mosaic_direction) == 0:
return NoOpTransform()
else:
return MosaicTransform(mosaic_direction, annotations)
def get_transform(self, image):
do = rand_by_rate(self.prob)
if do:
rate = random.uniform(self.min_rate, self.max_rate)
return NoiseTransform(rate)
else:
return NoOpTransform()
def get_transform(self, image):
do = rand_by_rate(self.prob)
if do:
h, w = image.shape[:2]
dst_w, dst_h = adjust_scale(
(w, h), self.min_ratio, self.max_ratio, self.balanced_point,
self.balanced_transform, self.keep_same_size)
return ResizeTransform(h, w, dst_h, dst_w)
else:
return NoOpTransform()
def get_transform(self, image, annotations):
img_h, img_w = image.shape[:2]
move_info = [] # anno_id:[]
moved_once = False
for idx, anno in enumerate(annotations):
anno_trans_info = {}
anno_trans_info["anno_id"] = idx
# some classes dont need to move
if self.prob[anno["category_id"]] == 0:
continue
just_remove_it = rand_by_rate(self.remove_rate)
anno_move_info = []
for _ in range(self.max_move):
do = rand_by_rate(self.prob[anno["category_id"]])
if not do:
continue
moved_once = True
single_move_info = {}
single_move_info["raw_box_coor"] = anno["bbox"]
# set rescale ratio
box_w = int(anno["bbox"][2] - anno["bbox"][0])
box_h = int(anno["bbox"][3] - anno["bbox"][1])
dst_size = adjust_scale((box_w, box_h), self.min_move_rescale,
self.max_move_rescale,
self.balanced_point,
self.balanced_transform, True)
dst_size[0] = min(dst_size[0], img_w)
dst_size[1] = min(dst_size[1], img_h)
single_move_info["dst_size"] = dst_size
# start move process
mv_side = rand_by_rate(self.side_rate)
#move to side
to_paste_point = [-1, -1] # left top
if mv_side:
if rand_by_rate(0.5): #top
to_paste_point[0] = max(
0, anno["bbox"][0] - (dst_size[0] - box_w) / 2)
to_paste_point[1] = max(0,
anno["bbox"][1] - dst_size[1])
else: #bottom
to_paste_point[0] = max(
0, anno["bbox"][0] - (dst_size[0] - box_w) / 2)
to_paste_point[1] = min(anno["bbox"][3],
img_h - dst_size[1])
#move to anywhere
else:
to_paste_point = get_paste_point((img_w, img_h), dst_size)
single_move_info["to_paste_point"] = to_paste_point
anno_move_info.append(single_move_info)
anno_trans_info["anno_move_info"] = anno_move_info
move_info.append(anno_trans_info)
if not moved_once:
return NoOpTransform()
else:
return BoxMoveTransform(move_info)
def get_transform(self, image, annotations):
#remove some boxes
#img, boxes, labels = utils.remove_region(img, boxes, labels, min_area, max_area)
old_img_h, old_img_w = image.shape[:2]
crop_h, crop_w = self.crop_size
new_img_w = 0
new_img_h = 0
new_crop_w = 0
new_crop_h = 0
crop_left = 0
crop_top = 0
random_idx = -1 #which GT box to do attention
random_class = -1 #category of this box
categories = [anno["category_id"] for anno in annotations]
do = rand_by_rate(self.prob) and len(annotations) > 0
#compute crop width and height
if do:
if self.balance_by_cls:
#compute how many defferent classes are contained by this img
contain_classes = []
for label in categories:
if label not in contain_classes:
contain_classes.append(label)
num_classes = len(contain_classes)
assert (num_classes > 0)
#pick a class with same probility
random_idx = random.randint(0, num_classes - 1)
random_class = contain_classes[random_idx]
#pick a GT which is this class
contain_classes = []
for i, label in enumerate(categories):
if label == random_class:
contain_classes.append(i)
random_idx = contain_classes[random.randint(
0,
len(contain_classes) - 1)]
else:
random_idx = random.randint(0, len(categories) - 1)
random_class = categories[random_idx]
#select the box_resize_info param according to picked class
info_idx = 0
for i in range(len(self.box_resize_info)):
if self.box_resize_info[i]['metric_class_id'] == random_class:
info_idx = i
break
#compute crop params according to this box_resize_info
max_rescale = self.box_resize_info[info_idx]['max_rescale']
target_min_absolute_area = self.box_resize_info[info_idx][
'target_min_absolute_area']
target_max_absolute_area = self.box_resize_info[info_idx][
'target_max_absolute_area']
scale_idx = random.randint(0, len(target_min_absolute_area) - 1)
#random pick an area region
target_area = random.uniform(target_min_absolute_area[scale_idx],
target_max_absolute_area[scale_idx])
raw_area = (annotations[random_idx]["bbox"][2] -
annotations[random_idx]["bbox"][0]) * (
annotations[random_idx]["bbox"][3] -
annotations[random_idx]["bbox"][1])
#final rescale ratio
calced_rescale_ratio = target_area / raw_area
final_resize_ratio = min(max_rescale, calced_rescale_ratio)
#compute new size
new_crop_w = min(int(crop_w / math.pow(final_resize_ratio, 0.5)),
old_img_w)
new_crop_h = min(int(crop_h / math.pow(final_resize_ratio, 0.5)),
old_img_h)
else:
max_scale_rate = -1.
assert (self.largest_max_absolute_area > 0)
#compute the max box area in this img
max_box_area = -1.
for anno in annotations:
max_box_area = max(max_box_area,
(anno["bbox"][2] - anno["bbox"][0]) *
(anno["bbox"][3] - anno["bbox"][1]))
if max_box_area > 0:
max_scale_rate = pow(
self.largest_max_absolute_area / max_box_area, 0.5)
else:
return NoOpTransform()
#compute real scale size
real_min_scale = self.min_scale
real_max_scale = self.max_scale
real_min_scale = min(real_min_scale, max_scale_rate)
real_max_scale = min(real_max_scale, max_scale_rate)
if real_min_scale < self.balanced_point and real_max_scale > self.balanced_point and self.balanced_transform:
if rand_by_rate(0.5):
real_min_scale = self.balanced_point
else:
real_max_scale = self.balanced_point
final_resize_ratio = random.uniform(real_min_scale, real_max_scale)
#compute new size
new_crop_w = min(int(crop_w / math.pow(final_resize_ratio, 0.5)),
old_img_w)
new_crop_h = min(int(crop_h / math.pow(final_resize_ratio, 0.5)),
old_img_h)
#compute crop left and top
if old_img_w == new_crop_w and old_img_h == new_crop_h:
return NoOpTransform()
if do:
x_min, y_min, x_max, y_max = annotations[random_idx]["bbox"]
#left
if new_crop_w < x_max - x_min:
crop_left = x_min
else:
random_left = max(0, int(x_max - new_crop_w))
random_right = min(int(x_min), int(old_img_w - new_crop_w))
if random_left >= random_right:
return NoOpTransform()
crop_left = random.randint(random_left, random_right)
#top
if new_crop_h < y_max - y_min:
crop_top = y_min
else:
crop_top = random.randint(
max(0, int(y_max - new_crop_h)),
min(int(y_min), int(old_img_h - new_crop_h)))
else:
crop_left = random.randint(0, old_img_w - new_crop_w + 1)
crop_top = random.randint(0, old_img_h - new_crop_h + 1)
#check
if crop_left + new_crop_w > old_img_w:
crop_left = old_img_w - new_crop_w
if crop_top + new_crop_h > old_img_h:
crop_top = old_img_h - new_crop_h
return CropTransform(int(crop_left), int(crop_top), int(new_crop_w),
int(new_crop_h), self.min_area_rate)
def get_transform(self, image, annotations):
along_x_info = []
along_y_info = []
#loop each gt box, then decide whether do shear by its category and prob
for anno_idx, anno in enumerate(annotations):
do_shear_x = rand_by_rate(self.shear_prob_x[anno["category_id"]])
do_shear_y = rand_by_rate(self.shear_prob_y[anno["category_id"]])
box_w = anno["bbox"][2] - anno["bbox"][0]
box_h = anno["bbox"][3] - anno["bbox"][1]
if do_shear_x:
#compute shear params
# compute shear length along x axis
real_shear_min_len_x = self.shear_min_len_x
real_shear_max_len_x = self.shear_max_len_x
if self.shear_min_len_x < self.balanced_point and self.shear_max_len_x > self.balanced_point and self.balanced_transform:
if rand_by_rate(0.5):
real_shear_min_len_x = self.balanced_point
else:
real_shear_max_len_x = self.balanced_point
shear_len_x = random.uniform(real_shear_min_len_x,
real_shear_max_len_x)
x_axis_shift = abs(shear_len_x) * box_h
new_w = box_w + int(round(x_axis_shift))
# compute rotation matrix
# why M looks like this? transform is: new_x=x+shear_len_x*y, new_y=y. each pixel will move a distance(x_axis_shift).
# if shear_len_x is negtive, pixel will be out of new img(new_w, h), we have to do a translation(x_axis_shift) to move it back.
M = np.array(
[[1, shear_len_x, x_axis_shift if shear_len_x < 0 else 0],
[0, 1, 0]])
M = get_inv_tuple_matrix(M)
color = get_random_color()
along_x_info.append({
"anno_idx": anno_idx,
"M": M,
"new_w": new_w,
"color": color
})
if do_shear_y:
#compute shear params
real_shear_min_len_y = self.shear_min_len_y
real_shear_max_len_y = self.shear_max_len_y
if self.shear_min_len_y < self.balanced_point and self.shear_max_len_y > self.balanced_point and self.balanced_transform:
if rand_by_rate(0.5):
real_shear_min_len_y = self.balanced_point
else:
real_shear_max_len_y = self.balanced_point
shear_len_y = random.uniform(real_shear_min_len_y,
real_shear_max_len_y)
y_axis_shift = abs(shear_len_y) * box_w
new_h = box_h + int(round(y_axis_shift))
M = np.array(
[[1, 0, 0],
[shear_len_y, 1, y_axis_shift if shear_len_y < 0 else 0]])
M = get_inv_tuple_matrix(M)
color = get_random_color()
along_y_info.append({
"anno_idx": anno_idx,
"M": M,
"new_h": new_h,
"color": color
})
if len(along_x_info) == 0 and len(along_y_info) == 0:
return NoOpTransform()
else:
return BoxShearTransform(along_x_info, along_y_info, annotations)
