def detect_pnet(self, im):
"""Get face candidates through pnet
Parameters:
----------
im: numpy array
input image array
Returns:
-------
boxes: numpy array
detected boxes before calibration
boxes_c: numpy array
boxes after calibration
"""
h, w, c = im.shape
net_size = 12
current_scale = float(
net_size) / self.min_face_size # find initial scale
im_resized = self.processed_image(im, current_scale)
current_height, current_width, _ = im_resized.shape
# for fcn
all_boxes = list()
while min(current_height, current_width) > net_size:
#return the result predicted by pnet
#cls_cls_map : H*w*2
#reg: H*w*4
cls_cls_map, reg = self.pnet_detector.predict(im_resized)
#boxes: num*9(x1,y1,x2,y2,score,x1_offset,y1_offset,x2_offset,y2_offset)
boxes = self.generate_bbox(cls_cls_map[:, :, 1], reg,
current_scale, self.thresh[0])
current_scale *= self.scale_factor
im_resized = self.processed_image(im, current_scale)
current_height, current_width, _ = im_resized.shape
if boxes.size == 0:
continue
keep = py_nms(boxes[:, :5], 0.5, 'Union')
boxes = boxes[keep]
all_boxes.append(boxes)
if len(all_boxes) == 0:
return None, None, None
all_boxes = np.vstack(all_boxes)
# merge the detection from first stage
keep = py_nms(all_boxes[:, 0:5], 0.7, 'Union')
all_boxes = all_boxes[keep]
boxes = all_boxes[:, :5]
bbw = all_boxes[:, 2] - all_boxes[:, 0] + 1
bbh = all_boxes[:, 3] - all_boxes[:, 1] + 1
# refine the boxes
boxes_c = np.vstack([
all_boxes[:, 0] + all_boxes[:, 5] * bbw,
all_boxes[:, 1] + all_boxes[:, 6] * bbh,
all_boxes[:, 2] + all_boxes[:, 7] * bbw,
all_boxes[:, 3] + all_boxes[:, 8] * bbh, all_boxes[:, 4]
])
boxes_c = boxes_c.T
return boxes, boxes_c, None
def detect_onet(self, im, dets):
"""Get face candidates using onet
Parameters:
----------
im: numpy array
input image array
dets: numpy array
detection results of rnet
Returns:
-------
boxes: numpy array
detected boxes before calibration
boxes_c: numpy array
boxes after calibration
"""
h, w, c = im.shape
dets = self.convert_to_square(dets)
dets[:, 0:4] = np.round(dets[:, 0:4])
[dy, edy, dx, edx, y, ey, x, ex, tmpw, tmph] = self.pad(dets, w, h)
num_boxes = dets.shape[0]
cropped_ims = np.zeros((num_boxes, 48, 48, 3), dtype=np.float32)
for i in range(num_boxes):
tmp = np.zeros((tmph[i], tmpw[i], 3), dtype=np.uint8)
tmp[dy[i]:edy[i] + 1, dx[i]:edx[i] + 1, :] = im[y[i]:ey[i] + 1,
x[i]:ex[i] + 1, :]
cropped_ims[i, :, :, :] = (cv2.resize(tmp, (48, 48)) - 127.5) / 128
cls_scores, reg, landmark = self.onet_detector.predict(cropped_ims)
# prob belongs to face
cls_scores = cls_scores[:, 1]
keep_inds = np.where(cls_scores > self.thresh[2])[0]
if len(keep_inds) > 0:
# pickout filtered box
boxes = dets[keep_inds]
boxes[:, 4] = cls_scores[keep_inds]
reg = reg[keep_inds]
landmark = landmark[keep_inds]
else:
return None, None, None
# width
w = boxes[:, 2] - boxes[:, 0] + 1
# height
h = boxes[:, 3] - boxes[:, 1] + 1
landmark[:, 0::2] = (np.tile(w, (5, 1)) * landmark[:, 0::2].T +
np.tile(boxes[:, 0], (5, 1)) - 1).T
landmark[:, 1::2] = (np.tile(h, (5, 1)) * landmark[:, 1::2].T +
np.tile(boxes[:, 1], (5, 1)) - 1).T
boxes_c = self.calibrate_box(boxes, reg)
boxes = boxes[py_nms(boxes, 0.6, "Minimum")]
keep = py_nms(boxes_c, 0.6, "Minimum")
boxes_c = boxes_c[keep]
landmark = landmark[keep]
return boxes, boxes_c, landmark
def detect_rnet(self, im, dets):
"""Get face candidates using rnet
Parameters:
----------
im: numpy array
input image array
dets: numpy array
detection results of pnet
Returns:
-------
boxes: numpy array
detected boxes before calibration
boxes_c: numpy array
boxes after calibration
"""
h, w, c = im.shape
dets = self.convert_to_square(dets)
dets[:, 0:4] = np.round(dets[:, 0:4])
# 对PNet送进来的图像进行处理，填充+resize
[dy, edy, dx, edx, y, ey, x, ex, tmpw, tmph] = self.pad(dets, w, h)
num_boxes = dets.shape[0]
cropped_ims = np.zeros((num_boxes, 24, 24, 3), dtype=np.float32)
for i in range(num_boxes):
tmp = np.zeros((tmph[i], tmpw[i], 3), dtype=np.uint8)
tmp[dy[i]:edy[i] + 1, dx[i]:edx[i] + 1, :] = im[y[i]:ey[i] + 1,
x[i]:ex[i] + 1, :]
cropped_ims[i, :, :, :] = (cv2.resize(tmp, (24, 24)) - 127.5) / 128
# cls_scores : num_data*2
# reg: num_data*4
# landmark: num_data*10
cls_scores, reg, _ = self.rnet_detector.predict(
cropped_ims) # 获得概率值、偏移系数值
cls_scores = cls_scores[:, 1]
keep_inds = np.where(cls_scores > self.thresh[1])[0]
if len(keep_inds) > 0:
boxes = dets[keep_inds] # PNet输出的区域赋值给boxes
boxes[:, 4] = cls_scores[keep_inds]
reg = reg[keep_inds]
# landmark = landmark[keep_inds]
else:
return None, None, None
keep = py_nms(boxes, 0.6)
boxes = boxes[keep]
boxes_c = self.calibrate_box(boxes, reg[keep]) # 计算微调之后的边框
return boxes, boxes_c, None
