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Original file line number | Diff line number | Diff line change |
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import cv2 | ||
import os | ||
import gdown | ||
from deepface.detectors import FaceDetector | ||
from deepface.commons import functions | ||
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def build_model(): | ||
url = "https://github.com/opencv/opencv_zoo/raw/main/models/face_detection_yunet/face_detection_yunet_2023mar.onnx" | ||
file_name = "face_detection_yunet_2023mar.onnx" | ||
home = functions.get_deepface_home() | ||
if os.path.isfile(home + f"/.deepface/weights/{file_name}") is False: | ||
print(f"{file_name} will be downloaded...") | ||
output = home + f"/.deepface/weights/{file_name}" | ||
gdown.download(url, output, quiet=False) | ||
face_detector = cv2.FaceDetectorYN_create( | ||
home + f"/.deepface/weights/{file_name}", "", (0, 0) | ||
) | ||
return face_detector | ||
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def detect_face(detector, image, align=True, score_threshold=0.9): | ||
# FaceDetector.detect_faces does not support score_threshold parameter. | ||
# We can set it via environment variable. | ||
score_threshold = os.environ.get("yunet_score_threshold", score_threshold) | ||
resp = [] | ||
detected_face = None | ||
img_region = [0, 0, image.shape[1], image.shape[0]] | ||
faces = [] | ||
height, width = image.shape[0], image.shape[1] | ||
# resize image if it is too large (Yunet fails to detect faces on large input sometimes) | ||
# I picked 640 as a threshold because it is the default value of max_size in Yunet. | ||
resized = False | ||
if height > 640 or width > 640: | ||
r = 640.0 / max(height, width) | ||
original_image = image.copy() | ||
image = cv2.resize(image, (int(width * r), int(height * r))) | ||
height, width = image.shape[0], image.shape[1] | ||
resized = True | ||
detector.setInputSize((width, height)) | ||
detector.setScoreThreshold(score_threshold) | ||
_, faces = detector.detect(image) | ||
if faces is None: | ||
return resp | ||
for face in faces: | ||
""" | ||
The detection output faces is a two-dimension array of type CV_32F, | ||
whose rows are the detected face instances, columns are the location of a face and 5 facial landmarks. | ||
The format of each row is as follows: | ||
x1, y1, w, h, x_re, y_re, x_le, y_le, x_nt, y_nt, x_rcm, y_rcm, x_lcm, y_lcm, | ||
where x1, y1, w, h are the top-left coordinates, width and height of the face bounding box, | ||
{x, y}_{re, le, nt, rcm, lcm} stands for the coordinates of right eye, left eye, nose tip, the right corner and left corner of the mouth respectively. | ||
""" | ||
(x, y, w, h, x_re, y_re, x_le, y_le) = list(map(int, face[:8])) | ||
if resized: | ||
image = original_image | ||
x, y, w, h = int(x / r), int(y / r), int(w / r), int(h / r) | ||
x_re, y_re, x_le, y_le = ( | ||
int(x_re / r), | ||
int(y_re / r), | ||
int(x_le / r), | ||
int(y_le / r), | ||
) | ||
confidence = face[-1] | ||
confidence = "{:.2f}".format(confidence) | ||
detected_face = image[int(y) : int(y + h), int(x) : int(x + w)] | ||
img_region = [x, y, w, h] | ||
if align: | ||
detected_face = yunet_align_face(detected_face, x_re, y_re, x_le, y_le) | ||
resp.append((detected_face, img_region, confidence)) | ||
return resp | ||
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# x_re, y_re, x_le, y_le stands for the coordinates of right eye, left eye | ||
def yunet_align_face(img, x_re, y_re, x_le, y_le): | ||
img = FaceDetector.alignment_procedure(img, (x_le, y_le), (x_re, y_re)) | ||
return img |