hog_face_detection.py

#https://www.pyimagesearch.com/2021/04/19/face-detection-with-dlib-hog-and-cnn/

from helpers import convert_and_trim_bb
import argparse
import imutils
import time
import dlib
import cv2

# construct the argument parser and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", type=str, required=True,
	help="path to input image")
ap.add_argument("-u", "--upsample", type=int, default=1,
	help="# of times to upsample")
args = vars(ap.parse_args())

# load dlib's HOG + Linear SVM face detector
print("[INFO] loading HOG + Linear SVM face detector...")
detector = dlib.get_frontal_face_detector()
# load the input image from disk, resize it, and convert it from
# BGR to RGB channel ordering (which is what dlib expects)
image = cv2.imread(args["image"])
image = imutils.resize(image, width=600)
rgb = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
# perform face detection using dlib's face detector
start = time.time()
print("[INFO[ performing face detection with dlib...")
rects = detector(rgb, args["upsample"])
end = time.time()
print("[INFO] face detection took {:.4f} seconds".format(end - start))

# convert the resulting dlib rectangle objects to bounding boxes,
# then ensure the bounding boxes are all within the bounds of the
# input image
boxes = [convert_and_trim_bb(image, r) for r in rects]
# loop over the bounding boxes
for (x, y, w, h) in boxes:
	# draw the bounding box on our image
	cv2.rectangle(image, (x, y), (x + w, y + h), (0, 255, 0), 2)
# show the output image
cv2.imshow("Output", image)
cv2.waitKey(0)