opencv_101.py

import cv2 as cv

if __name__ == '__main__':
    src = cv.imread("people1.jpg")
    src = cv.resize(src, (0, 0), fx=0.5, fy=0.5)
    cv.imshow("input", src)
    cv.imwrite('people_src.jpg', src)
    hog = cv.HOGDescriptor()
    hog.setSVMDetector(cv.HOGDescriptor_getDefaultPeopleDetector())
    # Detect people in the image
    (rects, weights) = hog.detectMultiScale(src,
                                            winStride=(4, 4),
                                            padding=(8, 8),
                                            scale=1.25,
                                            useMeanshiftGrouping=False)
    for (x, y, w, h) in rects:
        cv.rectangle(src, (x, y), (x + w, y + h), (0, 0, 255), 2)

    cv.imshow("hog-detector", src)
    cv.imwrite('detector.jpg', src)
    cv.waitKey(0)
    cv.destroyAllWindows()