Display the webcam in Python using OpenCV (cv2)

webcam-cv2.py

"""
Simply display the contents of the webcam with optional mirroring using OpenCV 
via the new Pythonic cv2 interface.  Press <esc> to quit.
"""

import cv2


def show(img):
    ret, thresh1 = cv2.threshold(img, 127, 255, cv2.THRESH_BINARY)
    ret, thresh2 = cv2.threshold(img, 127, 255, cv2.THRESH_BINARY_INV)
    ret, thresh3 = cv2.threshold(img, 127, 255, cv2.THRESH_TRUNC)
    ret, thresh4 = cv2.threshold(img, 127, 255, cv2.THRESH_TOZERO)
    ret, thresh5 = cv2.threshold(img, 127, 255, cv2.THRESH_TOZERO_INV)
    titles = ['img', 'BINARY', 'BINARY_INV', 'TRUNC', 'TOZERO', 'TOZERO_INV']
    images = [img, thresh1, thresh2, thresh3, thresh4, thresh5]
    for i, (title, image) in enumerate(zip(titles, images)):
        cv2.imshow(title, image)


def show_webcam(mirror=False):
    cam = cv2.VideoCapture(0)
    while True:
        ret_val, img = cam.read()
        if mirror:
            img = cv2.flip(img, 1)
        #cv2.imshow('webcam', img)
        show(img)
        if cv2.waitKey(1) == 27:
            break  # esc to quit
    cv2.destroyAllWindows()


def main():
    show_webcam(mirror=True)


if __name__ == '__main__':
    main()