display Contours in live webcam video feed

Contours_pycv_ex01.py

import cv2


if __name__ == '__main__':
    video_capture = cv2.VideoCapture(0)
    while True:

        # Capture frame-by-frame
        ret, frame = video_capture.read()

        #convert to grayscale image
        imgray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
        ret,thresh = cv2.threshold(imgray,127,255,0)
        contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
        cv2.drawContours(frame,contours,-1,(0,255,0),3)


        # Display the resulting frame
        cv2.imshow('Video', frame)


        if cv2.waitKey(1) & 0xFF == ord('q'):
            break

        
    # When everything is done, release the capture
    video_capture.release()
    cv2.destroyAllWindows()