基于python-opencv的摄像头识别五角星

每秒截取摄像头的一张照片放到文件夹，在读取识别。

使用前在D盘创建一个Images的文件夹就ok了。

import threadingimport cv2global timerimport sysnum = 0def shot_img():    global num    success, frame = cameraCapture.read()    print(num)    path = "D:/Images/"    cv2.imwrite( path +str(num) + '.png', frame)    e = cv2.imread("D:/Images/" + str(num) + '.png')    g = cv2.cvtColor(e, cv2.COLOR_BGR2GRAY)    r, b = cv2.threshold(g, 0, 255, cv2.THRESH_OTSU)    cr, t = cv2.findContours(b, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)    ep = 0.01 * cv2.arcLength(cr[1], True)    ap = cv2.approxPolyDP(cr[1], ep, True)    co = len(ap)    if  co==10: print("五角星")    else: print("识别失败")    num += 1    if num==5: cameraCapture.release() cv2.destroyAllWindows() sys.exit()    timer = threading.Timer(1, shot_img)    timer.start()#---------------------------------------------------------------------------------------------------if __name__ == '__main__':    cameraCapture = cv2.VideoCapture(0)    timer = threading.Timer(1, shot_img)    timer.start()    cv2.waitKey(1000)