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 threading
import cv2
global timer
import sys

num = 0
def 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)