python读取完摄像头后如何抓图保存

三个摄像头 如何设置按多少秒(或帧)，或者抓取张数来保存图片

sysRun = 1
while sysRun == 1:
    ret1, frame1 = cap1.read()
    img1 = cv2.resize(frame1,(200,200))
#    cv2.imshow(ip1,frame1)
    ret2, frame2 = cap2.read()
    img2 = cv2.resize(frame2,(200,200))
#    cv2.imshow(ip2,frame2)
    ret3, frame3 = cap3.read()
    img3 = cv2.resize(frame3,(200,200))
#    cv2.imshow(ip3,frame3)
    image = np.hstack((img1,img2,img3))
    cv2.imshow('camera',image)

    #按下q键关闭窗体
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

time.sleep延时或者time.datetime时间戳判断经过的时间