1、窗口循环读取
import numpy as np
import cv2
import matplotlib.pyplot as plt
import os
from itertools import cycle
filename = os.listdir("../images")
img_iter = cycle([cv2.imread(os.sep.join(["../images",x]))for x in filename])
key = 0
while key != 27:
cv2.imshow("img",next(img_iter))
key = cv2.waitKey(42)
2、获取键盘值