Python 显示图片和调用摄像头

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

'''读取并显示图片  import cv2 img = cv2.imread("D:/python/a.jpg") cv2.namedWindow("Image") cv2.imshow("Image", img) cv2.waitKey (0) ''' import cv2 import numpy as np import pickle     cap = cv2.VideoCapture(0 + cv2.CAP_DSHOW) #python cv2调用摄像头时出现python已停止工作错误:cap = cv2.VideoCapture(0 + cv2.CAP_DSHOW) 即可 #现在网上都是一个版本，哪怕教材也是这样     while True:   ret,frame = cap.read()   # Our operations on the frame come here   gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)   # Display the resulting frame   cv2.imshow('frame',gray)   if cv2.waitKey(1) & 0xFF == ord('q'):     break     # When everything done, release the capture cap.release() cv2.destroyAllWindows()