python opencv捕获摄像头并显示内容
1、捕获摄像头和实时显示
import cv2 import numpy as np import pickle import matplotlib.pyplot as plt cap = cv2.VideoCapture(0) 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()
2、从摄像头内抓拍图片
import cv2 import numpy as np import pickle import matplotlib.pyplot as plt cap = cv2.VideoCapture(0) index = 0 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('p'): cv2.imwrite("kk.jpg",frame) index = index + 1 if cv2.waitKey(1) & 0xFF == ord('q'): break # When everything done, release the capture cap.release() cv2.destroyAllWindows()