【openCV调用摄像头】python

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一、openCV调用摄像头

代码如下（示例）：

import cv2
import time

import numpy as np
def video_demo():
    a =time.time()
    print(a)
    capture = cv2.VideoCapture(0)#0为电脑内置摄像头
    # 更改分辨率大小和fps大小
    capture.set(cv2.CAP_PROP_FRAME_WIDTH,1280)
    capture.set(cv2.CAP_PROP_FRAME_HEIGHT,960)
    capture.set(cv2.CAP_PROP_FPS, 70)
    resize = (int(capture.get(cv2.CAP_PROP_FRAME_WIDTH)), int(capture.get(cv2.CAP_PROP_FRAME_HEIGHT)))
    print(resize)
    # 记录调用时长
    print(time.time() - a)
    print(time.strftime('%Y-%m-%d %H:%M:%S'))
    
    while(True):
        fps = capture.get(cv2.CAP_PROP_FPS)
        print(fps)
        ret, frame = capture.read()#摄像头读取,ret为是否成功打开摄像头,true,false。 frame为视频的每一帧图像
        frame = cv2.flip(frame, 1)#摄像头是和人对立的，将图像左右调换回来正常显示。
        cv2.imshow("video", frame)
        c = cv2.waitKey(50)
        if c == 27:
            break
video_demo()
cv2.destroyAllWindows()