树莓派用python中的OpenCV输出USB摄像头画面

2019-11-25 12:40:58

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本文实例为大家分享了python OpenCV来表示USB摄像头画面的具体代码，供大家参考，具体内容如下

确认Python版本

$ pythonPython 2.7.13 (default, Jan 19 2019, 14:48:08) [GCC 6.3.0 20170124] on linux2Type "help", "copyright", "credits" or "license" for more information.>>> quit()

确认OS版本

$ uname -aLinux raspberrypi 3.18.11-v7+ #781 SMP PREEMPT Tue Apr 21 18:07:59 BST 2015 armv7l GNU/Linux$ lsb_release -aNo LSB modules are available.Distributor ID: RaspbianDescription: Raspbian GNU/Linux 9.1 (stretch)Release: 9.1

安装OpenCV和Python版的OpenCV安装包

$ sudo apt-get install libopencv-dev$ sudo apt-get install python-opencv

Python的例程

import cv2#初期化USB摄像头cap = cv2.VideoCapture(0)while( cap.isOpened() ): #USB摄像头工作时,读取一帧图像 ret, frame = cap.read() #显示图像窗口在树莓派的屏幕上 cv2.imshow('Capture',frame) #按下q键退出 key = cv2.waitKey(1) #print( '%08X' % (key&0xFFFFFFFF) ) if key & 0x00FF == ord('q'): break# 释放资源和关闭窗口cap.release()cv2.destroyAllWindows()

图像输出的树莓派截屏