树莓派用python中的OpenCV输出USB摄像头画面

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

$ python

Python 2.7.13 (default, Jan 19 2019, 14:48:08)

[GCC 6.3.0 20170124] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> quit()

确认OS版本

$ uname -a

Linux raspberrypi 3.18.11-v7+ #781 SMP PREEMPT Tue Apr 21 18:07:59 BST 2015 armv7l GNU/Linux

$ lsb_release -a

No LSB modules are available.

Distributor ID: Raspbian

Description: 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

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