树莓派安装Python-OpenCV

在树莓派上安装OpenCV,网络上已经有很多教程方案，树莓派上的系统为2016年的jessie-raspbian，尝试过源代码安装的方式，但编译过程总是会出错，多方查找仍解决不了。
放弃了源代码安装，发现有很便捷的方式，可以安装Python版的OpenCV,只需2行命令。
在此之前请务必更新一下系统。

sudo apt-get update 
sudo apt-get upgrade
sudo apt-get install libopencv-dev
sudo apt-get install python-opencv

到此已完成OpenCV的安装，可以在Python中使用OpenCV了。

再编写个调用树莓派摄像头采集视频测的例程试一下：

# import the necessary packages
from picamera.array import PiRGBArray
from picamera import PiCamera
import time
import cv2

# initialize the camera and grab a reference to the raw camera capture
camera = PiCamera()
camera.resolution = (640, 480)
camera.framerate = 32
rawCapture = PiRGBArray(camera, size=(640, 480))

# allow the camera to warmup
time.sleep(0.1)

# capture frames from the camera
for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):
    # grab the raw NumPy array representing the image, then initialize the timestamp
    # and occupied/unoccupied text
    image = frame.array

    # show the frame
    cv2.imshow("Frame", image)
    key = cv2.waitKey(1) & 0xFF

    # clear the stream in preparation for the next frame
    rawCapture.truncate(0)

    # if the `q` key was pressed, break from the loop
    if key == ord("q"):
        break

祝学习愉快。