sudo raspi-config // 进入后打开摄像头、SSH
sudo apt-get update
sudo apt-get upgrade
sudo rpi-update

sudo apt-get install build-essential cmake git pkg-config

sudo apt-get install libjpeg8-dev 
sudo apt-get install libtiff5-dev 
sudo apt-get install libjasper-dev 
sudo apt-get install libpng12-dev 

sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev

sudo apt-get install libgtk2.0-dev
sudo apt-get install libatlas-base-dev gfortran

git clone https://github.com/opencv/opencv.git

// 根据下载的版本而定
cd opencv-3.2.0 
// 创建release文件夹
mkdir release
// 进入release目录下
cd release
// cmake读入所有源文件之后，自动生成makefile
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
// 编译
sudo make
// 安装
sudo make install
//更新动态链接库
sudo ldconfig

sudo nano /etc/modules
// 进入编辑界面后，在末尾添加输入
snd-bcm2835
bcm2835-v4l2

# -*- coding: utf-8 -*-
__author__ = "kyoRan"

import cv2

cap = cv2.VideoCapture(0)          # 打开摄像头
print("VideoCapture is opened", cap.isOpened())

while(True):

 ret, frame = cap.read()          # 读取摄像头图像
 center = (frame.shape[1]//2, frame.shape[0]//2)    # 图像中心点位置

 gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)    # 转灰度
 cv2.circle(gray, center=center, radius=100, color=(0,0,255)) # 画圆
 cv2.imshow("frame", gray)         # 显示图片

 if cv2.waitKey(1) & 0xFF == ord('q'):
  break

cap.release()   # 释放摄像头
cv2.destroyAllWindows() # 关闭所有窗口