之前配置好的環境給玩壞了，正好整理下opencv和qt的安裝方式。

1.首先換成國內源，我用的是清華的源

sudo nano /etc/apt/sources.list

把原來的註釋掉換成

deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main non-free contrib
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main non-free contrib

ctrl+o 儲存 enter確認 ctrl+x退出

然後update一下

sudo apt-get update
 

2.安裝opencv各種依賴項

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

sudo apt-get install libopencv-dev
sudp apt-get install libcv-dev
 

3.在/home/pi目錄下建立opencv目錄

mkdir opencv
cd opencv

4.下載opencv3.4.1原始碼

wget -O opencv-3.4.1.zip https://github.com/Itseez/opencv/archive/3.4.1.zip
wget -O opencv_contrib-3.4.1.zip https://github.com/Itseez/opencv_contrib/archive/3.4.1.zip
unzip opencv-3.4.1.zip
unzip opencv_contrib-3.4.1.zip

5.在opencv-3.4.1裡建立release目錄

cd opencv-3.4.1
mkdir release
cd release
 

6.生成makefile

sudo cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=/usr/local ..

7.編譯安裝

sudo make
sudo make install
sudo ldconfig

8.安裝qt5及qtcreator

sudo apt-get install qt5-default
sudp apt-get install qtcreator

9.配置qt5

compiler裡點選Add，新增C++編譯器，選擇/usr/bin/裡的g++，apply，kit裡編譯器選剛剛配置好的g++

10.qt配置opencv

.pro裡新增如下程式碼

INCLUDEPATH += /usr/local/include \
		               /usr/local/include/opencv \
		               /usr/local/include/opencv2
LIBS += -L /usr/local/lib/ -lopencv_highgui -lopencv_core -lopencv_imgproc \
		                         -lopencv_video -lopencv_videoio -lopencv_imgcodecs -lpthread

 測試程式碼：

Mat img;
VideoCapture camera(0);
if(!camera.isOpen())
{
	qDebug()<<"open camera error!";
	return;
}
while(1)
{
	camera >> img;
	imshow("camera",img);
	if(waitKey(30) == 27)
		break;
}

坑爹的opencv啊。。