英文原文地址：http://marcelojo.org/marcelojoeng/2014/09/installing-opencv-2-4-9-qt5-in-ubuntu.html
如果不熟悉OpenCV和QT的朋友，請參考下列鏈接：
http://opencv.org/
http://qt-project.org/
安裝 QT：
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mkdir qt5
cd qt5
wget http://download.qt-project.org/official_releases/online_installers/qt-opensource-linux-x64-1.6.0-4-online.run
chmod +x ./qt-opensource-linux-x64-1.6.0-4-online.run
sudo ./qt-opensource-linux-x64-1.6.0-4-online.run
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注：ubuntu14.04自帶Qt5 及 QtCreator的安裝：sudo apt-get install qtcreator
編譯OpenCV
注：ubuntu14.04自帶OpenCV的安裝，可通過命令查詢：apt-cache search opencv
首先，需要安裝一些需要的包：
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sudo apt-get install build-essential
sudo apt-get install libgtk2.0-dev
sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev
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其次，下載OpenCV，保存到你選擇的目錄，如 opencv。
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cd opencv
unzip ./opencv-2.4.9.zip
cd opencv-2.4.9
mkdir build
cd build
cmake -D WITH_V4L=ON -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D BUILD_EXAMPLES=ON -D WITH_GTK_2_X=ON ..
//懶人辦法，直接用cmake-gui 效果一樣。不會用的請留言。
make
sudo make install
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默認情況下，庫文件會安裝在 /usr/local/lib。如果想看cmake的選項，參看文件 CMakeLists.txt。
爲了能夠鏈接到 lib，需要在目錄/etc/ld.so.conf.d/ 下創建一個文件 opencv.conf:
<pre name="code" class="cpp">touch opencv.conf
gvim opencv.conf //使用任何你熟悉的文本編輯器在文件內寫入並保存：
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/usr/local/lib
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然後在此目錄下執行：
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sudo ldconfig
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測試 OpenCV
如果想測試的話，請進入 ./build/bin 並執行測試程序如：
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cd ./bin
cd ./open_test_photo
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QT5 + OpenCV
首先打開 QTCreator，
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/opt/Qt/Tools/QtCreator/bin/qtcreator
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創建 Qt控制檯應用項目：
選擇Desktop平臺，直到嚮導結束。
現在需要告訴Qt 庫文件安裝在了哪裏。打開 .pro 文件並添加以下路徑：
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INCLUDEPATH += .
INCLUDEPATH += /usr/local/include
INCLUDEPATH += /usr/local/include/opencv
INCLUDEPATH += /usr/local/include/opencv2
INCLUDEPATH += /usr/local/include/opencv2/core
INCLUDEPATH += /usr/local/include/opencv2/highgui
INCLUDEPATH += /usr/local/include/opencv2/imgproc
INCLUDEPATH += /usr/local/include/opencv2/flann
INCLUDEPATH += /usr/local/include/opencv2/photo
INCLUDEPATH += /usr/local/include/opencv2/video
INCLUDEPATH += /usr/local/include/opencv2/features2d
INCLUDEPATH += /usr/local/include/opencv2/objdetect
INCLUDEPATH += /usr/local/include/opencv2/calib3d
INCLUDEPATH += /usr/local/include/opencv2/ml
INCLUDEPATH += /usr/local/include/opencv2/contrib
LIBS += `pkg-config opencv --cflags --libs`
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測試程序：
在我們的例程“hello world”裏，顯示一幅圖像：當然是lena.jpg（注：OpenCV經典例圖）。你需要把要顯示的圖像（lena.jpg）放在程序相應的debug或release目錄裏。否則程序會找不到圖像而無法顯示。
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#include <QCoreApplication>
#include <opencv2/highgui.hpp>
#include <opencv2/core.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, char *argv[])
{
Mat image;
image = imread("lena.jpg"); //
Read the file
if(!image.data)
{
cout << "nenhuma
imagem!";
}
else
{
cout << "imagem
carregada!";
}
cv::namedWindow("Teste
imagem");
cv::imshow("Teste
imagem", image);
cv::waitKey(0);
return 0;
}
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編譯並運行，便會看到下列圖像：
