OpenCV第一次尝试

1. opencv在ubuntu上的配置和测试

http://blog.youkuaiyun.com/a1429331875/article/details/31539129

2. OpenCV 3.0 程序编译链接错误

问题描述

error: main.o: undefined reference to symbol ‘_ZN2cv6imreadERKNS_6StringEi’
/usr/local/OpenCV/Release/lib/libopencv_imgcodecs.so.3.0:-1: error: error adding symbols: DSO missing from command line
error: collect2: error: ld returned 1 exit status

解决方案

问题描述里已经表述得很清楚了，需要链接libopencv_imgcodecs.so，这可能是和2.x版本的一处不同。

如果问题描述为：

error: undefined reference to `cv::imread(cv::String const&, int)’

解决方法同上。

3. 编译时需要添加的库

    INCLUDEPATH += /usr/local/include \
                    /usr/local/include/opencv \
                    /usr/local/include/opencv2

    LIBS += /usr/local/lib/libopencv_highgui.so \
            /usr/local/lib/libopencv_core.so    \
            /usr/local/lib/libopencv_imgproc.so  \
            /usr/local/lib/libopencv_imgcodecs.so

4. 测试

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
using namespace cv;
using namespace std;

int main()
{
        namedWindow( "src");
        Mat img = imread( "/home/ld/Documents/lena.jpg" );

        if(!img.data) {
            cout<<"file not fount"<<endl;
            return 1;
        }
        else {
             imshow( "src", img );
             waitKey();
             return 0;
        }
}