Question

我试图用C ++学习openCV，而且我正在使用Windows 7（x64）上最新版本的openCV处理代码块13.12。作为一个开始，我测试了我的网络摄像头的简单输出，女巫工作没有麻烦。接下来，我尝试使用cvtColor(img, img_gray, CV_BGR2GRAY)修改输出。如您所见，我收到2条错误消息。另外，为了澄清，我VisuWork vW是为了在OOP中作为练习正确编码而创建的一个类。班级没有做任何特别的事情。请任何人帮我找到这个问题的问题？请你帮忙和时间。

main.cpp：

#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui_c.h>
#include <opencv/highgui.h>

using namespace cv;
using namespace std;

    class VisuWork
    {
        CvCapture* capture;
    public:
        VisuWork()
        {
            capture=cvCaptureFromCAM(CV_CAP_ANY);
        };
        template<typename Type> void sHow(Type frame)
        {
    //        IplImage* frame = cvQueryFrame(capture); //Create image frames from capture
            cvShowImage("Camera_Output", frame); //Show image frames on created window
        }
    //    void imHSV(IplImage* frame){
    //        Mat im(frame);
    //        Mat hsv;
    //        cvtColor(im, hsv, CV_BGR2HSV);
    //    }
        ~VisuWork()
        {
            cvReleaseCapture(&capture); //Release capture.
            cvDestroyWindow("Camera_Output"); //Destroy Window
        }

    };

        int main( int argc, const char** argv )
        {
            CvCapture* capture = 0;
            capture = cvCaptureFromCAM(CV_CAP_ANY);
            if (!capture)
            {
                // print error, quit application
            }
            else
            {
                VisuWork vW;
                while(1)  //Create infinte loop for live streaming
                {
                    IplImage* im = cvQueryFrame(capture);
                    if(!im){}
                    else{
                    //        vW.imHSV(frame);

                    Mat img_gray(im);
                    vW.sHow(im);
                  cvtColor(img, img_gray, CV_BGR2GRAY);
                    }
                    int key = cvWaitKey(10); //Capture Keyboard stroke
                    if (char(key) == 27)
                    {
                        break; //If you hit ESC key loop will break.
                    }
                }
                cvReleaseCapture(&capture); //Release capture.
                cvDestroyWindow("Camera_Output"); //Destroy Window
            }

        }

错误消息：

C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text+0x7b): undefined reference to cv::Mat::Mat(_IplImage const*, bool) C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text$_ZN2cv3MatD1Ev[__ZN2cv3MatD1Ev]+0x2d): undefined reference to cv::fastFree(void*)

这是完整的构建日志：

mingw32-g ++。exe -std = c ++ 11 -Wall -IC：\ RPS \ python \ edp32 \ opencv \ build \ include -c C：\ Users \ PTOSH \ Documents \ tries.cpp -o C： \用户\ PTOSH \文档\ tried.o mingw32-g ++。exe -LC：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib -L＆＃34; C：\ Program Files（x86）\ CodeBlocks \ MinGW \ lib＆＃34; -LC：\ RPS \ python \ edp32 \ opencv \ sources \ 3rdparty -o C：\ Users \ PTOSH \ Documents \ tries.exe C：\ Users \ PTOSH \ Documents \ tries.o C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_calib3d248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_calib3d248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_contrib248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_contrib248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_core248。 lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_core248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_features2d248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_features2d248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_flann248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_flann248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_gpu248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_gpu248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_highgui248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_highgui248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_imgproc248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_imgproc248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_legacy248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_legacy248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_ml248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_ml248d。 lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_nonfree248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_nonfree248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_objdetect248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_objdetect248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_ocl248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_ocl248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_photo248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_photo248d .lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_stitching248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_stitching248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_superres248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_superres248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_ts248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_ts248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_video248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_video248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_videostab248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x86 \ vc12 \ lib \ opencv_videostab248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_calib3d248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_calib3d248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_contrib248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_contrib248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc1 2 \ lib \ opencv_core248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_core248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_features2d248。 lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_features2d248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_flann248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_flann248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_gpu248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_gpu248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_highgui248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_highgui248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_imgproc248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_imgproc248d.lib C ：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_legacy248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_legacy248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_ml248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_ml248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_nonfree248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_nonfree248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_objdetect248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_objdetect248d.lib C： \ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_ocl248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_ocl248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_photo248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_photo248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_stitching248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_stitching248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_superres248 .lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_superres248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_ts248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_ts248d.lib C：\ RPS \ python \ edp32 \ o pencv \ build \ x64 \ vc12 \ lib \ opencv_video248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_video248d.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_videostab248.lib C：\ RPS \ python \ edp32 \ opencv \ build \ x64 \ vc12 \ lib \ opencv_videostab248d.lib C：\ Users \ PTOSH \ Documents \ tries.o：trying.cpp :(。text + 0x7b）：未定义引用cv::Mat::Mat(_IplImage const*, bool)' C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text$_ZN2cv3MatD1Ev[__ZN2cv3MatD1Ev]+0x2d): undefined reference to cv :: fastFree（void ）＆＃39 * c：/ program files（x86）/ codeblocks / mingw / bin /../ lib / gcc / mingw32 / 4.8.1 /../../../../ mingw32 / bin / ld.exe:C： \ Users \ PTOSH \ Documents \ tries.o：在`.text $ _ZN2cv3MatD1Ev [__ ZN2cv3MatD1Ev]＆＃39;部分中错误的重定位地址0x2d c：/ program files（x86）/ codeblocks / mingw / bin /../ lib / gcc / mingw32 / 4.8.1 /../../../../ mingw32 / bin / ld.exe：final link失败：操作无效 collect2.exe：错误：ld返回1退出状态处理终止，状态为1（0分钟，1秒（秒）） 2个错误，0个警告（0分钟，1秒（s））

Answer 1

如果你真的想使用c ++ api（你应该，因为旧的c-one 死），

CvCapture* capture; 
// no, use: cv::VideoCapture

IplImage* frame = cvQueryFrame(capture); 
// no, use: cv::Mat frame; capture.read(frame)

等。抛弃所有cv *函数并用它们的cv ::对象替换它们（也许最好从头开始）

（顺便说一下，来自SO的代码片段几乎总是过时的，要警惕）

并阅读docs（底部的教程链接）

整个相机捕捉归结为c ++中的几行：

#include "opencv2/core/core.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include "opencv2/highgui/highgui.hpp"

using namespace cv;

int main()
{
    VideoCapture cap(0); // get first cam
    while( cap.isOpened() )
    {
        Mat frame;
        if ( ! cap.read(frame) ) // cam might need some warmup
            continue;

        // your processing goes here

        imshow("lalala",frame);
        if ( waitKey(10)==27 )
            break;
    }
    return 0;
}

Answer 2

@berak：好的，我删除了#include <opencv/highgui.h>。但仍然面临cvtColor（）部分的问题。

C：\ Users \ PTOSH \ Documents \ tries.o：trying.cpp :(。text + 0x75）：未定义引用cv::Mat::Mat(_IplImage const*, bool)' C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text+0x9b): undefined reference to cv :: _ OutputArray :: _ OutputArray（cv :: Mat＆amp;）' C：\ Users \ PTOSH \ Documents \ tries.o：trying.cpp :(。text + 0xae）：未定义引用cv::_InputArray::_InputArray(cv::Mat const&)' C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text+0xd3): undefined reference to cv :: cvtColor（cv :: _ InputArray const＆amp;，cv :: _ OutputArray const＆amp; ，int，int）'

@ a-Jays：为什么不呢？无论如何，我删除了这个类，可能更容易开始测试openCV而没有。

请回复。

Answer 3

@berak：

如果你真的想使用c ++ api（你应该，因为旧的 c-one死了），

> CvCapture* capture;  // no, use: cv::VideoCapture
> 
> IplImage* frame = cvQueryFrame(capture);  // no, use: cv::Mat frame;
> capture.read(frame)

等。抛弃所有cv *函数并用它们的cv替换它们::   同行（也许最好从头开始）

（顺便说一下，来自SO的代码片段几乎总是过时的，要警惕   那）

并阅读文档（底部的教程链接）

整个相机捕捉归结为c ++中的几行：

> #include "opencv2/core/core.hpp"
> #include "opencv2/imgproc/imgproc.hpp"
> #include "opencv2/highgui/highgui.hpp"
> 
> using namespace cv;
> 
> int main() {
>     VideoCapture cap(0); // get first cam
>     while( cap.isOpened() )
>     {
>         Mat frame;
>         if ( ! cap.read(frame) ) // cam might need some warmup
>             continue;
> 
>         // your processing goes here
> 
>         imshow("lalala",frame);
>         if ( waitKey(10)==27 )
>             break;
>     }
>     return 0; }

您的代码正在向我返回以下错误，是否可能在我的代码块设置中显示链接失败？：

C：\ Users \ PTOSH \ Documents \ tries.o：trying.cpp :(。text + 0x35）：undefined 引用cv::VideoCapture::VideoCapture(int)' C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text+0x57): undefined reference to cv :: VideoCapture :: read（cv :: Mat＆amp;）' C：\ Users \ PTOSH \ Documents \ tries.o：trying.cpp :(。text + 0x7b）：undefined 引用cv::_InputArray::_InputArray(cv::Mat const&)' C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text+0xb5): undefined reference to cv :: imshow（std :: string const＆amp;，cv :: _ InputArray const＆amp;）' C：\ Users \ PTOSH \ Documents \ tries.o：trying.cpp :(。text + 0xd5）：undefined 引用cv::waitKey(int)' C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text+0x109): undefined reference to cv :: VideoCapture :: isOpened（）const' C：\ Users \ PTOSH \ Documents \ tries.o：trying.cpp :(。text + 0x120）：undefined 引用cv::VideoCapture::~VideoCapture()' C:\Users\PTOSH\Documents\tried.o:tried.cpp:(.text+0x162): undefined reference to cv :: VideoCapture :: ~VideoCapture（）'

请求帮助。

OpenCV undefined对Mat的引用

main.cpp：

错误消息：

这是完整的构建日志：

3 个答案: