从VisualStudio（C ++）到Matlab

Question

我已经用VisualStudio（C ++）编写了一个网络摄像头应用程序，该应用程序捕获网络摄像头的提要，并使用opencv软件包在窗口中显示它。我可以编译并运行该解决方案，而不会出现任何问题。我还用Matlab MEX编写了代码，并使用VisualStudio的C ++编译器对其进行了编译，但是运行MEX文件时没有任何反应。如何使用MEX文件显示窗口？

这是针对较大的应用程序（在Matlab应用程序设计中创建），在该应用程序中，我需要能够使用网络摄像头快照图像。它当前正在运行VS中编译的网络摄像头程序的.exe文件，但我希望将此功能转换为MEX函数，以便能够编译我正在使用的应用程序。

在VS中编译的程序：

#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char* argv[])
{
    //Open the default video camera
    VideoCapture cap(0);

    // if not success, exit program
    if (cap.isOpened() == false)
    {
        cout << "Cannot open the video camera" << endl;
        cin.get(); //wait for any key press
        return -1;
    }

    double dWidth = cap.get(CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
    double dHeight = cap.get(CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video

    cout << "Resolution of the video : " << dWidth << " x " << dHeight << endl;

    string window_name = "My Camera Feed";
    namedWindow(window_name); //create a window called "My Camera Feed"

    while (true)
    {
        Mat frame;
        bool bSuccess = cap.read(frame); // read a new frame from video 

        //Breaking the while loop if the frames cannot be captured
        if (bSuccess == false)
        {
            cout << "Video camera is disconnected" << endl;
            cin.get(); //Wait for any key press
            break;
        }

        //show the frame in the created window
        imshow(window_name, frame);

        //wait for for 10 ms until any key is pressed.  
        //If the 'Esc' key is pressed, break the while loop.
        //If the any other key is pressed, continue the loop 
        //If any key is not pressed withing 10 ms, continue the loop 
        if (waitKey(10) == 27)
        {
            cout << "Esc key is pressed by user. Stoppig the video" << endl;
            break;
        }
    }

    return 0;

}

Matlab中的程序：

/* webcam
 * Runs webcam from matlab
 * capture window: ctrl + c
 * end window: esc
 */

#include "mex.hpp"
#include "mexAdapter.hpp"
#include <opencv2/opencv.hpp>
#include <iostream>

using namespace cv;
using namespace std;
using namespace matlab::data;
using matlab::mex::ArgumentList;

class MexFunction : public matlab::mex::Function {
public:
    int operator()() {
        //Open the default video camera
    VideoCapture cap(0);

    // if not success, exit program
    if (cap.isOpened() == false)
    {
        cout << "Cannot open the video camera" << endl;
        cin.get(); //wait for any key press
        return -1;
    }

    double dWidth = cap.get(CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
    double dHeight = cap.get(CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video

    cout << "Resolution of the video : " << dWidth << " x " << dHeight << endl;

    string window_name = "My Camera Feed";
    namedWindow(window_name); //create a window called "My Camera Feed"

    while (true)
    {
        Mat frame;
        bool bSuccess = cap.read(frame); // read a new frame from video 

        //Breaking the while loop if the frames cannot be captured
        if (bSuccess == false)
        {
            cout << "Video camera is disconnected" << endl;
            cin.get(); //Wait for any key press
            break;
        }

        //show the frame in the created window
        imshow(window_name, frame);

        //wait for for 10 ms until any key is pressed.  
        //If the 'Esc' key is pressed, break the while loop.
        //If the any other key is pressed, continue the loop 
        //If any key is not pressed withing 10 ms, continue the loop 
        if (waitKey(10) == 27)
        {
            cout << "Esc key is pressed by user. Stoppig the video" << endl;
            break;
        }
    }
    return 0;
    }

};

我已经使用以下命令在Matlab中编译了程序：

mex webcamCversion.cpp -I'C:\opencv\build\include\'

我希望看到网络摄像头feed会打开一个窗口，但是当我运行该程序的matlab版本时什么也没发生。