c++ - OpenCV : How to display webcam capture in windows form application?

Question

通常我们在 opencv 窗口中显示网络摄像头或视频运动:

      CvCapture* capture = cvCreateCameraCapture(0);
            cvNamedWindow( "title", CV_WINDOW_AUTOSIZE );
   cvMoveWindow("title",x,y);
   while(1) 
   {
    frame = cvQueryFrame( capture );
    if( !frame )
    {
     break;
    }
    cvShowImage( "title", frame );
    char c = cvWaitKey(33);
    if( c == 27 )
    {
     break;
    }
   }

我尝试使用 pictureBox 成功地在 Windows 窗体中显示图像:

 pictureBox1->Image = gcnew System::Drawing::Bitmap( image->width,image->height,image->widthStep,System::Drawing::Imaging::PixelFormat::Undefined, ( System::IntPtr ) image-> imageData);

但是当我试图显示从视频中捕获的图像时它不会工作，这是来源:

            CvCapture* capture = cvCreateCameraCapture(0);
   while(1) 
   {
    frame = cvQueryFrame( capture );
    if( !frame )
    {
     break;
    }
    pictureBox1->Image = gcnew System::Drawing::Bitmap( frame->width,frame->height,frame->widthStep,System::Drawing::Imaging::PixelFormat::Undefined, ( System::IntPtr ) frame-> imageData);
    char c = cvWaitKey(33);
    if( c == 27 )
    {
     break;
    }
   }

有没有办法使用 windows 窗体而不是 opencv windows 来显示视频或网络摄像头？

还是我的代码有问题？ 感谢您的帮助..:)

Answer 1

一条建议:使用VideoInput而不是 CvCapture(CvCapture 是 highgui 库的一部分，它不是用于生产用途，而是用于快速测试)。是的，VideoInput 主页看起来很奇怪，但是这个库非常值得。

这里是使用 VideoInput 的快速示例(从 VideoInput.h 文件中提取):

//create a videoInput object
videoInput VI;

//Prints out a list of available devices and returns num of devices found
int numDevices = VI.listDevices();  

int device1 = 0;  //this could be any deviceID that shows up in listDevices
int device2 = 1;  //this could be any deviceID that shows up in listDevices

//if you want to capture at a different frame rate (default is 30) 
//specify it here, you are not guaranteed to get this fps though.
//VI.setIdealFramerate(dev, 60);    

//setup the first device - there are a number of options:

VI.setupDevice(device1);                          //setup the first device with the default settings
//VI.setupDevice(device1, VI_COMPOSITE);              //or setup device with specific connection type
//VI.setupDevice(device1, 320, 240);                  //or setup device with specified video size
//VI.setupDevice(device1, 320, 240, VI_COMPOSITE);  //or setup device with video size and connection type

//VI.setFormat(device1, VI_NTSC_M);                 //if your card doesn't remember what format it should be
                                                    //call this with the appropriate format listed above
                                                    //NOTE: must be called after setupDevice!

//optionally setup a second (or third, fourth ...) device - same options as above
VI.setupDevice(device2);                          

//As requested width and height can not always be accomodated
//make sure to check the size once the device is setup

int width   = VI.getWidth(device1);
int height  = VI.getHeight(device1);
int size    = VI.getSize(device1);

unsigned char * yourBuffer1 = new unsigned char[size];
unsigned char * yourBuffer2 = new unsigned char[size];

//to get the data from the device first check if the data is new
if(VI.isFrameNew(device1)){
    VI.getPixels(device1, yourBuffer1, false, false);   //fills pixels as a BGR (for openCV) unsigned char array - no flipping
    VI.getPixels(device1, yourBuffer2, true, true);     //fills pixels as a RGB (for openGL) unsigned char array - flipping!
}

//same applies to device2 etc

//to get a settings dialog for the device
VI.showSettingsWindow(device1);


//Shut down devices properly
VI.stopDevice(device1);
VI.stopDevice(device2);