Question

Trying to perform grayscale transformation on frames on a video ,but keep getting Assertation failed error when I get to cvCvtColor. Does anyone see where my error is?

    IplImage *frame, *frame_copy = 0;

// capture frames from video
CvCapture *capture = cvCaptureFromFile( "lightinbox1.avi");
//Allows Access to video propertys
cvQueryFrame(capture);

//Get the number of frames
int nframe=(int) cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_COUNT);

    //Name window
cvNamedWindow( "video:", 1 );

    //start loop
for(int i=0;i<nframe;i++){
//prepare capture frame extraction
cvGrabFrame(capture);
cout<<"We are on frame "<<i<<"
";
//Get this frame
frame = cvRetrieveFrame( capture );
con2txt(frame);
    frame_copy = cvCreateImage(cvSize(frame->width,frame->height),IPL_DEPTH_8U,frame->nChannels );
//show and destroy frame
    cvCvtColor( frame,frame,CV_RGB2GRAY);

cvShowImage("video:",frame);
cvWaitKey(33);}
cvReleaseCapture(&capture);

iii

Answer 1

事实上,问题在于,cvCvtColor() with CV_RGB2GRAY的输出形象预期为。频道=1。

为了解决这个问题,你必须调整你的复印程序,以便:

frame_copy = cvCreateImage(cvSize(frame->width,frame->height), IPL_DEPTH_8U, 1);
cvCvtColor(frame, frame_copy, CV_RGB2GRAY);

Answer 2

页: 1

由于<代码>cvCvtColor,必须改变图像中的频道数量,以便把rg化成灰色。

电话:cvtColor,新形象为目的地。

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