Opencv视频帧给我一个错误 [英] Opencv video frame giving me an error

问题描述

尝试对视频上的帧执行灰度变换，但是当我到达cvCvtColor时，仍然收到断言失败的错误。
有人看到我的错误是在哪里？

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<<"\n";
//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);

}

推荐答案

实际上，问题是 cvCvtColor（）与 CV_RGB2GRAY 期望输出图像 nChannels == 1 。

要解决此问题，您必须将复制过程调整为：

To solve the issue, you must adjust your copy procedure to:

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

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