c - 如何将帧复制到帧

Question

一个变量怎么能在一帧到另一帧的那种复制，就不是内存管理问题了

例如:

iplimage *frame = NULL;
iplimage *Temp_frame = NULL;

while(1) {
frame = cvQueryFrame( capture );

if( !frame ) break;

    Temp_frame=cvcloneimage(frame);

    cvreleaseImage(&Temp_frame);

    cvreleaseImage(&frame);
}

错误:

打开 cv.exe 中 0x75b39673 处出现未处理的异常:Microsoft C++ 异常:内存位置 0x0015f250 处的 cv::Exception..

请帮忙。

Answer 1

iplimage *frame = NULL;
iplimage *Temp_frame = NULL;

while(1) 
{
    frame = cvQueryFrame(capture);    
    if (!frame) 
        break;

    if (!Temp_frame) // creates Temp_frame only once
        Temp_frame = cvCreateImage(cvGetSize(frame), frame->depth, frame->nChannels);    

    cvCopy(frame , Temp_frame, NULL);

    // DO NOT RELEASE the return of cvQueryFrame()!
    // I believe that's what crashing your application.
    //cvreleaseImage(&frame);
}

// Since the size of "frame" won't change, there's no need to to create/release 
// Temp_frame on every iteration of the loop. So we release it at the end:
cvReleaseImage(&Temp_frame);