Unavailable synchronous data

thomas11live.com.sg

Dear All,
I have OpenCV image, get the image data from the Queue.

IplImage *opcvImg = cvCreateImage(cvSize(col_size, row_size), IPL_DEPTH_8U,1);
opcvImg = ImageQueue::getQueue();
Upto here, in the watch window I can see that opcvImg has all information.

But when I convert the IplImage* to cv::Mat as
Mat matData(opcvImg, true);
OR
Mat matData = cvarrToMat(opcvImg);
matData in the watch window shows Unavailable syschronous data.

Let me put in some more information, actually the code runs in a separate thread as follow

@void processingbyWatershed::run()
{
IplImage *opcvImg = cvCreateImage(cvSize(col_size, row_size), IPL_DEPTH_8U,1);

while(1)
{

    if(!ImageQueue::isEmpty())
    {
         opcvImg = ImageQueue::getQueue(); 
        Mat original(opcvImg, true);
        //Mat original = cvarrToMat(opcvImg);
    }
}

}@
What could be the problem?
Thanks

sierdzio

This does not look like Qt-related problem. You would probably be better off asking this on OpenCV-related forum or mailing list.

thomas11live.com.sg

No, my query is can I have a hint of what are the possible causes of making matData to be Unavailable syschronous data.

lgeyer

What version of QtCreator / GCC / GDB are you using?

thomas11live.com.sg

I am using QT Creator 2.4.1

lgeyer

Try upgrading to 2.6+ and a recent GDB (as for example distributed with "MinGW-builds":http://sourceforge.net/projects/mingwbuilds/). There are known problems with older versions of GDB which result in the error you've mentioned.