OpenCV Image to QImage

[kaszewczyk]

Hello I have a quick question.

Im trying to do some object tracking with OpenCv library, and at one point I wanted to display a thresholded image, but what I got is black square.
Here is code:

QImage Camera::captureTrasholdedImage()
{
    IplImage* frame = cvQueryFrame( this->captureHandle );
    IplImage* frameHSV = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3);
    cvCvtColor(frame, frameHSV, CV_BGR2HSV);
 
 
    IplImage* trashold = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 1);
    cvInRangeS(frame, cvScalar(170, 160, 160), cvScalar(180,256, 256), trashold);
 
 
 
    QByteArray buff(trashold->imageData, trashold->imageSize);
 
    int  height = trashold->height;
    int  width = trashold->width;
 
    QPixmap pix(width, height);
    pix.loadFromData(buff);
    return pix.toImage();
}

QImage Camera::captureTrasholdedImage()
{
    IplImage* frame = cvQueryFrame( this->captureHandle );
    IplImage* frameHSV = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 3);
    cvCvtColor(frame, frameHSV, CV_BGR2HSV);


    IplImage* trashold = cvCreateImage(cvGetSize(frame), IPL_DEPTH_8U, 1);
    cvInRangeS(frame, cvScalar(170, 160, 160), cvScalar(180,256, 256), trashold);



    QByteArray buff(trashold->imageData, trashold->imageSize);

    int  height = trashold->height;
    int  width = trashold->width;

    QPixmap pix(width, height);
    pix.loadFromData(buff);
    return pix.toImage();
}

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Can someone give me a hint please ?