Question

I hope you could help me.

I’ m using QT and try to do a simple detection of edges on a image. But my program crash when i launch

cv::GaussianBlur( src, src, cv::Size(3,3), 0, 0, cv::BORDER_DEFAULT );

or

cv::Sobel( src_gray, grad_x, ddepth, 1, 0, 3, scale, delta, cv::BORDER_DEFAULT );

here is my code:

QImage      *image1;    
IplImage    *cv_image1;

image1 = new QImage("./image.png");  // Format is ARGB32
cv_image1 = QImage2IplImage(image1);
cv::Mat src(cv_image1);

cv::imshow(window_name, src); // Work Well
cv::Mat src_gray;
int scale = 1;
int delta = 0;
int ddepth = CV_16S;

cv::GaussianBlur(src, src, cv::Size(3,3), 0, 0, cv::BORDER_DEFAULT); //Crash Here
cv::imshow( window_name, src);

I think that was a problem of format.
But in another program with QIMAGES in ARGB32 this code work well.
Thank you.

Answer 1

I Found a solution.
That’ s weird but when I do:

cvtColor(src, src_gray, CV_RGB2GRAY );
cv::Sobel(src_gray, grad_x, ddepth, 1, 0, 3, scale, delta, cv::BORDER_CONSTANT);

without the cv::GaussianBlur it works well. I just change the last parameter to cv::BORDER_CONSTANT