qimage to iplimage

[jack1989]

hi i am quite new to Qt, and i am stuck in a problem regarding converting a Qimage to Iplimage in my program,
can anyone help me with this

[JohannesMunk]

Never used OpenCV / IplImage before but google revealed this:

http://www.c-plusplus.de/forum/viewt...art-is-10.html

IplImage *img= ... 
 
QImage *image= new QImage(img->width, img->height,  QImage::Format_RGB32); 
 
for (int y=0;y<img->height;y++) 
{ 
  unsigned int *dst= (unsigned int*)image->scanLine(y); 
  unsigned char *src= (unsigned char*)img->imageData +  y*img->width*3; 
  for (int x=0;x<img->width;x++,src+=3) 
  { 
    *dst++= src[0] | (src[1]<<8) | (src[2]<<16) |  (0xff<<24); 
  } 
}

IplImage *img= ... 
 
QImage *image= new QImage(img->width, img->height,  QImage::Format_RGB32); 
 
for (int y=0;y<img->height;y++) 
{ 
  unsigned int *dst= (unsigned int*)image->scanLine(y); 
  unsigned char *src= (unsigned char*)img->imageData +  y*img->width*3; 
  for (int x=0;x<img->width;x++,src+=3) 
  { 
    *dst++= src[0] | (src[1]<<8) | (src[2]<<16) |  (0xff<<24); 
  } 
}

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You just have to turn it around and make sure the destination format is right.. And you may need to adapt the pixel stride (src+=3 ) to whatever your source is.. look for uses of scanLine.

Johannes

[jack1989]

hi here is a code snippet of function i am usin to convert QImage to IplImage, but it gives the error : Invalid parameter passed to C runtime function.
IplImage* ImageViewer::convertToIplImage(QImage *qImage)
{
cvNamedWindow("win1",CV_WINDOW_AUTOSIZE);
IplImage* cvImage;
cvImage = cvCreateImageHeader(cvSize(qImage->width(), qImage->height()), IPL_DEPTH_8U, 4);
cvImage->imageData = (char*)qImage->bits();
IplImage* colorImage = cvCreateImage( cvGetSize(cvImage), 8, 3 );
cvConvertImage( cvImage, colorImage, 0 );
cvShowImage("win1",colorImage);
cvWaitKey(0);

// if(!cvSaveImage("cvImage.bmp", cvImage)) printf("Could not save: cvImage.bmp in qtToCv");

return colorImage;
//return x;

}

can anyone tell me whats going wrong