DirectX and OpenCV

So i have a program written already that captures the image from a webcam, into a vector called pBuffer. I can easily acess the RGB pixel information of each pixel, simply by pBuffer[i]=R;pBuffer[i+1]=G;Buffer[i+2]=B. No problem in here.

The next step is now create an IplImage* img, and fill it in with the information of the pBuffer...some sort of SetPixel.

There is a SetPixel Function on the web, that is :

(((uchar*)(image­>imageData + image­>widthStep*(y))))[x * image­>nChannels + channel] = (uchar)value; being the value the pBuffer information, x and y the pixel coordinates.However i simply cannot put this to work. Any ideas?? Is in C++.

From stackoverflow

• What you are trying to do you can do like this (assuming width and height are the image dimensions):

  CvSize size;
  size.height = height;
  size.width = width;
  IplImage* ipl_image_p = cvCreateImage(size, IPL_DEPTH_8U, 3);
  
  for (int y = 0; y < height; ++y)
      for (int x = 0; x < width; ++x)
          for (int channel = 0; channel < 3; ++channel)
              *(ipl_image_p->imageData + ipl_image_p->widthStep * y + x * ipl_image_p->nChannels + channel) = pBuffer[x*y*3+channel];
  

  However, you don't have to copy the data. You can also use your image data by IplImage (assuming pBuffer is of type char*, otherwise you need possibly to cast it):

  CvSize size;
  size.height = height ;
  size.width = width;
  IplImage* ipl_image_p = cvCreateImageHeader(size, IPL_DEPTH_8U, 3);
  ipl_image_p->imageData = pBuffer;
  ipl_image_p->imageDataOrigin = ipl_image_p->imageData;
  

  Dani van der Meer : BYTE is a typedef for unsigned char, so you can safely cast it to char. So the code it becomes: ipl_image_p->imageData = (char*)pBuffer;

  Dani van der Meer : I'm not sure. But you can try change ipl_image_p->origin. It should be 0 or 1. Try both and see what happends.

  Dani van der Meer : We use OpenCV for developing computer vision software. So I learned by doing. I have actually a book called "learning OpenCV". People say it is good. I didn't have time to read it yet... Good luck with your thesis!

  Zeus : I used OpenCV in my Masters thesis too... good luck! :)