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POHow to convert an OpenCV IplImage to an SDL_Surface?
 

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  1. POHow to convert an OpenCV IplImage to an SDL_Surface?
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    <p>I'm trying to write a program which takes an <code>SDL_Surface</code>, converts it to an <code>IplImage</code>, uses the cvBlobsLib to find blobs, paints the blobs as spots back over the image, then converts the output <code>IplImage</code> back to an <code>SDL_Surface</code>.</p> <p>I'm almost done: only converting the <code>IplImage</code> back to an <code>SDL_Surface</code> hasn't been done yet. This IplImage has 3 image channels and is 8 bits per pixel. I think I have two calls I can use:</p> <pre><code>SDL_Surface *SDL_CreateRGBSurface(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask); SDL_Surface *SDL_CreateRGBSurfaceFrom(void *pixels, int width, int height, int depth, int pitch, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask); </code></pre> <p>I'm currently trying with <code>SDL_CreateRGBsurfaceFrom</code>. I have no idea, however, what the correct values of pitch, Rmask, Gmask and Bmask are. (Amask is 0, because there is no alpha channel.)</p> <p>Could anybody help me out by explaining how to do this?</p> <p>Thanks!</p> <p><b>Edit</b>: For example, this is code I tried to use:</p> <pre><code>SDL_Surface *ipl_to_surface (IplImage *opencvimg) { int pitch = opencvimg-&gt;nChannels*opencvimg-&gt;width; printf("Depth %d, nChannels %d, pitch %d\n", opencvimg-&gt;depth, opencvimg-&gt;nChannels, pitch); SDL_Surface *surface = SDL_CreateRGBSurfaceFrom((void*)opencvimg-&gt;imageData, opencvimg-&gt;width, opencvimg-&gt;height, opencvimg-&gt;depth, pitch, 0x0000ff, 0x00ff00, 0xff0000, 0 ); return surface; } </code></pre> <p>(SDL Documentation writes "Pitch is the size of the scanline of the surface, in bytes, i.e. widthInPixels*bytesPerPixel.") This outputs "Depth 8, nChannels 3, pitch 1920" and displays a completely red image. I <em>think</em> a solution would be to convert my 8-bits image to 24-bits (1 byte per channel), but I don't know how to do that. Any ideas?</p>
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    1. COYour image is 8 bits per pixel with 3 channels? Did you mean 24 bits per pixel, since that's what the RGB masks you specified seems to suggest?
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    2. CONo, it's the other way around: the RGB masks I specified are wrong. The image is really 8 bits per pixel with 3 channels. I'm going to try this code now: http://paster.dazjorz.com/?p=3705
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    3. COYeah your best bet would be to convert it to 24 bit or 32 bit since I don't think SDL handles non-standard bit depths too well.
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