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Index › Programming Questions & Help › Video Capture,  Movie Playback,  Vision Libraries › Applying convex filters to the capture stream..
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Applying convex filters to the capture stream.. (Read 955 times)
demaws
Applying convex filters to the capture stream..
Oct 3rd, 2007, 10:29am  
Hey Everyone,

I was trying to apply some image filters on the incoming capture stream. Specifically, I wanted to apply convex (fisheye) / concave filters to emulate these mirrors using processing. Google wasn't very helpful. Nor were the searches on the searches on these forums. Any ideas on how I could go about it? Any input would be really helpful.

I see two ways in which I could do this. Apply filters to individual frames from the stream. Render each frame on a sphere of adjusted radius (SurfaceLib). The latter one is pretty involved and this needs to be a quick job. Pour in any other suggestion that you have.

Thanks,
demaws
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nitelite
Re: Applying convex filters to the capture stream.
Reply #1 - Oct 17th, 2007, 12:40pm  
I did some quick googling and found this example implementation of a fisheye effect:
http://www.jasonwaltman.com/thesis/filter-fisheye.html

It uses polar coordinates instead of cartesian ("normal"), so you might have to read up on that too ...

http://en.wikipedia.org/wiki/Polar_coordinates#Converting_between_polar_and_Cartesian_coordinates

Smiley Hope this helps
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