May be you know what is Apple Core Image? Copied from Wikipedia - "Core Image is a pixel-accurate, near-realtime, non-destructive image processing technology in Mac OS X. Implemented as part of the QuartzCore framework of Mac OS X 10.4 and later, Core Image provides a plugin-based architecture for applying filters and effects within the Quartz graphics rendering layer."
Latest few month i'm working to implementation CoreImage like technology (GPU-based image processing using DirectX Pixel Shader effects) on Windows platform. Now i get good result. This is link to demo program (require Pixel Shader 2.0 support video card - low-end video card at this time):
Soon i offer this work as Delphi Component Library. I can said - image processing performance is very very good. About 5-10x faster CPU version on Intel building video.