Tiling with Different Spatial Resolutions for Pseudo Real-Time Video Processing Library RaVioli

The performance of general purpose computers is increasing rapidly, and now they are capable of running video processing applications. However, on general purpose operating systems, real-time video processing is still difficult because there is no guarantee that enough CPU resources can surely be provided. A pseudo real-time video processing library RaVioli has been proposed for solving this issue. RaVioli conceals two resolutions, frame rate and number of pixels, from programmers and provides a dynamic and transparent resolution adjustability. Using RaVioli, pseudo real-time video processing can be achieved easily, but output precision may be roughened for reducing processing load. To prevent this situation, this paper proposes a method for automatically dividing whole video frame into several sub frames, or tiles, and changing the resolutions of each tile individually. We have implemented the method on RaVioli and have made some evaluations with a sample program. The result shows that the proposed method can keep the resolution of video frames higher than traditional RaVioli.