Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1996 · 10 citations · 0 references
ComputingComputer ScienceComputer GraphicsComputer VisionDigital ImagingData CompressionDigital Image ProcessingImage CompressionImage ProcessingMotion EstimationRate-distortion TheoryCoding Scheme DesignControllabilityMotion CompensationRate-distortion BoundsRate-distortion CodingRate-distortion OptimizationRate-distortion TradeoffRegion-based Compression
A new region-based coding scheme is introduced. It uses generalized parabolic blending curves for contour coding which lead to visually preferable smooth contours and support good local controllability. A rate-distortion criterion is applied to decide which regions should be used for motion compensation and for optimizing the region contours. The conditions for optimal regions in a rate-distortion sense are derived. Simulation results are presented. A gain of about 2 dB in PSNR for region-based motion compensation with optimized regions over block-based motion compensation at very low bit-rates is reported.