A nonlinear loop filter for quantization noise removal in hybrid video compression

摘要: We propose a high-performance, nonlinear, loop filter that reduces quantization noise over video frames composed of locally uniform regions (smooth, high frequency, texture, etc.) separated by singularities. Unlike earlier work, the designed is not limited to block based transform coders and provides robust solution for intra as well differentially encoded frames. Our formulation on sparse decompositions allows us take advantage spatial dependencies inherent in while incorporating temporal through information provided previously decoded The proposed results 10% improvements rate (at typical distortions) combination with significant visual quality improvements, especially around