Adaptive cross-component sample offset filtering parameters

Abstract

This disclosure describes a set of advanced video coding technologies and is particular related to cross-component sample offset (CCSO) filtering of reconstructed samples. For example, CCSO filter parameters may be allowed to vary from a filtering unit to another filtering unit. A filtering unit may be a filtering block or a filtering region containing multiple spatially adjacent filtering blocks in a reconstructed frame. Corresponding allowed options of CCSO filter parameter combinations may be specified. Each filtering unit may select from the allowed combination options. The selected combination options may be signaled in the bitstream or derived in some other manners. Allowing such CCSO filter parameter variation within a frame may provide filtering quality gain that outweighs a cost of overhead in signaling.