SIGNIFICANCE MAP ENCODING AND DECODING USING PARTITION SELECTION

摘要

Methods of encoding and decoding for video data are describe in which significance maps are encoded and decoded using non-spatially-uniform partitioning of the map into parts, wherein the bit positions within each part are associated with a given context. Example partition sets and processes for selecting from amongst predetermined partition sets and communicating the selection to the decoder are described.

主权项

1. A method of encoding a significance map for a 4×4 transform unit using an image or video encoder, the method comprising:
determining a context for a bit position in the significance map based upon a partition set; encoding a significant coefficient flag in the position based on the determined context using context-adaptive encoding; and updating the context based on the significant coefficient flag, wherein the partition set assigns contexts to positions within the significance map such that
a different context is assigned to each position in an upper left quadrant of the significance map,contexts are shared by groups of two in an upper right and lower left quadrant of the significance map, anda single context is shared by all positions in the lower right quadrant of the significance map.