VIDEO DECODER WITH ENHANCED CABAC DECODING

摘要

A decoder receives a bitstream containing quantized coefficients representative of blocks of video representative of a plurality of pixels and decodes the bitstream using context adaptive binary arithmetic coding. The context adaptive binary arithmetic coding decodes the current syntax element using the first mode if the current syntax element is intra-coded and selects between a first set of probable modes and a second set of probable modes, where the first set of probable modes are more likely than the second set of probable modes. The context adaptive binary arithmetic coding decodes the current syntax element using the second mode if the current syntax element is intra-coded and if selected from among one of the second set of probable modes.

主权项

1. A decoder to decode information, wherein the decoder comprises a regular decoding engine and a bypass decoding engine, the regular decoding engine for arithmetic decoding using a context, the bypass decoding engine for arithmetic decoding which does not use the context, and wherein the decoder is configured to:
decode a flag via the regular decoding engine for a prediction mode of a current block, wherein the flag indicates that the prediction mode of the current block is selected from either a most probable mode list of prediction modes or a not most probable mode list of prediction modes, the most probable mode list comprises at least one prediction mode of at least one available adjacent block of the current block, and wherein the not most probable mode list is different from the most probable mode list; and derive the prediction mode according to a value of the flag, wherein when the value of the flag is equal to a first value, the prediction mode is selected from the most probable mode list of prediction modes using a first information that is decoded via the bypass decoding engine, wherein when the value of the flag is equal to a second value, the prediction mode is selected from the not most probable mode list of prediction modes using a second information that is decoded via the bypass decoding engine, and wherein the first value is different from the second value.