Method and apparatus for reordered binarization of syntax elements in CABAC

摘要

A method and apparatus of context-based adaptive binary arithmetic encoding/decoding for syntax elements of one or more blocks are disclosed. According to one embodiment of the present invention, the binarization results of the x and y positions of the last significant coefficient of a transform unit are reordered by collecting the bypass bins together. According to another embodiment of the present invention, binarization results of syntax elements from two or more of four Intra N×N prediction units, including prev_intra_luma_pred_flag, rem_intra_luma_pred_mode, and mpm_idx are reordered by collecting the bypass bins together. In yet another embodiment according to the present invention, the binarization results of other syntax elements are also reordered by collecting bypass bins together. Furthermore, the above reordering of binarization results may be used for binarization results corresponding to a block and its neighboring blocks.

主权项

1. A method of context-based adaptive binary arithmetic decoding for syntax elements of a coding unit, wherein the coding unit is partitioned into four PUs (prediction units) in an N×N intra prediction mode, the method comprising:
receiving in a circuit reordered bins comprising a first part and a second part, wherein the first part comprises regular bins associated with each of two or more PUs and the second part comprises first bypass bins or second bypass bins associated with said each of two or more PUs, wherein the first bypass bins are reordered by collecting bypass bins related to an index for a most probable mode associated with said two or more PUs together and the second bypass bins are reordered by collecting bypass bins related to a remaining prediction mode associated with said two or more PUs together; determining in a circuit a first codeword corresponding to a first syntax element for said each of two or more PUs, wherein the first codeword comprises the regular bins, and wherein the first syntax element corresponds to an indication of intra prediction mode selection for said each of two or more PUs; determining in a circuit a second codeword corresponding to a second syntax element for said each of two or more PUs if the indication corresponds to most-probable-mode coding, wherein the second syntax element corresponds to the index for a most probable mode, and wherein the second codeword comprises the first bypass bins; determining in a circuit a third codeword corresponding to a third syntax element for said each of two or more PUs if the indication corresponds to remaining-prediction-mode coding, wherein the third syntax element corresponds to the remaining prediction mode, wherein the third codeword comprises the second bypass bins; and providing by a circuit the first syntax element, the second syntax element and the third syntax element for said each of two or more PUs.