Invention Grant
- Patent Title: Reducing context coded and bypass coded bins to improve context adaptive binary arithmetic coding (CABAC) throughput
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Application No.: US16437277Application Date: 2019-06-11
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Publication No.: US10798384B2Publication Date: 2020-10-06
- Inventor: Vivienne Sze , Madhukar Budagavi
- Applicant: Texas Instruments Incorporated
- Applicant Address: US TX Dallas
- Assignee: Texas Instruments Incorporated
- Current Assignee: Texas Instruments Incorporated
- Current Assignee Address: US TX Dallas
- Agent Charles A. Brill; Frank D. Cimino
- Main IPC: H04N19/00
- IPC: H04N19/00 ; H04N19/13 ; H04N19/70 ; H04N19/91 ; H04N19/124 ; H04N19/60 ; H04N19/184

Abstract:
Techniques for context-adaptive binary arithmetic coding (CABAC) coding with a reduced number of context coded and/or bypass coded bins are provided. Rather than using only truncated unary binarization for the syntax element representing the delta quantization parameter and context coding all of the resulting bins as in the prior art, a different binarization is used and only part of the resulting bins are context coded, thus reducing the worst case number of context coded bins for this syntax element. Further, binarization techniques for the syntax element representing the remaining actual value of a transform coefficient are provided that restrict the maximum codeword length of this syntax element to 32 bits or less, thus reducing the number of bypass coded bins for this syntax element over the prior art.
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