High Throughput CBAC Hardware Encoder With Bin Merging for AVS 2.0 Video Coding

Context-based binary arithmetic coding (CBAC) is an entropy coder of AVS 2.0, the latest Chinese video compression standard for 8K ultra-high-definition (UHD) video, which employs a logarithmic number system to avoid multiplication operations for range updates for binary arithmetic coding (BAE). In...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems for video technology Vol. 31; no. 11; pp. 4439 - 4453
Main Authors: Choi, Young-Kyu, Lee, Hyuk-Jae, Chae, Soo-Ik
Format: Journal Article
Language:English
Published: New York IEEE 01.11.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Arithmetic coding
AVS
binary arithmetic encoder (BAE)
Binary codes
Bins
Coders
Context
Context modeling
context-based binary arithmetic coding (CBAC)
Encoding
entropy coding
Gate counting
Hardware
hardware implementation
High definition
Lookup tables
Merging
Multiplication
Number systems
Pipelines
Pipelining (computers)
Probability
Throughput
Video compression
ISSN:1051-8215, 1558-2205
Online Access:Get full text
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Summary:Context-based binary arithmetic coding (CBAC) is an entropy coder of AVS 2.0, the latest Chinese video compression standard for 8K ultra-high-definition (UHD) video, which employs a logarithmic number system to avoid multiplication operations for range updates for binary arithmetic coding (BAE). In this paper, we propose a high-throughput CBAC hardware encoder for 8K UHD. To enhance its throughput, we introduce a bin-merging technique that converts a subsequence of bins into a merged bin without affecting the functionality of the CBAC encoder. Moreover, we also employ a 4-stage pipeline architecture for CBAC and lookup tables for context updates. Consequently, the proposed CBAC encoder can process about 3.94 bins per cycle and achieve a throughput of 2.9 Gbins per second. When synthesized in a TSMC 65nm LP process, it operates up to 735 MHz and the total gate count is 182.5 K. To the best of our knowledge, this is the highest throughput for a CBAC encoder.
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ISSN:1051-8215
1558-2205
DOI:10.1109/TCSVT.2020.3047925