Context-adaptive binary arithmetic coding
- Context-adaptive binary arithmetic coding
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Context-adaptive binary arithmetic coding (CABAC) is a form of entropy coding used in H.264/MPEG-4 AVC video encoding. It is a lossless compression technique. It is notable for providing much better compression than most other encoding algorithms used in video encoding, and is one of the primary advantages of the H.264/AVC encoding scheme. CABAC is only supported in Main and higher profiles and requires a large amount of processing to decode compared to similar algorithms. It is also difficult to parallelize and vectorize. As a result, Context-adaptive variable-length coding (CAVLC), a lower efficiency entropy encoding scheme, is used to increase performance on slower playback devices.
Algorithm
CABAC has multiple probability modes for different contexts. It first converts all non-binary symbols to binary. Then, for each bit, the coder selects which probability model to use, then uses information from nearby elements to optimize the probability estimate. Arithmetic coding is finally applied to compress the data.
References
- H.264/MPEG-4 Part 10 White Paper, two page summary of MPEG CABAC, October 2002 [1]
- E. G. Richardson, Iain (2003). H.264 and MPEG-4 Video Compression: Video Coding for Next-generation Multimedia. Chichester: John Wiley & Sons Ltd..
External links
See also
Wikimedia Foundation.
2010.
Look at other dictionaries:
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