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- Context-adaptive_variable-length_coding abstract "Context-adaptive variable-length coding (CAVLC) is a form of entropy coding used in H.264/MPEG-4 AVC video encoding. It is an inherently lossless compression technique, like almost all entropy-coders. In H.264/MPEG-4 AVC, it is used to encode residual, zig-zag order, blocks of transform coefficients. It is an alternative to context-based adaptive binary arithmetic coding (CABAC). CAVLC requires considerably less processing to decode than CABAC, although it does not compress the data quite as effectively. CAVLC is supported in all H.264 profiles, unlike CABAC which is not supported in Baseline and Extended profiles.CAVLC is used to encode residual, zig-zag ordered 4x4 (and 2x2) blocks of transform coefficients. CAVLC is designed to take advantage of several characteristics of quantized 4x4 blocks: After prediction, transformation and quantization, blocks are typically sparse (containing mostly zeros). The highest non-zero coefficients after zig-zag scan are often sequences of +/- 1. CAVLC signals the number of high-frequency +/-1 coefficients in a compact way. The number of non-zero coefficients in neighbouring blocks is correlated. The number of coefficients is encoded using a look-up table; the choice of look-up table depends on the number of non-zero coefficients in neighbouring blocks. The level (magnitude) of non-zero coefficients tends to be higher at the start of the reordered array (near the DC coefficient) and lower towards the higher frequencies. CAVLC takes advantage of this by adapting the choice of VLC look-up table for the “level” parameter depending on recently coded level magnitudes.".
- Context-adaptive_variable-length_coding thumbnail 4x4CAVLC.svg?width=300.
- Context-adaptive_variable-length_coding wikiPageExternalLink h264_vlc.pdf.
- Context-adaptive_variable-length_coding wikiPageID "9058366".
- Context-adaptive_variable-length_coding wikiPageLength "4657".
- Context-adaptive_variable-length_coding wikiPageOutDegree "13".
- Context-adaptive_variable-length_coding wikiPageRevisionID "577950235".
- Context-adaptive_variable-length_coding wikiPageWikiLink Category:Lossless_compression_algorithms.
- Context-adaptive_variable-length_coding wikiPageWikiLink Category:MPEG.
- Context-adaptive_variable-length_coding wikiPageWikiLink Category:Video_compression.
- Context-adaptive_variable-length_coding wikiPageWikiLink Context-adaptive_binary_arithmetic_coding.
- Context-adaptive_variable-length_coding wikiPageWikiLink Context-based_adaptive_binary_arithmetic_coding.
- Context-adaptive_variable-length_coding wikiPageWikiLink Data_compression.
- Context-adaptive_variable-length_coding wikiPageWikiLink Entropy_coding.
- Context-adaptive_variable-length_coding wikiPageWikiLink Entropy_encoding.
- Context-adaptive_variable-length_coding wikiPageWikiLink H.264.
- Context-adaptive_variable-length_coding wikiPageWikiLink MPEG-4_AVC.
- Context-adaptive_variable-length_coding wikiPageWikiLink Lossless_compression.
- Context-adaptive_variable-length_coding wikiPageWikiLink Variable-length_code.
- Context-adaptive_variable-length_coding wikiPageWikiLink File:4x4CAVLC.svg.
- Context-adaptive_variable-length_coding wikiPageWikiLinkText "CAVLC".
- Context-adaptive_variable-length_coding wikiPageWikiLinkText "Context-adaptive variable-length coding (CAVLC)".
- Context-adaptive_variable-length_coding wikiPageWikiLinkText "Context-adaptive variable-length coding".
- Context-adaptive_variable-length_coding wikiPageWikiLinkText "context-adaptive variable-length coding".
- Context-adaptive_variable-length_coding hasPhotoCollection Context-adaptive_variable-length_coding.
- Context-adaptive_variable-length_coding wikiPageUsesTemplate Template:Compu-sci-stub.
- Context-adaptive_variable-length_coding subject Category:Lossless_compression_algorithms.
- Context-adaptive_variable-length_coding subject Category:MPEG.
- Context-adaptive_variable-length_coding subject Category:Video_compression.
- Context-adaptive_variable-length_coding hypernym Form.
- Context-adaptive_variable-length_coding type Algorithm.
- Context-adaptive_variable-length_coding comment "Context-adaptive variable-length coding (CAVLC) is a form of entropy coding used in H.264/MPEG-4 AVC video encoding. It is an inherently lossless compression technique, like almost all entropy-coders. In H.264/MPEG-4 AVC, it is used to encode residual, zig-zag order, blocks of transform coefficients. It is an alternative to context-based adaptive binary arithmetic coding (CABAC).".
- Context-adaptive_variable-length_coding label "Context-adaptive variable-length coding".
- Context-adaptive_variable-length_coding sameAs Context-adaptive_variable-length_coding.
- Context-adaptive_variable-length_coding sameAs Context_Adaptive_Variable_Length_Coding.
- Context-adaptive_variable-length_coding sameAs Context-Adaptive_Variable_Length_Coding.
- Context-adaptive_variable-length_coding sameAs Context-adaptive_variable-length_coding.
- Context-adaptive_variable-length_coding sameAs m.027w4k9.
- Context-adaptive_variable-length_coding sameAs Q1128721.
- Context-adaptive_variable-length_coding sameAs Q1128721.
- Context-adaptive_variable-length_coding sameAs CAVLC.
- Context-adaptive_variable-length_coding wasDerivedFrom Context-adaptive_variable-length_coding?oldid=577950235.
- Context-adaptive_variable-length_coding depiction 4x4CAVLC.svg.
- Context-adaptive_variable-length_coding isPrimaryTopicOf Context-adaptive_variable-length_coding.