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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 wikiPageRevisionID "577950235".
- Context-adaptive_variable-length_coding hasPhotoCollection Context-adaptive_variable-length_coding.
- 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 type Abstraction100002137.
- Context-adaptive_variable-length_coding type Act100030358.
- Context-adaptive_variable-length_coding type Activity100407535.
- Context-adaptive_variable-length_coding type Algorithm105847438.
- Context-adaptive_variable-length_coding type Event100029378.
- Context-adaptive_variable-length_coding type LosslessCompressionAlgorithms.
- Context-adaptive_variable-length_coding type Procedure101023820.
- Context-adaptive_variable-length_coding type PsychologicalFeature100023100.
- Context-adaptive_variable-length_coding type Rule105846932.
- Context-adaptive_variable-length_coding type YagoPermanentlyLocatedEntity.
- 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 "CAVLC".
- Context-adaptive_variable-length_coding label "Context Adaptive Variable Length Coding".
- Context-adaptive_variable-length_coding label "Context-Adaptive Variable Length Coding".
- Context-adaptive_variable-length_coding label "Context-adaptive variable-length coding".
- 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 m.027w4k9.
- Context-adaptive_variable-length_coding sameAs Q1128721.
- Context-adaptive_variable-length_coding sameAs Q1128721.
- Context-adaptive_variable-length_coding sameAs Context-adaptive_variable-length_coding.
- 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.
