Coding method of transform coefficient, decoding method of transform coefficient, and device

Abstract

The embodiment of the invention discloses a coding method for transform coefficients, a decoding method for transform coefficients, and a device. Take the encoding method as an example: encode the transform coefficients of the transform coefficient block according to the preset scanning order, and encode a set number of transform coefficients for each group until the last group of the transform coefficient block is encoded; store the obtained The distribution of non-zero transformation coefficients, the absolute value of the transformation coefficients, and the sign of the non-zero transformation coefficients; during the last group of encoding, after obtaining the distribution of non-zero transformation coefficients of the last group of encoding, the stored non-zero transformation coefficients distribution and the distribution of the last group of coded non-zero transform coefficients into the code stream, and after obtaining the absolute value of the last group of coded transform coefficients and the sign of the non-zero transform coefficients, the absolute value of the stored transform coefficients The value and the sign of the non-zero transform coefficients and the absolute value of the last group of coded transform coefficients and the sign of the non-zero transform coefficients are encoded into the bitstream. Encoding and decoding efficiency can be improved.

Description

technical field [0001] The present invention relates to the technical field of video processing, in particular to a method for encoding transform coefficients, a method for decoding transform coefficients, and a device. Background technique [0002] Entropy coding in current video coding technology mainly adopts run-length coding and arithmetic coding. For example, context-based variable length coding (Context Adaptive Variable Length Coder, CAVLC) and adaptive binary arithmetic coding ( Context Adaptive Binary Arithmetic Coder (CABAC) two entropy coding modes, these two entropy coding modes make full use of the correlation between the coded information and the current coded information, specifically: use the coded information to construct the code table or probability of the current coded information model, which is called context-based entropy coding. Because CABAC adopts the idea of ​​arithmetic coding, its coding performance is better than that of CAVLC, but correspondi...

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Problems solved by technology

Due to the above-mentioned scanning sequence is different, it is necessary to execute the reading data once in the encoding process of executing step A and executing B~D respectively, and the decoding end also needs to solidify two table lookup methods corresponding to these two sequences, resulting in high encoding and decoding efficiency overhead. low efficiency

In addition, in step A, if the transform coefficient block is relatively large, usually called a large transform unit, for example, the 32x32 significance map will be relatively large, so the burden of encoding a large significance map in hardware design is relatively large

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