Quantitative mode, image encoding, decoding method, encoder, decoder and system

Abstract

The invention relates to a method for encoding / decoding quantitative mode, a method for encoding / decoding an image, an encoder, a decoder and a system, wherein the method for encoding the quantitative mode comprises: obtaining a quantitative mode code stream value according to the quantitative mode of a current encoding block; and writing the quantitative mode code stream value into image code stream; the method for encoding the image comprises: determining the quantitative mode of the current encoding block in an input image; zooming or quantifying the current encoding block according to thequantitative mode to obtain the current encoding block data after quantification; obtaining a quantitative mode code stream value according to the quantitative mode of a current encoding block; and encoding the quantified current encoding block data to obtain image code stream, and writing the quantitative mode code stream value into image code stream. The invention writes the determined current encoding block quantitative mode into encoding data, does not need perform quantitative mode decision at the decoder end, and directly decodes to obtain current block quantitative mode, so as to reduce calculation burden and realizing cost of the decoder.

Description

Technical field [0001] The embodiments of the present invention relate to coding and decoding technologies, and in particular to a quantization mode, image coding, decoding method, encoder, decoder, and system. Background technique [0002] In the image coding and decoding technology, the coding of the image usually requires the image to be divided into coding blocks before coding. For the image divided into coded blocks, the corresponding block transform coefficients will be obtained through orthogonal transform processing, and the block transform coefficients will be quantized and rounded to calculate, and entropy coding can finally obtain the compressed and coded bit stream corresponding to the image , So as to achieve the image encoding operation. [0003] Because the image content in a sequence is not exactly the same, but there will be major changes, that is, the details of the images in the same image sequence are different, so if the same quantization matrix is ​​used for ...

AI Technical Summary

Problems solved by technology

[0017] (1) Encoder 1 and decoder 6 both include a quantization mode decision-making module, that is, both encoding and decoding methods need to implement a quantization mode decision-making algorithm, which increases the computational burden and implementation cost of the decoder;

[0018] (2) The decision-making algorithm of the fixed quantization mode determines the result of the quantization mode, making the encoding method inflexible

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