A Method of Video Coding 8x8 Integer Transformation

Abstract

An 8×8 integer transform method in video coding is disclosed by the present invention, which includes: receiving 8×8 image residual error data X output by a prediction module of a coder; selecting different integer transform bases [15, 15, 10, 3], [6, 7, 5, 1] to construct a transform matrix P; according to the transform matrix P, constructing a scaling matrix PF=ZT*Z; performing forward transform on the image residual error data X according to Y=PXPT, and adopting corresponding integer transform calculation method according to the different integer transform bases; and performing scaling processing on the 8×8 forward transformed data Y. The transform method of the present invention has excellent energy concentration performance, wherein the degree of energy concentration approaches the 8×8 Discrete Cosine Transform (DCT), thus greatly eliminating the correlation of video data in transform space. The transform method also has low calculation complexity, which can be realized by addition and shift and is easy to implement by hardware; and the transform method has high calculation precision, and thus there does not exist the problem that the forward transform does not match the inverse transform.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a video coding 8x8 integer transformation method. Background technique [0002] A complete video coding system is composed of a series of algorithm modules such as prediction, transformation, quantization, and entropy coding. Among them, intra-frame and inter-frame prediction is to use the correlation of video data in space and time to compress data. The transformation module is to transform the image residual data output by the prediction module from the time domain to another space, so that the energy of the flatly distributed data in the time domain is concentrated in the transformed space, and most of the energy of the data is concentrated in the low frequency area of ​​the space . In the subsequent quantization and entropy coding modules, the transformed data distribution characteristics will be effectively used to further compress the data. Obviously, the tr...

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Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to propose a video encoding 8x8 integer transformation method, aiming to solve the problem that the DCT transformation matrix in the prior art uses floating-point multiplication and addition, which takes up a lot of hardware resources, and the calculation is complex and large, and the calculation accuracy is not high. The inverse transformation cannot be completely matched, and the transformation is irreversible

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