Video coding 4*4 integer transform method

Abstract

The invention discloses a video coding 4*4 integer transform method in which 4*4 image residual error data X is output by a forecast module in a coder is received to select one of different integer transform bases [1,9,4], [1,7,3] and [1,8,3] to construct a transform matrix P; a scaling matrix PE=ZT*Z is constructed according to the transform matrix P; the image residual error data X is forwards transformed according to Y=PXPT, and corresponding integer transform computation methods are adopted according to the different integer transform bases; and data Y after 4*4 forward transform is scaled. The transform method disclosed by the invention has excellent energy concentration performance, the energy concentration ratio approaches to 4*4DCT (Discrete Cosine Transform), and the relativity of video data in transform space can be largely eliminated; the computing complexity is low, computation can be realized through addition and displacement, which is easy for hardware realization, the operational precision is high, and the problem that forward transform and reverse transform are unmatched does not exist.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a video coding 4x4 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 4x4 integer transformation method for video coding, aiming at solving 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, the calculation is complex and the calculation accuracy is not high, and the DCT is positive. The inverse transformation cannot be completely matched, and the transformation is irreversible

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