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Method for improving digital signal conversion performance and digital signal conversion method and device

A digital signal and performance technology, applied in the fields of digital video signal modification, image communication, electrical components, etc., can solve the problems of insufficient nuclear de-correlation, unsatisfactory transformation performance, and not good enough.

Active Publication Date: 2014-12-24
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] It can be seen that whether it is H.265 or the AVS2 standard that is still being formulated, there is still room for improvement in the design of its transformation process (including the transformation kernel matrix and transformation process). Therefore, in video image coding, the existing The de-correlation of the digital signal transformation kernel is not strong enough, the degree of orthogonality and normalization is not good enough, resulting in excessive transformation distortion and unsatisfactory transformation performance

Method used

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  • Method for improving digital signal conversion performance and digital signal conversion method and device
  • Method for improving digital signal conversion performance and digital signal conversion method and device
  • Method for improving digital signal conversion performance and digital signal conversion method and device

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Effect test

Embodiment 1

[0096] In an actual 8×8 transformation process, the realization of the transformation has the following requirements: each coefficient in the transformation kernel matrix A is an integer, and the storage space of each coefficient does not exceed 9 bits, namely

[0097] If α=3, β=γ=1, the transformation kernel matrix A must satisfy at the same time:

[0098] (a) [DCT(i,j)×Factor]-2≤A(i,j)≤[DCT(i,j)×Factor]+2

[0099](b) J(A)

[0100] The TH value is obtained according to the following:

[0101] The matrix M is in The matrix obtained by rounding and rounding according to formula (1) is as follows:

[0102] M = 128 128 128 128 128 128 128 128 ...

Embodiment 2

[0108] In an actual 16×16 transformation process, the realization of the transformation has the following requirements: each coefficient in the transformation kernel matrix A is an integer, and the storage space of each coefficient does not exceed 8 bits, ie Factor=256.

[0109] If α=2, β=γ=1, the transformation kernel matrix A must satisfy at the same time:

[0110] (a) [DCT(i,j)×Factor]-2≤A(i,j)≤[DCT(i,j)×Factor]+2

[0111] (b) J(A)

[0112] The TH value is obtained according to the following:

[0113] The matrix M is the 16×16 transformation kernel specified in the H.265 standard, as follows:

[0114] M = 64 64 64 64 64 64 64 64 ...

Embodiment 3

[0120] In an actual 8×8 transformation process, the realization of the transformation has the following requirements: each coefficient in the transformation kernel matrix A is an integer, and the storage space of each coefficient does not exceed 8 bits, namely

[0121] If α=2, β=γ=1, the transformation kernel matrix A must satisfy at the same time:

[0122] (a) [DCT(i,j)×Factor]-2≤A(i,j)≤[DCT(i,j)×Factor]+2

[0123] (b) J(A)

[0124] The TH value is obtained according to the following:

[0125] The matrix M is the 8×8 transformation kernel matrix specified in the H.265 standard, as follows:

[0126] M = 64 64 64 64 64 64 64 64 ...

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Abstract

The invention discloses a method for improving digital signal conversion performance and a digital signal conversion method and device. The method for improving the digital signal conversion performance includes the steps of constructing a conversion kernel matrix A with N rows and N columns, and enabling the conversion kernel matrix A to meet the condition (a) and the condition (b) at the same time: (a)[DCT(i,j)*Factor]-2<=A(i,j)<= [DCT(i,j)*Factor]+2(b)J(A)<TH, wherein (img file='DDA00003345538500011.TIF' wi='1080'he='152' / )( / maths). According to the method for improving the digital signal conversion performance and the digital signal conversion method and device, it can be guaranteed that digital signal processing has higher conversion performance.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a method and device for improving digital signal conversion performance, and a digital signal conversion method and device. Background technique [0002] As a digital signal processing method, video and image coding technology is the basis and key to the wide application of digital video and image, an important multimedia information. Under the current block-based video coding hybrid framework, video coding generally includes the following four blocks: predictive coding, transformation and quantization, entropy coding, and loop filtering. The main function of the transformation is to remove the correlation between the prediction residuals and concentrate the energy of the residuals, which is beneficial to the subsequent entropy coding and improves the efficiency of video coding as a whole. [0003] In JPEG, MPEG-1 / 2 / 4, H.261 and other video image coding standar...

Claims

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Application Information

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IPC IPC(8): H04N19/625
CPCH04N19/176H04N19/122H04N19/96H04N19/154H04N19/625H04N19/70
Inventor 朱兴国虞露陈杰
Owner ZHEJIANG UNIV
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