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Integer translation base optimization method in video coding standard

An integer transformation and video coding technology, which is applied in the field of video coding to achieve the effect of improving communication quality, comprehensive efficiency and high efficiency.

Inactive Publication Date: 2010-02-24
WUHAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the deficiencies of the existing integer transformation base acquisition method, and propose a regular integer transformation base optimization method

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  • Integer translation base optimization method in video coding standard
  • Integer translation base optimization method in video coding standard
  • Integer translation base optimization method in video coding standard

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Embodiment Construction

[0017] The preferred method of integer transformation base provided by the invention comprises the following steps:

[0018] Step 1, according to the DCT transformation coefficient matrix C, solve the expression corresponding to the integer transformation matrix I, where the coefficient of C is marked as c k , the coefficient of I is denoted as i k , k=0~N; the DCT transformation coefficient matrix C generally includes M×M elements, M=4, 8, 16...; N represents the number of coefficients with different values ​​in the coefficient matrix, and the value depends on the specific situation;

[0019] Step 2, put i k Normalized to obtain the calibration coefficient j k , k=0~N;

[0020] Step 3, use the search method to search for the solution i k To form a transformation base, follow the following four constraints when searching,

[0021] (a)II T The elements other than the diagonal in the matrix all satisfy the value of 0, and the II T The matrix is ​​obtained by multiplying t...

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Abstract

The invention relates to the video coding field, in particular to an integer transform basis optimizing method in video coding standards, which is characterized in that the optimizing method comprisesthe following steps: firstly, an expression of a corresponding integer transformation matrix I is solved according to a DCT transformation coefficient matrix C, wherein, a coefficient marker of the Cis ck and a coefficient mark of the I is ik, and K is equal to 0 to N; secondly, a calibration coefficient jk is solved after normalization of ik, and k is equal to 0 to N; thirdly, search finding ofthe ik is performed by adoption of a search method, and transform basis is composed, wherein, following four constraint conditions must be followed during the search process: elements except for diagonals in a IIT matrix all meet the condition that the value is 0; step size in search is limited to be one half during the process of search founding of the ik; the calibration coefficient jk must meet threshold requirements, and threshold values are subject to transform basis number which is expected to be obtained through search; maximum amplitude of the coefficient ik in the integer transformation matrix I is 15; fourthly, the transform basis obtained through search is scaled to be an integer, and integer transform basis corresponding to the matrix C is obtained. High quality integer transform basis can be comprehensively and quickly obtained by adoption of the invention.

Description

technical field [0001] The invention belongs to the field of video coding, in particular to an integer transformation base optimization method in video coding standards. Background technique [0002] The new-generation video coding standard H.264 is developed by the Joint Video Team (JVT) of the International Telecommunication Union (ITU) and the International Standards Organization (ISO), and is the latest development standard for practical applications. Its goal is to improve image quality based on high video resolution, and to be able to cover all low-bandwidth and high-bandwidth applications. H.264 is a single new-generation video coding standard that can be used by both ITU-T and ISO / IEC based on the ITU-T enhanced multimedia communication standard H.26L, and forms a system with the MPEG standard technically. [0003] Similar to the previous standard, H.264 uses block-based transform coding for the residual data. Transform coding can remove the spatial redundancy of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/126H04N19/46H04N19/60H04N19/625H04N19/70
Inventor 胡瑞敏王中元高尚韩镇
Owner WUHAN UNIV
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