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Method of converting transformation coefficient block for video conversion

A technology of conversion coefficients and conversion methods, which is applied in digital video signal modification, television, electrical components, etc., can solve the problems of high operation complexity and low operation complexity, and achieve the effect of reducing calculation complexity

Inactive Publication Date: 2009-04-08
深圳市迪威迅股份有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that the coefficient block conversion operation complexity is too high, thereby providing a conversion method for transform coefficient blocks used in video conversion with low operation complexity

Method used

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  • Method of converting transformation coefficient block for video conversion
  • Method of converting transformation coefficient block for video conversion
  • Method of converting transformation coefficient block for video conversion

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0020] The specific conversion process of converting an 8×8 DCT coefficient block into four 4×4 integer transform coefficient blocks is as follows: figure 1 As shown, the specific steps are:

[0021] 1) Combining the scaling matrix D into the MPEG-2 inverse quantization matrix, that is, multiplying the diagonal matrix D and the MPEG-2 inverse quantization matrix to obtain a result matrix to replace the original MPEG-2 inverse quantization matrix. That is, the MPEG-2 inverse quantization process uses the result matrix as a new inverse quantization matrix; where:

[0022] D = a 0 0 0 0 0 ...

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Abstract

The invention relates to a method for converting 8*8 discrete cosine transform factor into four 4*4 integral transform factors, wherein it comprises that: 1, combining zoom matrix into MPEG-2 reverse quantified matrix; 2, via transform matrix, adjusting the position of 8*8DCT blocks in the step 1; 3, converting adjusted 8*8DCT blocks into four 4*4 integral transform factors. The invention can improve video quality and reduce the calculation complexity.

Description

technical field [0001] The present invention relates to a conversion method for transform coefficient blocks used in video conversion, in particular to a conversion method for directly converting an 8*8 discrete cosine transform (DCT) coefficient block into four 4*4 integer transform coefficient blocks. Background technique [0002] H.264 is the latest international video standard jointly researched and formulated by ISO / IEC and ITU. Since the H.264 standard greatly improves video compression efficiency, it will be widely used in video communication, high-definition TV, DVD and digital video camera (DVR), compressed video storage, video database, and future mobile video communication. MPEG-2 is currently the most widely used video coding standard. In order to protect media service providers' investment in MPEG-2 software and hardware and to utilize video resources that have been compressed using the MPEG-2 standard, a transcoder is required to convert MPEG-2 to H.264 video ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/50H04N19/124H04N19/625H04N19/645
Inventor 陈杲林守勋张勇东
Owner 深圳市迪威迅股份有限公司
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