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Video image coding method

A technology of video image and coding method, which is applied in the field of video image coding, and can solve the problems of large difference in transformation results, reduction of transformation performance and compression efficiency, etc.

Active Publication Date: 2008-12-03
TENCENT TECH (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The 2D 4×4 DCT-like integer transformation method given in literature [1], although its transformation performance is relatively close to DCT transformation, its transformation results are quite different from DCT, which will reduce the transformation performance and compression efficiency

Method used

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Examples

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example 1

[0229] Example 1: A 4×4 image is X 1 = 5 11 8 10 9 8 4 12 1 10 11 4 19 6 15 7 , but:

[0230] The result of its DCT transformation is Y 10 = 35.0000 - ...

example 2

[0235] Example 2: A 4×4 image is X 2 = 164 149 88 87 147 94 90 102 95 92 116 119 111 112 140 150 , but:

[0236] The result of its DCT transformation is Y 20 = 464.0000 ...

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Abstract

A video encoding method is disclosed. The method comprises the steps of firstly performing macroblock prediction and compensation of the image; then performing 4 x 4 DCT like integer transformation of the predicted difference values; and then performing quantification and entropy encoding of the transformation coefficients. The method adopts a new 4 x 4 DCT-like integer transformation method and the corresponding inverse transformation, quantification, inverse quantification methods. The computation complexity of the transformation method is lower since the transformation process only relates to addition and multiplication. The transformation results of the invention greatly approximate to the 4 x 4 DCT transformation, and the decorrelation performance is as good as DCT transformation, therefore a better video compression effect is achieved.

Description

technical field [0001] The invention relates to the field of video processing, in particular to a video image coding method. technical background [0002] At present, the technology in the video field is advancing by leaps and bounds, and there are many technical solutions for video coding. However, because the cosine transform has good decorrelation performance and is easy to implement quickly, it has been widely used in the field of video coding. The existing video Compression standards MPEG-1, MPEG-2, MPEG-4 (Part 2), H.261, and H.263 are all based on 8×8 DCT transformation, and their general processing framework is as follows: figure 1 shown. [0003] H.263 encoding compression framework such as figure 2 As shown, "T" refers to the 8×8 DCT transformation of image data or prediction difference data. [0004] The general representation of the cosine transform is: [0005] F ( u ) = ...

Claims

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Application Information

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IPC IPC(8): H04N7/30
CPCH04N19/00775H04N7/30H04N19/60
Inventor 熊联欢
Owner TENCENT TECH (SHENZHEN) CO LTD
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