Method and apparatus for realizing self-adaptive quantization in coding process

An adaptive quantization and coding technology, applied in the field of coding, can solve the problem of not being able to achieve the subjective quality of the image, and achieve the effect of improving the subjective quality

Inactive Publication Date: 2007-09-19
HUAWEI TECH CO LTD +1
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Problems solved by technology

[0011]However, since the image content in a sequence is not exactly the same, but also has a large change, that is, the details of the image in the same image sequence Therefore, if the same quantization matrix is ​​used for the entire sequence to achieve quantization processing, it is obviously impossible to achieve the best subjective quality of the quantized encoded image

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  • Method and apparatus for realizing self-adaptive quantization in coding process
  • Method and apparatus for realizing self-adaptive quantization in coding process

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Embodiment Construction

[0024] The quantization mode applied in the embodiment of the present invention includes but is not limited to quantization matrix, quantization parameter and quantization step size, etc., and the codec operation on the image can be realized through the determined quantization mode.

[0025] In the embodiment of the present invention, the corresponding quantization mode is determined according to the image information, so that each region in the image can obtain the best quantization mode within a certain range; wherein, the image information includes but not limited to image content information, image encoding information. Therefore, by using the quantization mode provided by the embodiment of the present invention to perform quantization calculation on the image area, the subjective quality of the encoded image can be greatly improved under the same code rate condition.

[0026] The method for implementing adaptive quantization provided by the embodiment of the present inven...

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Abstract

Disclosed is a method and device for realizing self-adaption quantization in encoding process. The mainly adopted implemental schemes comprise: firstly, based on the content of the encoding image, selecting a coincidental quantizing mode; secondly, in the decision-making process of the quantizing mode, adopting the encoding type, the motion vector, etc. of two adjacent blocks as the decision-making gist for the quantizing mode selection of the current block; finally, decision-making of quantizing mode also considering about the different sensitivity of human visual capability to different image content. Thereby, the present invention can make full use of human visual capability and can realize the great improvement on subjective quality of the encoding images in same encoding rate.

Description

technical field [0001] The present invention relates to the field of coding technology, in particular to a technology for quantization mode decision-making in the coding process of images and the like. Background technique [0002] In the image coding and decoding technology, the coding for the image usually needs to divide the image into coding blocks and then perform coding processing. For the image divided into coding blocks, the corresponding block transformation coefficients will be obtained through orthogonal transformation processing, and the block transformation coefficients will be quantized and rounded to calculate, and entropy coding can finally obtain the code stream corresponding to the compressed code of the image , so as to realize the encoding operation for the image. [0003] In the framework of video compression coding, for intra-frame coding, the quantized data is the transformation coefficient value of the image block, and for inter-frame coding, the qua...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/30H04N7/40H04N19/124
Inventor 郑建铧何芸陈建文
Owner HUAWEI TECH CO LTD
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