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Method and device for adaptively adjusting coefficients of image blocks

An adaptive adjustment and image block technology, applied in the field of multimedia image coding and decoding, can solve the problems of high algorithm complexity, not being well utilized, and not being able to combine human visual information well, so as to improve coding efficiency, The effect of maintaining subjective quality and reducing bit rate

Inactive Publication Date: 2013-09-11
PEKING UNIV
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Problems solved by technology

However, this feature has not been well exploited in the encoding process to improve the efficiency of quantization
Existing adjustment methods for quantization coefficients, such as rate-distortion quantization (RDOQ), cannot well combine human visual information, and the algorithm complexity is high, so it is not easy to use in image coding

Method used

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  • Method and device for adaptively adjusting coefficients of image blocks
  • Method and device for adaptively adjusting coefficients of image blocks
  • Method and device for adaptively adjusting coefficients of image blocks

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Embodiment Construction

[0034] A more complete and better understanding of the invention, and many of its attendant advantages, will be readily apparent from the following detailed description when considered in conjunction with the accompanying drawings, but the accompanying drawings illustrated herein are intended to provide a further understanding of the invention and form part of this disclosure. As a part of the invention, the exemplary embodiments of the invention and their descriptions are used to explain the invention, and do not constitute an improper limitation of the invention.

[0035] In order to make the above purposes, features and advantages more obvious and understandable, the following combined Figure 1-3 The present invention will be further described in detail with specific embodiments.

[0036] Such as figure 1 Shown, a kind of intra prediction method, comprises the following steps:

[0037] S21. To determine whether the current coefficient block needs to be processed;

[003...

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Abstract

The invention discloses a method and a device for coding images. The method includes dividing an image into code blocks and processing the code blocks; selecting processing techniques for the code blocks according to characteristics of coding coefficients of the image; scanning coding coefficients in reversed order; adaptively contracting brightness and chromaticity coefficients according to the selected processing techniques. The method and the device have the advantages that a reasonable process for contracting the coefficients is designed, so that values of high-frequency coefficients can be reduced without affecting the subjective visual quality, the coding rate is reduced, and the coding efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of multimedia image encoding and decoding, in particular to an image block coefficient adaptive adjustment method and device. Background technique [0002] In image and video coding, the quantization process can reduce the length of image coding without reducing the visual effect, and reduce unnecessary information in visual restoration. It can map encoding coefficients to smaller values. In existing image or video coding techniques, scalar quantization is widely used. After the transformation coefficients are quantized, they have large values ​​in the low-frequency coefficients and DC region, while there are a small number of small values ​​in the high-frequency region. Usually, compression is performed according to this statistical characteristic to achieve high compression efficiency. [0003] Because the perception of the human visual system is not exactly the same for high-frequency coefficients and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
Inventor 马思伟王诗淇张新峰
Owner PEKING UNIV
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