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Method for locally adjusting a quantization step

一种局部调整、量化阶的技术，应用在脉冲调制电视信号传输、电视、电气元件等方向，能够解决重构质量变化等问题

Inactive Publication Date: 2008-04-02
INTERDIGITAL VC HLDG INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by using these methods, the reconstruction quality (i.e. the quality after decoding) of important macroblocks can vary drastically from one picture to the next, which is a problem for the observer
In addition, the quality of the reconstruction varies within the region of interest

Method used

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Examples

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Embodiment Construction

[0024] The present invention relates to a method for quantization step (QP * ) to locally adjust the quantization order of each region of interest (i.e., the region that attracts more attention) of the image. An image that is part of a sequence of multiple images is made up of blocks of pixels. In methods that make local changes to the quantization order, the visual quality of the regions involved for a given overall bitrate is improved by favoring regions of spatial interest at the expense of other regions in the image. Based on the selection of regions of interest in the image, the quantization scale is locally adjusted according to the interest in these regions. This adjustment is performed in such a way as to increase the compression of less important regions and, along the sequence, to reallocate possibly unused coding resources (ie, number of bits) to regions of interest. This reallocation of bits from one image to another makes it possible to obtain a more stable reco...

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Abstract

The invention relates to a method of locally adjusting a quantization step for each region of an image in a sequence of n images. The method comprises the following steps; calculating, for each image of the sequence, a first difference of bits saved on the potential masking region when quantizing it with a first quantization step and a second difference of bits required by the region of interest when quantizing it with a second quantization step; and in each image of the sequence, assigning to the potential masking region the first quantization step and if the sum of the n first differences of bits is higher than the sum of the n second differences of bits assigning said second quantization step to said region of interest and otherwise assigning a third quantization step such that the sum of said n first differences of bits is distributed between the regions of interest according to a reconstruction quality criterion.

Description

technical field [0001] The invention relates to a method of locally adjusting the quantization order in a sequence of images using a step of pre-analyzing the sequence of images. Background technique [0002] The invention is applied in the field of video compression, specifically selective compression. Any method for selective compression of images with regions of interest involves two mechanisms: a priori selection and a priori compression: [0003] - The selection of information is a visual attention mechanism that defines the location of events of interest contained in the image and the relative importance of these events relative to each other; [0004] - A priori the compression mechanism characterizes the properties of the image and the encoding and allocation criteria for encoding resources (ie bit rate or quality). [0005] Any compression method includes a quantization method for quantizing the data to be encoded. More specifically, the invention relates to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/30
CPCH04N7/26079H04N7/26319H04N7/26196H04N19/00775H04N7/26276H04N19/0009H04N19/0029H04N7/30H04N19/002H04N19/00357H04N19/00193H04N7/26281H04N19/0026H04N7/26186H04N19/124H04N19/152H04N19/154H04N19/17H04N19/179H04N19/192H04N19/60H04N19/132H04N19/167
Inventor 莱拉·于格内尔多米尼克·索罗菲利浦·吉约泰尔
Owner INTERDIGITAL VC HLDG INC
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