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Reversible data hiding method combining adaptive quad-tree coding

A technology of adaptive coding and information hiding, applied in the field of reversible information hiding combined with quadtree adaptive coding, to achieve the effect of improving embedding capacity and performance.

Inactive Publication Date: 2017-10-10
ENG UNIV OF THE CHINESE PEOPLES ARMED POLICE FORCE
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  • Abstract
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Problems solved by technology

There is no adaptive algorithm for content-adaptive segmentation of such special images and fusion of image compression, adaptive coding, reversible data hiding and other technologies

Method used

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  • Reversible data hiding method combining adaptive quad-tree coding
  • Reversible data hiding method combining adaptive quad-tree coding

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Embodiment Construction

[0026] The invention discloses a reversible information hiding method combined with quadtree adaptive coding, which includes two processes of information embedding at the encoding end and information extraction at the decoding end. The specific process of embedding information at the encoding end is as follows:

[0027] S1. Taking the original image as the initial image block, judging the current image block according to the pixel conditions of the image block, and determining the category of the image block;

[0028] Determine image block type:

[0029] The image block types include four types: extremely smooth block (type I), general smooth block (type II), general embeddable block (type III) and non-embeddable block (type IV), among which type I, type II, type III Classes are collectively called embeddable blocks.

[0030] When the pixel values ​​of the image blocks are exactly the same, it is determined that the image block category is Class I (extremely smooth block);

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Abstract

The invention discloses a reversible data hiding method combining adaptive quad-tree coding. The method mainly comprises two steps including encoding-end information embedding and decoding-end information extracting. An image content adaptive strategy is employed so that the embedding capacity of reversible data hiding is improved compared to that of a non-adaptive method, and the image performance is more obviously improved especially for special images with enormous smooth areas and complex texture areas and obviously distribution of the two kinds of areas, such as medical images.

Description

technical field [0001] The invention belongs to the technical field of image coding and information hiding, and in particular relates to a reversible information hiding method combined with quadtree adaptive coding. Background technique [0002] Reversible information hiding refers to a technology that can embed additional information in the host information, and the legal recipient can correctly extract the additional information and restore the original host information without distortion. It is widely used in the field of security. Current image reversible data hiding techniques mainly include lossless compression, histogram translation, and integer transformation. The technical indicators are mainly embedding capacity (unit bpp, that is, the number of bits embedded per pixel) and peak signal-to-noise ratio after embedding (referred to as PSNR, unit dB, which measures the degree of distortion of the image after embedding). Improving embedding capacity is one of the main...

Claims

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Application Information

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IPC IPC(8): H04N19/10H04N19/122H04N19/17H04N19/467H04N19/96
CPCH04N19/10H04N19/122H04N19/17H04N19/467H04N19/96
Inventor 狄富强段俊逸张敏情张英男刘佳
Owner ENG UNIV OF THE CHINESE PEOPLES ARMED POLICE FORCE
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