Method for embedding and extracting reversible watermark of digital image

A digital image and watermark embedding technology, applied in image data processing, image data processing, instruments, etc., can solve the problems of high embedding capacity, unfavorable practical application of reversible watermark algorithm, large distortion, etc., to ensure image quality and improve watermark embedding Effects of capacity and reduction in running time

Inactive Publication Date: 2013-01-30
LANZHOU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, most of these algorithms have the characteristics of high embedding capacity and large...

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  • Method for embedding and extracting reversible watermark of digital image
  • Method for embedding and extracting reversible watermark of digital image
  • Method for embedding and extracting reversible watermark of digital image

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Embodiment Construction

[0029] The present invention is a digital image reversible watermark embedding method and its extraction method, wherein, the digital image reversible watermark embedding method comprises the following steps:

[0030] (1) Divide the carrier image X into N non-overlapping small blocks , x i is any one of x;

[0031] (2) Divide the obtained small blocks into a set of three types of blocks: smooth block set I 1 , common block set I 2 and the set of complex blocks I 3 ;

[0032] (3) Use raster scanning to scan the embedding area from right to left and from bottom to top, I 1 , I 2 For block CS random projection, I 3 No change, correspondingly get the random projection measurement value I after compressed sensing 1 ' , I 2 ' set; use the adaptive integer transform method to determine the capacity parameter k of the corresponding block x ;

[0033] (4) Establish a bit sequence record Location Map (LM) according to step (3), wherein:

[0034]

[0035] At the sam...

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Abstract

The invention discloses a method for embedding and extracting a reversible watermark of a digital image. The method comprises the following steps of: blocking a carrier image, judging the block types by utilizing a statistical relation between a surrounding block and a target block, adaptively selecting capacity parameters, performing block compression sensing, embedding a watermark by utilizing integer transform, embedding the watermark into a smooth and common carrier image block subjected to compression sensing for improving the watermark embedding capacity, wherein the complex carrier image block is not processed, so that the image quality and the imperceptibility are ensured; and finally, restoring the carrier image by adopting a block compression reconstructing algorithm and the reversible integer transform.

Description

technical field [0001] The invention belongs to the field of multimedia information security, and specifically relates to a method for embedding and extracting a digital image reversible watermark algorithm based on block adaptive compressed sensing, which can be used in medical diagnosis, military image and remote sensing image processing, etc., which require high data accuracy. Digital image copyright protection in application field. Background technique [0002] In real life, if tampered and forged digital images are used in formal media, medical diagnosis, electronic bills and court evidence, etc., it will have a negative impact on social stability, medical care, electronic transactions and many other aspects. Therefore, in the application of digital image, especially in the application that the integrity, authenticity and credibility of digital image are very critical to image application, it is very important to provide a tool for verifying the integrity and authentici...

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Application Information

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IPC IPC(8): G06T1/00
Inventor 张秋余孙媛晏燕刘洪国尚其昌左航洲
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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