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Reversible Watermarking Algorithm Based on pvo and Adaptive Block Segmentation

A block segmentation and self-adaptive technology, applied in computing, instrumentation, image data processing, etc., can solve problems such as unsuitable medical images

Active Publication Date: 2019-03-19
GUANGDONG UNIV OF TECH
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Problems solved by technology

Therefore, traditional digital watermarking techniques are not suitable for medical images

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  • Reversible Watermarking Algorithm Based on pvo and Adaptive Block Segmentation
  • Reversible Watermarking Algorithm Based on pvo and Adaptive Block Segmentation
  • Reversible Watermarking Algorithm Based on pvo and Adaptive Block Segmentation

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Embodiment Construction

[0062] A reversible watermarking algorithm based on PVO and adaptive block segmentation, including watermark embedding process, watermark extraction and original image restoration process, wherein the watermark extraction and original image restoration process is the inverse process of watermark embedding process, characterized in that watermark embedding The process consists of the following steps:

[0063] ① Divide the pixels of a cover image into non-overlapping image blocks, each image block contains n pixels, and (n+1) adjacent pixels of the image block form a pixel set, and calculate the variance of the set; set The threshold of the variance, compare the variance of the pixel set with the threshold, if the variance is less than a certain threshold, the image block is considered to belong to the smooth area, otherwise the image block is considered to be in the texture area;

[0064] The specific content is as follows: In the process of watermark embedding, an original ima...

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Abstract

The invention discloses a reversible watermarking algorithm based on PVO (Pixel Value Ordering) and self-adaptive block segmentation and belongs to the field of multimedia information security. According to the algorithm, an image block is roughly segmented into two categories according to the complexity of local texture characteristics: a smooth block and a texture block; the smooth block is then subdivided into two sub-categories according to the correlation degree of a pixel in blocks: blocks with low smoothness and blocks with high smoothness. The blocks with low smoothness are ordered according to the sequence of pixel values from low to high to obtain psigma (1), psigma(2),to psigma (n); psigma(n-1) and psigma (n) are predicted by using psigma (n-2) or psigma(2) and psigma (1) are predicted by using psigma (3); one block with low smoothness can carry watermarking information of four bits at most. The blocks with high smoothness are segmented into sub-blocks which only contain three pixels respectively, that is (p1, p2 and p3), p1, p2 and p3 are ordered to obtain psigma (1), psigma (2) and psigma (3). According to the reversible watermarking algorithm based on PVO and self-adaptive block segmentation, the purpose of modifying psigma (1) and psigma (2) is achieved by only modifying psigma (3), the embedding distortion is greatly reduced.

Description

technical field [0001] The invention relates to the field of multimedia signal processing, in particular to a reversible watermark algorithm in digital watermark technology. Background technique [0002] Traditional digital watermarking technology will cause permanent distortion of the host image. However, in some practical applications, a little bit of permanent modification of the host image is not allowed, such as medical, military and judicial fields. Taking medical images as an example, distortion of any kind is not allowed. The acquisition of any medical image requires the support of sophisticated instruments and expensive medical expenses. More importantly, distortion may cause potential misdiagnosis. For example, for an ECG (electrocardiographic) signal diagram, any abnormality in the signal curve may be interpreted as a certain pathological feature. Therefore, traditional digital watermarking techniques are not suitable for medical images. A technique called rev...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
CPCG06T1/0071
Inventor 翁韶伟张天聪潘正祥
Owner GUANGDONG UNIV OF TECH
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