A High Capacity Reversible Watermarking Method Based on Remainder Invariance

A high-capacity, watermarking technology, applied in image data processing, image data processing, instruments, etc., can solve problems such as image visual quality degradation, and achieve the effect of reducing embedded distortion

Inactive Publication Date: 2017-07-07
GUANGDONG UNIV OF TECH
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Problems solved by technology

Therefore, due to the introduction of this additional item, Alatter introduces an additional embedding distortion of up to 2 per pixel, which will directly lead to a serious decrease in the visual quality of the image

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  • A High Capacity Reversible Watermarking Method Based on Remainder Invariance
  • A High Capacity Reversible Watermarking Method Based on Remainder Invariance
  • A High Capacity Reversible Watermarking Method Based on Remainder Invariance

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[0027] The technical solutions of the present invention will be described in detail below with reference to the drawings and specific embodiments, so as to understand the essence of the present invention more clearly and intuitively.

[0028] The high-capacity reversible watermarking method based on remainder invariance of the present invention includes watermark embedding process, watermark extraction and original image restoration process.

[0029] In the watermark embedding process of this embodiment, the size of a pair is Original image Divide into non-overlapping Size sub-blocks, there are Image sub-blocks: . use Means a certain Image sub-blocks of size, namely . Integer transformation can be regarded as a prediction process. First, the average value of the image sub-block is used to predict each pixel in the sub-block to obtain Prediction errors, namely . For the former For each of the three prediction errors Second difference expansion, namely , And embedded ...

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Abstract

The invention discloses a high-capacity reversible watermarking method based on remainder invariance; it includes watermark embedding process, watermark extraction and original image restoration process; the integer transformation proposed by the invention removes additional items and reduces embedding distortion. It consists of a prediction process that uses the mean value of the block to predict each pixel in the block, and only allows each prediction error before the last prediction error in the sub-block to carry watermark information, while letting the last pixel only be predicted but not carry Any watermark information to ensure the reversibility of the integer transformation; using the characteristic that the remainder obtained by dividing the mean value of the image sub-block by a given embedding parameter does not undergo transformation before and after embedding, the integer transformation can restore the original pixels without distortion and watermark information; therefore, the present invention has a considerable improvement both in embedding capacity and in recovering image quality.

Description

Technical field [0001] The present invention relates to the technical field of multimedia signal processing, in particular to a high-capacity reversible watermarking method based on the invariance of remainder. Background technique [0002] Traditional digital watermarking technology will cause permanent distortion of the host image. However, in some practical applications, no permanent modification of the host image is allowed, such as medical, military, and judicial fields. Taking medical images as an example, any form of distortion 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 graph, any abnormality in the signal curve may be interpreted as a certain pathological feature. Therefore, traditional digital watermarking technology is not suitable for medical images. A technol...

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Application Information

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