High-volume reversible watermarking method based on remainder invariance

A high-capacity, remainder 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: 2013-12-11
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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  • High-volume reversible watermarking method based on remainder invariance
  • High-volume reversible watermarking method based on remainder invariance

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Embodiment Construction

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

[0028] The high-capacity reversible watermark 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, a pair of size is original image of non-overlapping A subblock of size, then there is image subblocks: . use means a certain An image subblock of size, that is, . Integer transformation can be regarded as a prediction process, first use the mean value of the image sub-block to predict each pixel in the sub-block, and get prediction error, that is . for ex For each of the forecast errors Sub-difference expansion, namely , and embedded ...

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Abstract

The invention discloses a high-volume reversible watermarking method based on remainder invariance. The method comprises a watermark embedding process and a watermark extraction and original image recovery process. A integer transformation provided by the invention removes additive terms and reduces embedding distortion; the integer transformation is composed of only a prediction process, and involves predicting each pixel in a block by using the mean value of the block, enabling each prediction error before a final prediction error in a sub-block to carry watermarking information and enabling a final pixel to be only predicted but carry no watermarking information so as to ensure the reversibility of the integer transformation; and by using the characteristic that the remainder obtained through the mean value of an image sub-block being divided by a given embedding parameter remains untransformed beforehand and afterwards, the integer transformation can help to recover original pixels and watermarking information without distortion. Therefore, by the provided method, improvements to a great extent are made in terms of both embedding capacity and recovery image quality.

Description

technical field [0001] The invention relates to the technical field of multimedia signal processing, in particular to a high-capacity reversible watermarking method based on remainder invariance. 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 precision 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 techniques are not suitable for medical images. A tech...

Claims

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Application Information

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Patent Type & Authority Applications(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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