High capacity reversible water mark method based on predication and companding technology

A high-capacity, watermarking technology, applied in image data processing, instruments, image data processing, etc., to achieve the effect of increasing embedding capacity, low computational complexity, and low embedding distortion

Inactive Publication Date: 2008-01-16
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In the case of low threshold, this method also has the same disadvantages as Tian's method

Method used

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  • High capacity reversible water mark method based on predication and companding technology
  • High capacity reversible water mark method based on predication and companding technology
  • High capacity reversible water mark method based on predication and companding technology

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] For an original image I of r×c, all pixels are arranged into a one-dimensional sequence s in raster order 1 ,s 2 ,...,s r×c , where s i Indicates the pixel value at position i, 1≤i≤r×c.

[0025] As shown in Figure 2, the embedding process of the present invention includes the following parts:

[0026] 1. Forecast operation:

[0027] s i ~ = s i + 1 - - - ( 1 )

[0028] where s i Indicates the current pixel value, represents its predicted value. For each sorted pixel, the prediction operation essentially uses its right-neighboring pixels to predict itself.

[0029] Since forecasts are biased...

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Abstract

The invention discloses a high-capacity reversible watermark method based on predication and companding technique. Through the introduction of the companding technique, the invention includes two processes: watermark embedding and watermark extracting. The invention effectively solves the problem of capacity consumption of position drawing in reversible watermark algorithm, and achieves high embedding capacity even in the situation of low threshold value. Meanwhile, due to the operation of data re-embedding after the compression of high predication errors, the invention still can maintain high peak signal to noise ratio (PSNR value).

Description

technical field [0001] The invention relates to a high-capacity reversible watermarking method based on prediction and companding technology, especially the high-capacity reversible watermark, belonging to the technical field of digital watermarking. Background technique [0002] Digital watermarking technology refers to a technology that embeds some logos or signatures in digital multimedia without being noticed. It plays a vital role in some applications, such as digital media copyright protection, authentication, data integrity, digital fingerprinting, and data hiding. However, digital watermarking usually introduces some subtle, irreversible or some permanent distortions to the carrier image. Although these distortions are very slight, in some fields that require high precision, such as law, medicine and military systems, when After the hidden data has been extracted, the original image needs to be restored without distortion, so even very slight distortions are not all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 赵耀翁韶伟潘正祥倪蓉蓉
Owner BEIJING JIAOTONG UNIV
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