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Digital waterprint imbedding and extracting method based on remainder image

A technology of digital watermarking and extraction method, which is applied in the field of low bit error rate data hiding, can solve problems such as high bit error rate, etc., and achieves the effects of high security, convenient distribution and management, and reduced bit error rate.

Inactive Publication Date: 2004-01-28
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, the Hartung algorithm is based on the statistical distribution of the carrier image. Compared with the watermark data, the carrier image / video data is regarded as "noise"; therefore, even when the carrier image is not attacked, the extracted watermark will exist because of these "noises" high bit error rate

Method used

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  • Digital waterprint imbedding and extracting method based on remainder image
  • Digital waterprint imbedding and extracting method based on remainder image
  • Digital waterprint imbedding and extracting method based on remainder image

Examples

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Embodiment

[0028] Let the original image be the standard "Lena", such as image 3 (a), the size is 512×512, and the binary watermark is 64×64 bit data image, such as image 3 (b), watermark strength λ=2.

[0029] Using the following infinite fold iterative sequence map (ref: Di He, Chen He, Ling-ge Jiang, Hong-wen Zhu and Guang-rui Hu. Chaotic Characteristics of a One-dimensional Iterative Map with Infinite Collapses. IEEE Transactions on Circuits and System- I: Fundamental Theory and Applications, Vol.48, No.7, July 2001: pp.900~906): z n + 1 = sin ( α z n ) , z n ∈[-1, 1]; n=0, 1,...; α≠0 properly select the initial value z 0 ≠0 and parameter α, generate three sets of secret keys PN1, PN2 and PN3, which are respectively used for block scrambling of "Lena" ...

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Abstract

The image partitioned to small pieces in space domain and each small pieces scrambled by using chaos mapping are carried out. Carrier image data in each piece is decomposed into 'residual image block' and 'quotient image block'. Watermark information is encrypted and carried out direct sequence spread spectrum by using chaos sequence. The processed watermark information is embedded to the 'residual image block'. After processing the data of crossing the border, each 'residual image block' and corresponding 'quotient image block' is assembled. The image with the watermark embedded is obtained by assembling each anti-scrambled block with chaos mapping. When picking-up watermark, the cryptic watermark information is recovered after operations of scrambling, demodulating and threshold decision are carried out.

Description

Technical field: [0001] The invention relates to a method for embedding and extracting a digital watermark based on a remainder image, which is a digital watermark method suitable for the fields of copyright authentication of digital images and video products, and low bit error rate data hiding. Background technique: [0002] With the popularization of computer and Internet technology, digital watermark technology has been widely concerned, and it mainly has the following types of applications. One is for copyright authentication, digital signature, etc. By embedding some iconic information directly into multimedia content, it does not affect the value and use of the original content, and cannot be perceived or noticed by the human perception system. The watermark information can be the author's serial number, company logo, text with special meaning and other information. On the other hand, the development of digital watermark technology is closely related to data hiding t...

Claims

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Application Information

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IPC IPC(8): G06F17/00G06F17/10G06T5/00H04N5/913
Inventor 蒋铃鸽王东建何晨冯国瑞
Owner SHANGHAI JIAO TONG UNIV
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