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Multi-channel filter group-based multifunction digital watermark method

A multi-functional watermarking and filter bank technology, applied in the field of information security, can solve the problems of single function and cannot realize blind extraction, and achieve the effect of reducing interference and flexible subband selection.

Inactive Publication Date: 2007-08-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

Although these algorithms combine multi-channel filter bank theory with digital watermarking technology and have a certain degree of robustness, they have a single function, are only robust copyright protection, and cannot achieve blind extraction. It can be seen that the multi-channel filter bank The nature of nature has yet to be discovered in this field, and its advantages should be further utilized to improve the algorithm functions in this field

Method used

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  • Multi-channel filter group-based multifunction digital watermark method
  • Multi-channel filter group-based multifunction digital watermark method
  • Multi-channel filter group-based multifunction digital watermark method

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Embodiment Construction

[0066] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0067] The steps of the present invention are as follows (the principle block diagram sees accompanying drawing 1):

[0068] Embedding steps

[0069] (1) Use the M channel analysis filter bank to decompose the original image into M 2 sub belt;

[0070] (2) Scramble the copyright information to be embedded to generate a robust watermark; from M 2 Select a low-frequency sub-band from the sub-bands, and embed the robust watermark in the low-frequency sub-band with an appropriate robust watermark embedding algorithm;

[0071] (3) Generate a fragile watermark according to the low-frequency sub-band information of the image, and embed the fragile watermark in the low-frequency sub-band;

[0072] (4) Synthesize each sub-band into a watermarked image by using the corresponding M-channel synthesis filter bank.

[0073] extraction step

[0074] (1) Use the ...

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Abstract

This invention puts forward a digital watermark method for protecting copyright information of digital multimedia products and content integrality at the same time, which embeds a Rodust watermark and a weak watermark in a multimedia product simultaneously to pick up the copyright information of the multimedia by testing the Rodust watermark and judge if the multimedia is trusted or juggled viciously by testing the weak watermark, which can protect the copyright to Jpeg image compression and image juggle operation and provides juggle prompt.

Description

Technical field [0001] The invention relates to the field of information security, in particular to digital watermark technology, which is suitable for copyright protection and content integrity authentication of multimedia information. Background technique [0002] The era of digitization and networking of multimedia information makes the acquisition, transmission and processing of digital multimedia information more convenient, and how to effectively protect copyright has become a very urgent problem. An information security technology developed in recent years—digital watermarking provides a solution to this problem, and has attracted widespread attention from academic circles and business circles at home and abroad. [0003] According to its functions, digital watermarks are mainly divided into two types: robust watermarks and fragile watermarks. Robust watermarks are generally used to protect the copyright of digital products, so that copyright information (watermarks) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 陶然辛怡王超兰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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