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Map data rasterizing based robust blind water mark embedding and extraction method

A technology of watermark embedding and map data, applied in image data processing, image data processing, instruments, etc., can solve problems such as weak robustness

Inactive Publication Date: 2009-02-11
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

The method has strong robustness to the update operations such as adding, deleting, and modifying map data, and cropping operations, but the robustness against noise attacks is not strong, and its innovation is still imperative

Method used

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  • Map data rasterizing based robust blind water mark embedding and extraction method
  • Map data rasterizing based robust blind water mark embedding and extraction method
  • Map data rasterizing based robust blind water mark embedding and extraction method

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Embodiment Construction

[0025] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] 1. Watermark embedding: The watermark embedding process mainly includes three parts: watermark information encryption, digital map data rasterization processing, and data modification in each grid unit.

[0027] 1) Watermark information encryption

[0028] The invention adopts a watermark encryption method based on double chaotic sequences. Original watermark information {w i , i=1, 2,..., I×J} is a binary image of I×J size. In order to enhance the security of the watermark, the watermark information is encrypted first. Use Logistic mapping to generate pseudo-random sequence {x k}, while using the hybrid optical bistability model to generate a pseudo-random sequence {y k}, and then the random sequence {x k} and {y k} The corresponding elements are "XOR" to generate an encrypted key stream {d k}, and then perform ...

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Abstract

The robust blind watermark inlaying and picking-up method based on map data latticing effectively solves the problems of the ownership authentication and preventing infringement of digital map data, which includes: encipher the original watermark information by using the chaos series produced by a two-chaos system to increase the security of watermark; lattice the digital map data to make every data point distributed all lattice units; revise the map data collection in each lattice unit according watermark information and inlay one bit of watermark information in each lattice unit. When pick up watermark information, directly obtain the inlaid information from the data to be detected. Advantage: good non-feeling property and strong robust to renewing attack of data such as increasing, deleting, revising, cutting and noise etc..

Description

1. Technical field [0001] The invention relates to a robust blind watermark embedding and extraction method based on map data rasterization, and is a digital watermark method suitable for copyright protection of digital maps and preventing illegal copying. 2. Background technology [0002] Digital watermarking technology is a copyright protection technology for digital works that has gradually developed with the process of digitization. At present, the research on watermarking technology is mainly concentrated in the field of multimedia data such as images. Due to the uniqueness of digital map data, the current general watermarking algorithm does not Not suitable for copyright protection of digital map data. [0003] A digital map is a map that represents spatial information in digital form. Compared with analog maps, digital maps are more vulnerable to illegal actions such as random copying, tampering, and dissemination by some unscrupulous users and businesses. The copyri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 闵连权李强祝先真朱长青
Owner THE PLA INFORMATION ENG UNIV
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