Method for embedding and extracting watermarks by adopting difference expansion aiming at shape point map layer data

A watermark embedding and point layer technology, which is applied in image data processing, image data processing, instruments, etc., can solve the problem of reversible watermark embedding and extraction that cannot be applied to GIS point layer data

Inactive Publication Date: 2011-06-29
NANJING NORMAL UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to propose a watermark embedding and extraction method for shape point layer data, so that the difference expansion technology can Can be applied to the digital watermarking algorithm of various data types of GIS vector data

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  • Method for embedding and extracting watermarks by adopting difference expansion aiming at shape point map layer data
  • Method for embedding and extracting watermarks by adopting difference expansion aiming at shape point map layer data
  • Method for embedding and extracting watermarks by adopting difference expansion aiming at shape point map layer data

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Embodiment Construction

[0033] Further detailed description will be given below in conjunction with the accompanying drawings and embodiments.

[0034] In this example, a typical shape point data is selected, and the whole process of data reading, processing, watermark embedding, result saving, watermark extraction, and data recovery is further described in detail. This embodiment selects point-level vector data of administrative villages in Jiangsu Province (such as image 3 ) as experimental data, the number of data records is 17521. The content of the watermark is the text information of "Nanjing Normal University", and the corresponding binary watermark sequence W is "11000100110011111...100111" with a length of 96.

[0035] 1. Aiming at the difference value expansion watermark embedding method of shape point layer data.

[0036] Such as figure 1 , is an embedding flow chart of the method for embedding a difference-extended watermark for shape point layer data proposed by the present invention...

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Abstract

The invention discloses a digital watermark method for embedding and extracting watermarks by adopting a difference expansion technology aiming at shape point map layer data. The watermark embedding method comprises the following processes of: analyzing all points in shape carrier data to determine a projection axis; sequencing all the points according to the projection axis to form a continuous point sequence with unique value; sequentially pairing every two data of the point sequence, judging whether the watermarks are suitable to be embedded into the points of the group by adopting the difference expansion technology by using the corresponding data precision requirements of geographic information system (GIS) vector data as judgment conditions, if so, modifying the coordinate difference of the related points to embed watermark information, otherwise, embedding the watermark information by using a least significant bit (LSB) displacement method; and simultaneously recording the embedded information in the process. According to the method, the difference expansion technology can be applied in reversible watermark embedment and extraction of the GIS point map layer data and applied in interpolation identification of the GIS vector point map layer data, copyright protection, GIS vector point map layer data-based concealed communication and the like.

Description

technical field [0001] The invention belongs to the field of geographic information copyright protection, and in particular relates to a digital watermark method for embedding and extracting watermarks using difference extension technology for shape point layer data; restore the original data. Background technique [0002] At present, digital watermarking technology is becoming the main technical means to solve the security problem of geographic information system (GIS) vector data products. Scholars at home and abroad have proposed a variety of digital watermarking algorithms for GIS vector data. Because the embedding of watermark data will inevitably bring disturbance to the original data, which reduces the quality of GIS vector data to a certain extent, therefore, reversible watermarking technology is introduced. Reversible watermarking technology, that is, lossless data hiding, refers to a watermarking algorithm that can completely restore the original carrier data. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 李安波曹江华闾国年
Owner NANJING NORMAL UNIVERSITY
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