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ENC electronic navigation chart zero-watermarking method based on water depth characteristics

A zero-watermark and nautical chart technology, applied in image watermark, water resources assessment, image data processing, etc., can solve the problems of precision reduction, poor resistance to format conversion and interpretation attack, difficulty in adding zero-bit watermark, etc., to achieve Improve resistance and overcome disturbance effects

Active Publication Date: 2020-06-05
PLA DALIAN NAVAL ACADEMY
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Problems solved by technology

[0004] There are still many deficiencies in the above three algorithms: the reversible watermarking algorithm based on spatial features causes a certain range of data (spatial) disturbance to the electronic chart data; the lossless watermarking algorithm based on attribute features is difficult to add zero-bit watermarks to ENC electronic navigation charts, because The unit used for the position in the S57 specification is latitude and longitude coordinates and is converted into an integer value by the multiplier factor COMF. At the same time, the resistance to precision reduction, format conversion resistance, and interpretation attack resistance are poor.
Semantic-based digital watermarking algorithm, emphasizing the use of image matching technology, digital watermarking of wider semantic information needs to be studied, at the same time, chart update ER is the most common operation, and the correctability of ENC chart data is insufficient

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  • ENC electronic navigation chart zero-watermarking method based on water depth characteristics
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  • ENC electronic navigation chart zero-watermarking method based on water depth characteristics

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Embodiment Construction

[0043] The ENC electronic navigation chart zero watermark method based on water depth feature of the present invention comprises zero watermark construction and zero watermark extraction check, wherein zero watermark construction is as follows figure 1 shown, including the following steps:

[0044] Step 1: Preprocess the ENC electronic navigation chart through the SuperMap software to obtain the sounding point data;

[0045] Step 2: Construct a Delaunay triangulation network for the water depth data with zero watermark, use the water depth interpolation to extract the slope aspect feature line first, and use the extracted feature line as the skeleton line to judge the slope aspect characteristic between the point pairs on the line and then extract the feature points. The slope aspect feature line is a conceptual line used to describe the slope aspect relationship tree of the water depth point, and it is a transitional virtual connection that provides a judgment basis for featu...

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Abstract

An ENC electronic navigation chart zero-watermark method based on water depth characteristics comprises a zero-watermark construction method and a zero-watermark extraction and inspection method, so that certain data (space) disturbance caused by a reversible watermark algorithm of spatial characteristics to electronic navigation chart data is overcome, and the resistance of precision reduction ofa lossless watermark algorithm of attribute characteristics is improved.

Description

technical field [0001] The invention relates to the technical field of marine surveying and mapping. Background technique [0002] ENC electronic navigation chart zero watermark technology belongs to a digital watermark technology within a special application range, and it has a wide range of applications in the fields of ENC electronic navigation chart copyright protection or content authentication. [0003] At present, the research on digital watermarking algorithms for two-dimensional electronic charts mainly includes reversible watermarking algorithms based on spatial features, lossless watermarking algorithms based on attribute features and digital watermarking algorithms based on semantics. The reversible watermarking algorithm based on spatial characteristics, electronic charts are essentially evolved from discrete vector nodes through continuous changes, and the embedding nodes of the watermark can be obtained by analyzing the evolution process of the charts, and the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
CPCG06T1/005Y02A90/30
Inventor 彭认灿董箭陈阳贾帅东李彬彬
Owner PLA DALIAN NAVAL ACADEMY