Vector map watermark embedding method and system and vector map watermark extracting method and system
A vector map and watermark embedding technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of vector map data damage robustness, increase the difficulty of cracking, achieve effective protection, and high robustness Effect
Active Publication Date: 2017-06-23
武汉数字云图信息技术有限公司
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[0003] The present invention provides a vector map watermark processing method and system, which solves the problem of damage to vector map data or low robustness when protecting map copyright in the prior art
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[0061] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0062] figure 1 A schematic diagram of a watermark embedding method for a vector map provided by an embodiment of the present invention, such as figure 1 As shown, a watermark embedding method for a vector map includes the following steps:
[0063] S1. Acquire a first watermark, and generate a first binary sequence watermark after performing scrambling and binary processing on the first watermark;
[0064] S2. Obtain the first areal feature table in the vector map, and sort the areal features in the first areal feature table according to the first binary sequence watermark to obtain a second areal feature table;
[0065] S3. Embedding the second planar feature table into the vector map to implement watermark embed...
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The invention relates to a vector map watermark embedding method and system and a vector map watermark extracting method and system. The vector map watermark embedding method comprises steps of obtaining a first watermark, and subjecting the first watermark to scrambling processing and binary processing to generate a first binary sequence watermark; obtaining a first planar element table in the vector map and sorting the planar elements in the first planar element table according to the first binary sequence watermark to obtain a second planar element table; and embedding the second planar element table into the vector map to achieve watermark embedding. The vector map watermark embedding method and extracting method achieve embedment of digital watermarks in the vector map, so that the copyright of the vector map is protected, and the precision of the vector map is not destroyed. The high robustness is achieved, and the problem that the vector map data are destroyed or the robustness is low during the protection of the map copyright in the prior is solved.
Description
technical field [0001] The invention relates to the field of copyright protection of vector map data in geographic information systems, in particular to a watermark embedding method, extraction method and system for vector maps. Background technique [0002] Digital watermark technology has been widely used in digital image, sound and video, but due to the special structure and storage form of GIS vector data, the watermark algorithm for ordinary digital images cannot be directly applied to vector data. The existing research on digital watermark embedding algorithms for vector maps is still in its infancy, and most of the algorithms are at the expense of data accuracy. As an effective means to protect the copyright of digital products, the research on digital watermarking of vector maps will inevitably attract much attention. For digital vector map watermarking technology, the difficulty of research lies in the contradiction between the accuracy requirements of vector maps a...
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Login to View More IPC IPC(8): G06T1/00G06F21/16
CPCG06F21/16G06T1/0021
Inventor 王勇叶承李梦张飞飞
Owner 武汉数字云图信息技术有限公司