Vector map data blind watermarking method based on DCT transformation

Abstract

The invention discloses a vector map data blind watermarking method based on DCT transformation. The conventional watermarking algorithm is difficultly applied directly on vector map data. The method comprises watermark information embedding and watermark information extraction. In the watermark information embedding step, the watermark information selected by a user is embedded into an original vector map to obtain a new vector map, and the step specifically comprises modulating the watermark information, processing the vector map data in different blocks and embedding the watermark information. In the watermark information extraction step, watermark information contents are extracted from a vector map to be detected, and the step specifically comprises processing the vector map data to be detected in different blocks, extracting the watermark information and generating a watermark information graph. The method has better robustness, and is a blind detection algorithm with better practical value.

Description

technical field [0001] The invention belongs to the technical field of multimedia information security, and relates to a method for blind watermarking of vector map data based on DCT transformation for geographical space data. Background technique [0002] Digital watermark technology is to embed specific information representing the identity of the copyright owner into the protected information in a certain way. When a copyright dispute arises, the digital watermark is extracted through the corresponding algorithm, thereby verifying the ownership of the copyright and ensuring that the copyright owner is protected. legitimate interest to avoid the threat of illegal piracy. The protected information can be any kind of digital media, such as images, sounds, videos or general electronic documents. Digital watermarking technology is used in data copyright protection and data authenticity detection applications. It is a new technology that can realize information hiding and trac...

AI Technical Summary

Problems solved by technology

The vector map data watermarking algorithm is different from the traditional image-based watermarking algorithm, mainly because the map data does not have the universality of image data applications, etc., but also because the vector map data is in data structure, storage form, expression, application environment, The use requirements and possible attack behaviors are different from multimedia data such as images. It is difficult for general watermarking algorithms to be directly applied to vector map data.