Zero watermarking method based on two-dimensional vector digital map features

Abstract

The invention discloses a zero watermarking method based on two-dimensional vector digital map features. Traditional watermarking algorithm has poor safety. The method comprises watermarking information embedment and watermarking information detection. In watermarking information embedment, zero watermarking information of an original vector map is extracted and saved into a library, and the process specifically comprises the following steps that: watermarking information is modulated, concentric sub-block processing is carried out to the data of the vector map, and zero watermarking information is generated and saved. In watermarking information detection, the zero watermarking information extracted from the vector map to be detected and the water watermarking information in the watermarking information library are operated to obtain the final watermarking information, and the process specifically comprises the following steps that: the watermarking information in the watermarking information library is taken out according to the data of the vector map to be detected, concentric sub-block processing is carried out to the data of the vector map to be detected, the watermarking information is generated and the watermarking information is reversely scrambled. The method has better concealment, resistance and robustness.

Description

technical field [0001] The invention belongs to the technical field of multimedia information security, and in particular relates to a zero watermark method based on two-dimensional vector digital map features for geographical space data. Background technique [0002] At present, many digital watermarking methods have been proposed, and these methods can be generally divided into two categories: frequency domain watermarking method and spatial domain watermarking method. These methods of embedding digital watermarks all modify the spatial domain information or its frequency domain information of the data to embed the watermark information. visual mask. The contradiction between the perceptibility and robustness of the watermark is solved to a certain extent by adding a visual mask. However, adding a visual mask complicates the embedding process of the watermark and consumes too long calculation time, which is not conducive to practical applications. Moreover, if someone wi...

AI Technical Summary

Problems solved by technology

However, adding a visual mask complicates the embedding process of the watermark, consumes too long calculation time, and is not conducive to practical applications. Moreover, if someone with ulterior motives understands the method of adding a visual mask, it cannot be ruled out that capable people use methods to tamper with maps containing watermark information. , the same small changes that are difficult for the human eye to detect, resulting in the failure of watermark information detection

Therefore, this makes the security of digital watermarking limited