Raster map copyright protection method based on BFA and LSB

Abstract

The present invention discloses a raster map copyright protection method based on a bacterial foraging algorithm (BFA) and a least significant bit (LSB). The method comprises: carrying out edge detection on the raster map by using the sobel operator, and extracting map edge data; dividing the edge image into a plurality of blocks according to the number of bits of watermark information; using the BFA algorithm to optimize the edge points in each block, and extracting optimal watermark embedding points until the number of extracted points is equal to the number of bits of the watermark information; and according to the position of the extracted points, embedding the watermark information into the corresponding pixel of the original raster map for each block by using the LSB algorithm. According to the method disclosed by the present invention, the generated raster map digital watermark can better resist the noise attack, the filtering attack and the geometric attack, has good concealment, and can effectively protect the raster map copyright.

Description

technical field [0001] The invention relates to the field of map digital watermarking, in particular to a method for copyright protection of grid maps based on BFA and LSB. Background technique [0002] The LSB-based digital watermarking algorithm is a spatial domain algorithm, which directly embeds the watermark information into the least significant bits of the pixel value of the carrier data, which ensures the concealment of the embedded information and the minimal impact on the original carrier information while embedding copyright information. change. This method is a blind watermarking algorithm, and the process of embedding and extracting watermarks is relatively simple. However, the LSB algorithm has obvious defects. Its robustness is relatively poor, and it is difficult to resist common malicious attacks such as filtering and noise. At present, the LSB digital watermarking method and its improvement have been applied to the copyright protection of image and vector...

AI Technical Summary

Problems solved by technology

However, the LSB algorithm has obvious defects. Its robustness is relatively poor, and it is difficult to resist common malicious attacks such as filtering and noise.

At present, the LSB digital watermarking method and its improvement have been applied to the copyright protection of image and vector geospatial data, but its application in the copyright protection of raster maps is still rare, so a raster map based on BFA and LSB is studied The method of copyright protection has certain practical significance and practical application value

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