A copyright protection method for raster maps based on bfa and lsb

Abstract

The invention discloses a grid map copyright protection method based on Bacterial Foraging Algorithm (BFA) and Least Significant Bit (LSB). First, use the sobel operator to detect the edge of the raster map and extract the map edge data; then, divide the edge image into several blocks according to the bit number of the watermark information; then, use the BFA algorithm to optimize the edge points in each block, Extract better watermark embedding points until the number of extracted points is equal to the number of bits of watermark information; finally, according to the position of the extracted points, use the LSB algorithm to embed the watermark information into the corresponding position of the original raster map for each block. pixels. The grid map digital watermark generated by the invention can better resist noise attack, filtering attack and geometric attack, has better concealment, and can effectively protect the copyright of the grid map.

Description

technical field [0001] The invention relates to the field of map digital watermarking, in particular to a copyright protection method for grid maps based on BFA and LSB. Background technique [0002] The LSB-based digital watermarking algorithm is a spatial domain algorithm, which embeds the watermark information directly into the least significant bit of the pixel value of the carrier data, and ensures the concealment of the embedded information and the minimum impact on the original carrier information while embedding the copyright information change. This method is a blind watermarking algorithm, and the process of embedding and extracting the watermark 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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