Zero watermarking method based on two-dimensional vector digital map features
A digital map and two-dimensional vector technology, applied in maps/plans/charts, image data processing, image data processing, etc., can solve the problems of digital watermark security limitations, complicated watermark embedding process, watermark information detection failure, etc. Achieve great practical value, solve the contradiction between imperceptibility and robustness, and achieve the effect of good concealment
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[0022] The method of the invention includes watermark information embedding and watermark information detection.
[0023] Watermark information embedding refers to extracting the zero watermark information of the original vector map and storing it in the database, which specifically includes the following steps:
[0024] Step (1) Modulate the watermark information, combine the binary watermark image with the key and use Arnold transform to scramble the watermark information, and obtain a binary bit stream w: set the watermark image as an N×N binary image, then the length of the watermark information is l=N×N, the final watermark information bit stream w=(w 1 ,w 2 ,...,w i ,...,w 1 ), where w i ∈{0,1}, 0≤i<l;
[0025] Step (2) Carry out concentric circle block processing on the vector map data: according to the length of the watermark information, the center point of the vector map is used as the center of the circle, and the map is divided into l circular ring regions; th...
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