Map data rasterizing based robust blind water mark embedding and extraction method
A technology of watermark embedding and map data, applied in image data processing, image data processing, instruments, etc., can solve problems such as weak robustness
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[0025] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0026] 1. Watermark embedding: The watermark embedding process mainly includes three parts: watermark information encryption, digital map data rasterization processing, and data modification in each grid unit.
[0027] 1) Watermark information encryption
[0028] The invention adopts a watermark encryption method based on double chaotic sequences. Original watermark information {w i , i=1, 2,..., I×J} is a binary image of I×J size. In order to enhance the security of the watermark, the watermark information is encrypted first. Use Logistic mapping to generate pseudo-random sequence {x k}, while using the hybrid optical bistability model to generate a pseudo-random sequence {y k}, and then the random sequence {x k} and {y k} The corresponding elements are "XOR" to generate an encrypted key stream {d k}, and then perform ...
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