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The Blind Watermarking Algorithms Based on Edge Detection and Quantify the Positive and Negative

ZHAO Xiao-hua,ZHANG Gui-cang*(College of Computer Science and Engineering,Northwest Normal University,Lanzhou Gansu 730070,China)  
A blind watermarking algorithm based on DCT domain edge detection and positive and negative quantitative is proposed.First the algorithm used Arnold scrambling method to encrypt watermark image,and carried on the positive and negative transformation,then used edge detection operator to carrier image edge extraction.Select different quantization value in accordance with the setting of the threshold value to embed watermark.Extract the watermark does not require the participation of the original image,realizing blind extraction.The experiments show that the algorithm has good robustness and invisibility to attacks such as cutting,compression,noise,filtering,scaling.
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