Blind Watermarking Algorithm of Color Image Based on Arnold Transform and Walsh Hadamard Transform
Digital watermarking system needs to balance invisibility and robustness.In this paper,a blind watermarking scheme of color image based on Arnold transform and Walsh Hadamard transform(WHT)is pro-posed.The scheme divides the image into 8×8 non-overlapping pixel blocks and Walsh Hadamard transform the color host image.In order to enhance the robustness of the watermark,before embedding the watermark im-age into the host image,Arnold transform is used to scramble the watermark image,and then the pixel value of the scrambled watermark image is converted into binary and embedded into the transform matrix of WHT.Ex-perimental results show that the proposed scheme has good invisibility and robustness against noise,cropping,filtering and other attacks.
color imageblind watermarkingArnold transformWalsh Hadamard transform(WHT)
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