Permuted Image DCT Watermarking

This paper presents a novel watermarking technique for digital images using Pseudo Random(PN) Sequence. The host image is permuted by PN Sequence. The watermark is embedded into the mid band DCT coefficients of the image. The image is re-permuted using the same PN sequence to obtain the watermarked image. To ensure security, a PN sequence has been used which is known only to an authorized person. Extensive simulation results show that the proposed scheme can resist signal processing attacks such as median, average, motion and Gaussian filter as well as compression, blurring and sharpening of watermarked image. The proposed paper also analyzes the results obtained by varying the degree of permutation proving that the DCT along with permutation making the frequency domain watermarking arguably robust.

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