An Optimal Prediction based Reversible Image Watermarking In Hadamard Domain

This paper presents a reversible watermarkingscheme based on a reversible Hadamarh Transform. In theproposed method, the watermark is embedded using theprediction error of Hadamard coefficients. To achieve a moreaccurate prediction, a Gravitational Search Algorithm (GSA) isused to optimize the prediction coefficients. The proposedmethod does not need any location map. This property leads toincrease the capacity as well as the quality of the watermarkedimage. To evaluate the performance of the proposed method, acomparative experiment with some well-known reversiblemethods is performed. The obtained results confirm theefficiency of the proposed method.

کلیدواژه ها:

reversible watermarking ، Reversible Hadamard Transform ، prediction error ، Gravitational Search Algorithm