Abstract
Reversible watermarking algorithms allow extraction of the hidden information to ensure authenticity and restore original medium. Prediction-error expansion (PEE) methods give high payload with little or no visible distortion. In these methods performance of the algorithm relies heavily on predictor`s response. In this study image pixels are predicted using 8 pixels within a 3×3 neighborhood of a pixel. Image pixels are divided into two sets and information bits in each set are embedded using PEE and histogram shifting (HS). Better prediction in conjunction with HS increases imperceptibility of the watermarked image. Experimental results indicate superior performance of the proposed scheme in comparison to recent methods published in the literature.
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