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Reversible image watermarking guaranties restoration of both original coverand watermark logo from the watermarked image. Capacity and distortion of theimage under reversible watermarking are two important parameters. In this studya reversible watermarking is investigated with focusing on increasing theembedding capacity and reducing the distortion in medical images. Integerwavelet transform is used for embedding where in each iteration, one watermarkbit is embedded in one transform coefficient. We devise a novel approach thatwhen a coefficient is modified in an iteration, the produced distortion iscompensated in the next iteration. This distortion compensation method wouldresult in low distortion rate. The proposed method is tested on four types ofmedical images including MRI of brain, cardiac MRI, MRI of breast, andintestinal polyp images. Using a one-level wavelet transform, maximum capacityof 1.5 BPP is obtained. Experimental results demonstrate that the proposedmethod is superior to the state-of-the-art works in terms of capacity anddistortion.

Reversible Image Watermarking for Health Informatics Systems Using Distortion Compensation in Wavelet Domain