Abstract

This chapter presents the important techniques of watermarking in spatial and transform domains along with major performance parameters such as peak signal to noise ratio (PSNR), weighted peak signal-to-noise ratio (WPSNR), mean square error (MSE), universal image quality index, structural similarity index measure (SSIM), normalized correlation (NC), noise visibility function (NVF) and bit error rate (BER) of the watermark algorithm. An important aspect of any watermarking algorithm is its robustness against attacks. Recently, some standard benchmark tools are available to determine the robustness of watermarking algorithm. Further, the chapter introduces an overview of different types of attacks and benchmark tools for medical image watermarking.

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