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Digital Retinal Fundus Images helps to detect various ophthalmic diseases bydetecting morphological changes in optical cup, optical disc and macula.Present work proposes a method for the authentication of medical images basedon Discrete Wavelet Transformation (DWT) and Spread Spectrum. Proper selectionof the Non Region of Interest (NROI) for watermarking is crucial, as the areaunder concern has to be the least required portion conveying any medicalinformation. Proposed method discusses both the selection of least impact areaand the blind watermarking technique. Watermark is embedded within theHigh-High (HH) sub band. During embedding, watermarked image is dispersedwithin the band using a pseudo random sequence and a Session key. Watermarkedimage is extracted using the session key and the size of the image. In thisapproach the generated watermarked image having an acceptable level ofimperceptibility and distortion is compared to the Original retinal image basedon Peak Signal to Noise Ratio (PSNR) and correlation value.

A Session Based Blind Watermarking Technique within the NROI of Retinal  Fundus Images for Authentication Using DWT, Spread Spectrum and Harris Corner  Detection