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This paper introduces current watermarking techniques available from theliteratures. Requirements for medical watermarking will be discussed. We thenpropose a watermarking scheme that can recover the original image from thewatermarked one. The purpose is to verify the integrity and authenticity ofDICOM images. We used ultrasound (US) images in our experiment. SHA-256 of thewhole image is embedded in the least significant bits of the RONI (Region ofNon-Interest). If the image has not been altered, the watermark will beextracted and the original image will be recovered. SHA-256 of the recoveredimage will be compared with the extracted watermark for authentication.

Reversible Region of Non-Interest (RONI) Watermarking for Authentication of DICOM Images