Effect of demons registration on biomedical content watermarking

In the field of medical diagnosis and therapeutics, patient´s valuable information is protected and authenticated by digital watermarking. Medical video contents are also needed to be watermarked. Image registration is a process of overlaying various images of the same scene, taken at different times, to locate a particular object in it and thus it is useful in diagnosis from medical video contents. The current work proposes a system which successfully broke a biomedical video into multiple image frames and those frames were used as a cover to hide the binary watermark. Our system also observed the effect of Demons algorithm based image registration´s effect on the watermarked image frames. In order to observe the effects of image registration, we performed a comparative study between extracted binary watermarks from registered and non registered images. Later the visualization of the difference image between both of the extracted watermarks, helped to establish the effect of registration. The correlation between extracted binary watermark image from registered and non-registered frame also played a major role to observe the effect of image registration. In the post-processing of the obtained correlation, it was observed that the highest correlation was obtained for the target frame.