Hello sir, i have used watermark embedding in middle band of dct of whole medical image, also extracted (ROI) . but my aim is to embed watermark in RONI, so how to use ROI as a cover image. so that there is no change in ROI part.

pl. help how to recover from the problem.

[Walter Roberson]

RONI appears to mean Region of Non-Interest, such as is discussed in a paper on this topic