摘要：In object oriented images, ROI (Region of Interest) is an area which contains important
information and attracts more attention of an image viewer. So it is desirable to embed robust watermark
in ROI to give better protection. The present paper describes a region specific low cost (computational
complexity) watermarking scheme in spatial domain by inserting data into the most valuable regions
in the cover image. Those regions are selected by Quad tree decomposition of host image. Quad tree
decomposition is a method of image segmentation which splits an image into regions such that large
regions are formed when the intensities are uniform and small regions of variable sizes are created,
in the comparatively non-uniform area of the image. Small regions represent the presence of critical
information of the image, and hence are the important places of watermarking. Simulation results duly
support this claims.
关键词：Spatial Domain Watermarking; Copyright Protection; Segmentation; Quad Tree; ROI
