next, the image is JPEG compressed at default quality level (in order to simulate a common unintentional attack) and then maliciously manipulated using The Gimp
it is the task of the watermark detector to indicate only those regions that have been modified to change the content or meaning of the image (tamper detection); the bright pixels in the images on the right highlight tampered areas in the image
the images tested are Barbara, Fishing Boat, Houses and Man, resp.
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