Automatic recovery of invisible image watermarks from geometrically distrorted images

摘要

One method of attacking an imbedded invisible water- mark is to create a derivative image that is geometrically distorted relative to the original. One attack, developed at Cambridge Univer- sity, is called ' StirMark." Image-distorting methods modify images so subtly that the changes are essentially unnoticeable to a viewer. However, their effect on invisible watermarks can be devastating, Rendering them unextractable. In this paper, an automated counter- Measure to image-distorting attacks will be described.