THE METHOD FOR DIGITAL WATERMARKING USING CIRCULAR HOUGH TRANSFORM

摘要

A digital watermarking method using CHT(Circular Hough Transform) is provided to extract clear characteristics after an image attack. A process for producing a 2-dimensional rectangular watermark according to the gaussian distribution by means of a random number generator is performed(S100). The rectangular watermark is converted into a circular watermark(S200). The circular watermark is inserted into a patch by means of CHT(S300). The circular watermark is produced according to the size of the patch(S400). The circular watermark is inserted by applying a recognition mask(S500). The circular watermark is inserted by an additional method at the spatial area(S600). The detection of the watermark from the patch is performed by means of CHT(S700).