IMAGE WATERMARKING METHOD RESISTANT TO GEOMETRIC ATTACK COMBINED WITH REMOVAL ATTACK

摘要

An image watermarking method for being robust to geometric attack combined with removal attack is provided to be robust to the geometric attack and the removal attack combined with the geometric attack by improving the strength of an autocorrelation peak. An extracted signal(E) is extracted from an original image(I) having an XxY size using a watermark detector. The signal(E) includes a signal(E') having autocorrelation with a period. The signal(E') is mixed with a periodic watermark(W), and the mixed signal is inserted into the original image. The watermark detector uses a Wiener filter. The signal(E') is composed as projected vectors(V1'-VN') to increase cross-correlation between the vectors.