Digital image watermarking in fractional Fourier transformation domain
Yanmin Wang · Jisuanji gongcheng yu sheji · 2006
Based on discrete fractional Fourier transfrom(DFRFT),a digital image watermarking method in fractional Fourier transform domain is proposed.The FRFT has signal representation property both in space and frequency domain.The original image and the wate-rmark is transformed with different orders to improve watermarking security.The watermark in DFRFT domain is added to the secondary visual important part of the original image.The robustness of the watermark image under different attacks such as JPEG compression,image rotation and guassian low-pass filtering is analyzed and the results demonstrate that the embedding scheme has good performance of robustness.