A Multi-band Wavelet Watermarking Scheme
Xiangui Kang, Wenjun Zeng, Jiwu Huang · 2008
This paper presents a new multi-band wavelet watermark-ing scheme. Compared with conventional watermarking schemes implemented in two-band wavelet domain, by incorporating the principal component analysis (PCA) technique the proposed blind watermarking in the multi-band wavelet domain can achieve higher perceptual trans-parency and stronger robustness. Specifically, the devel-oped watermarking scheme can successfully resist com-mon signal processing such as JPEG compression with quality factor as low as 15, and some geometric distor-tions such as cropping (cropped by 50%). In addition, the proposed multi-band wavelet based watermarking scheme can be parameterized, thus resulting in more security. That is, an attacker may not be able to detect the embed-ded watermark if the attacker does not know the parame-ter. Different from many other watermarking schemes, in which the watermark detection threshold is chosen empir-ically, the false positive rate of the proposed watermarking scheme can be calculated analytically so that watermark detection threshold can be chosen based solely on the tar-geted false positive.