GEOMETRIC ATTACK RESISTANT WATERMARKING METHOD IN WAVELET TRANSFORM DOMAIN

摘要

A watermarking method robust against geometric attack in a wavelet transform domain is provided to extract an autocorrelation peak playing an important role in estimating geometric attack in ACF(Auto Correlation Function)-based watermarking by inserting a watermark into a DWT(Discrete Wavelet Transform) domain. A watermark pattern is inserted into a subband of a DWT domain. An ACF of watermark is executed in the DWT domain to detect a watermark for estimation of geometric attack. A watermark signal is detected using undecimated wavelet transform in order to compensate for image transform of the watermark.