Image watermarking scheme using lifting filter

Abstract

Recently, digital contents can be easily accessed and modified by various digital technology. For protecting copyrights or intellectual properties of digital data, digital watermarking technique has attracted considerable attention since it provides the essential mechanism for the ownership authentication. In this paper, we propose a robust watermarking scheme for digital images based on the lifting scheme which provides a simple construction of second generation wavelets. The proposed method does not require the original image for watermark detection. The original image is transformed into wavelet domain though two sets of lifting filters; one is for usual wavelet filter, the others is for embedding watermarks whose locations are created randomly in a selected wavelet domain with the secret key. For reliable watermark detection, an estimation scheme for watermarking is proposed to use the statistical correlation with a priori information of watermark embedding. Experiment results show that the propose scheme is robust against various attacks and provides a reliable detection measure.