A Watermarking Scheme Based on Two-dimensional Wavelet Filter Parametrization

2009 Fifth International Conference on Information Assurance and Security Pub Date : 2009-08-18 DOI:10.1109/IAS.2009.136

Guosheng Cheng, Jianwei Yang

引用次数: 3

Abstract

In this paper, a parametrization of two-dimensional wavelet filter system is used as a method to protect wavelet-based watermarks against unauthorized detection. This system is developed in terms of a novel transformation-Shift Unitary transform (SUT) of Conjugate Quadrature filter (CQF). The commonly used wavelet filters are only special cases of this system. Based on this system, a watermarking scheme is described to embed watermark into low frequency sub-bands of wavelet transformation. We overcome degradation problem by performing median filtering to the lowest frequency sub-band of wavelet transform and embed watermark into visually insensitive locations. Experiments show this method is robust to compression,median-filtering etc.

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一种基于二维小波滤波器参数化的水印方案

本文采用二维小波滤波系统的参数化方法来保护基于小波的水印不被非法检测。该系统是根据共轭正交滤波器(CQF)的一种新颖变换——移位酉变换(SUT)而开发的。常用的小波滤波器只是该系统的特殊情况。在此基础上，提出了一种将水印嵌入小波变换的低频子带的水印方案。通过对小波变换的最低频率子带进行中值滤波，将水印嵌入到视觉不敏感的位置，克服了水印的退化问题。实验表明，该方法对压缩、中值滤波等具有较强的鲁棒性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2009 Fifth International Conference on Information Assurance and Security

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