A Watermarking Scheme Based on Two-dimensionalWavelet Filter Parametrization

摘要：

In this paper, a parametrization of twodimensional 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 subband of wavelet transform and embed watermark into visually insensitive locations. Experiments show this method is robust to compression, median-filtering etc.

关键词： parametrization median filtering watermark wavelet

作者: Guosheng Cheng Jianwei Yang

作者单位: College of Math & Physics Nanjing University of Information Science and Technology Nanjing,210044,P.R.China

会议类型: 国际会议

会议名称: The Fifth International Conference on Information Assurance and Security(第五届信息保障与安全国际会议)

会议地点: 西安

会议语种:英文

页码: 301-304

在线出版日期: 2009-08-18（万方平台首次上网日期，不代表论文的发表时间）