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Báo cáo hóa học: " Research Article A Robust Zero-Watermarking Algorithm for Audio"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Robust Zero-Watermarking Algorithm for Audio | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 453580 7 pages doi 10.1155 2008 453580 Research Article A Robust Zero-Watermarking Algorithm for Audio Ning Chen and Jie Zhu The Department of Electronic Engineering Shanghai Jiao Tong University DongChuan Road no. 800 Shanghai 200240 China Correspondence should be addressed to Ning Chen chenning_750210@163.com. Received 30 July 2007 Accepted 25 November 2007 Recommended by Mark Liao In traditional watermarking algorithms the insertion of watermark into the host signal inevitably introduces some perceptible quality degradation. Another problem is the inherent conflict between imperceptibility and robustness. Zero-watermarking technique can solve these problems successfully. Instead of embedding watermark the zero-watermarking technique extracts some essential characteristics from the host signal and uses them for watermark detection. However most of the available zerowatermarking schemes are designed for still image and their robustness is not satisfactory. In this paper an efficient and robust zero-watermarking technique for audio signal is presented. The multiresolution characteristic of discrete wavelet transform DWT the energy compression characteristic of discrete cosine transform DCT and the Gaussian noise suppression property of higher-order cumulant are combined to extract essential features from the host audio signal and they are then used for watermark recovery. Simulation results demonstrate the effectiveness of our scheme in terms of inaudibility detection reliability and robustness. Copyright 2008 N. Chen and J. Zhu. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Unauthorized copying and distribution of digital data creates a severe problem in the protection of intellectual