tailieunhanh - Báo cáo hóa học: " Research Article WMicaD: A New Digital Watermarking Technique Using Independent Component Analysis"

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 WMicaD: A New Digital Watermarking Technique Using Independent Component Analysis | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 317242 9 pages doi 2008 317242 Research Article WMicaD A New Digital Watermarking Technique Using Independent Component Analysis Thang Viet Nguyen Jagdish Chandra Patra and Pramod Kumar Meher School of Computer Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Correspondence should be addressed to Jagdish Chandra Patra aspatra@ Received 24 July 2006 Revised 22 February 2007 Accepted 15 August 2007 Recommended by B. Sankur This paper proposes a new two-mark watermarking scheme that is based on the independent component analysis ICA technique. The first watermark is used for ownership verification while the second one is used as the copy ID of the image. Using a smallsized support image the extraction is carried out on size-reduced level bringing computational advantage to our method. The new method undergoing a variety of experiments has shown its robustness against attacks and its capability of detecting tampered area in the image. Copyright 2008 Thang Viet Nguyen et al. 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 Digital watermarking in which some information called the watermark is embedded directly and imperceptibly into original data the so-called work is one of the effective techniques to protect digital works from piracy 1 2 . Once embedded the watermark is bound to the work and should be extractable to prove the ownership even if the work is modified 3 . Besides it is preferable if the watermark also contains the tracking information about the copies of the work that is the copy ID. Because of its importance in digital media watermarking has been extensively studied in recent years with many approaches such as Fourier transform .