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 Robust Watermarking Scheme Using Wave Atoms | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2011 Article ID 184817 9 pages doi 2011 184817 Research Article Robust Watermarking Scheme Using Wave Atoms H. Y. Leung and L. M. Cheng Department of Electronic Engineering City University of Hong Kong Kowloon Hong Kong Correspondence should be addressed to H. Y. Leung leunghonyin@ Received 8 July 2010 Accepted 17 September 2010 Academic Editor Dennis Deng Copyright 2011 H. Y. Leung and L. M. Cheng. 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. A robust blind watermarking scheme using wave atoms is proposed. The watermark is embedded in the wave atom transform domain by modifying one of the scale bands. The detection and extraction procedures do not need the original host image. We tested the proposed algorithm against common image processing attacks like JPEG compression Gaussian noise addition median filtering and salt and pepper noise and also compared its performance with other watermarking schemes using multiscale transformation. They were carried out using Matlab software. The experimental results demonstrate that the proposed algorithm has great robustness against various imaging attacks. 1. Introduction Since the rapid development of digital technology and internet it makes anyone possible to create replicate transmit and distribute digital content in an effortless way 1 . Thus how to protect the copyright of these digital protections efficiently has been a hot issue in the recent two decades. As a copyright protection technology digital watermarking recently draws a lot of attention since it can embed desirable information in transmitted audio image and video data files and also ensures the data integrity at the same time 2 . A digital watermark should have two main properties which are .
