tailieunhanh - Báo cáo hóa học: "Research Article Joint Watermarking and Encryption of Color Images in the Fibonacci-Haar Domai'"

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 Joint Watermarking and Encryption of Color Images in the Fibonacci-Haar Domai | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 938515 13 pages doi 2009 938515 Research Article Joint Watermarking and Encryption of Color Images in the Fibonacci-Haar Domain Federica Battisti 1 Michela Cancellaro 1 Giulia Boato 2 Marco Carli 1 and Alessandro Neri EURASIP Member 1 1 Department of Applied Electronics Universita degli Studi Roma TRE 00146 Roma Italy 2Department of Information Engineering and Computer Science University of Trento Trento 38123 Italy Correspondence should be addressed to Marco Carli carli@ Received 2 December 2008 Revised 6 March 2009 Accepted 23 July 2009 Recommended by Bulent Sankur A novel method for watermarking and ciphering color images based on the joint use of a key-dependent wavelet transform with a secure cryptographic scheme is presented. The system allows to watermark encrypted data without requiring the knowledge of the original data and also to cipher watermarked data without damaging the embedded signal. Since different areas of the proposed transform domain are used for encryption and watermarking the extraction of the hidden information can be performed without deciphering the cover data and it is also possible to decipher watermarked data without removing the watermark. Experimental results show the effectiveness of the proposed scheme. Copyright 2009 Federica Battisti 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 Nowadays our life is becoming more and more permeated with Internet or widely-used communication systems GSM UMTS CDMA2000 WLAN etc. and the technology allows an easy access to an almost unlimited amount of information. On one hand the increased ease in sharing and transmitting data is an important goal and a basic need in our society on the other .