tailieunhanh - Báo cáo hóa học: " Research Article A Genetic Algorithm Optimization Technique for Multiwavelet-Based Digital Audio Watermarking"

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 Genetic Algorithm Optimization Technique for Multiwavelet-Based Digital Audio Watermarking | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 471842 10 pages doi 2010 471842 Research Article A Genetic Algorithm Optimization Technique for Multiwavelet-Based Digital Audio Watermarking Prayoth Kumsawat School of Telecommunication Engineering Institute of Engineering Suranaree University of Technology 111 University Avenue Muang District Nakhon Ratchasima 30000 Thailand Correspondence should be addressed to Prayoth Kumsawat prayoth@ Received 15 February 2010 Revised 10 May 2010 Accepted 30 June 2010 Academic Editor Srdjan Stankovic Copyright 2010 Prayoth Kumsawat. 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. We propose a new approach for optimization in digital audio watermarking using genetic algorithm. The watermarks are embedded into the low frequency coefficients in discrete multiwavelet transform domain. The embedding technique is based on quantization process which does not require the original audio signal in the watermark extraction. We have developed an optimization technique using the genetic algorithm to search for four optimal quantization steps in order to improve both quality of watermarked audio and robustness of the watermark. In addition we analyze the performance of the proposed algorithm in terms of signal-to-noise ratio normalized correlation and bit error rate. The experimental results show that the proposed scheme can achieve a good robustness against most of the attacks which were included in this study. 1. Introduction During the past few years digital multimedia technology and Internet networks have made great progress and they are now becoming increasingly important in daily life. Consequently intellectual property protection is a pressing concern for content owners who are exhibiting digital .