tailieunhanh - Báo cáo hóa học: " Linear and Nonlinear Oblivious Data Hiding"

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: Linear and Nonlinear Oblivious Data Hiding | EURASIP Journal on Applied Signal Processing 2004 14 2102-2112 2004 Hindawi Publishing Corporation Linear and Nonlinear Oblivious Data Hiding Litao Gang InfoDesk Inc. 660 White Plains Road Tarrytown NY 10591 USA Email lxg8906@ Ali N. Akansu Department of Electrical and Computer Engineering ECE New Jersey Institute of Technology University Heights Newark NJ 07102-1982 USA Email akansu@ Mahalingam Ramkumar Department of Computer Science and Engineering Mississippi State University MS 39762-9637 USA Email ramkumar@ Received 31 March 2003 Revised 6 October 2003 The majority of the existing data hiding schemes are based on the direct-sequence DS modulation where a low-power random sequence is embedded into the original cover signal to represent hidden information. In this paper we investigate linear and nonlinear modulation approaches in digital data hiding. One typical DS modulation algorithm is explored and its optimal oblivious detector is derived. The results expose its poor cover noise suppression as the hiding signature signal always has much lower energy than the cover signal. A simple nonlinear algorithm called set partitioning is proposed and its performance is analyzed. Analysis and simulation studies further demonstrate improvements over the existing schemes. Keywords and phrases data hiding watermarking ML detection data security. 1. INTRODUCTION Multimedia data hiding is the art of hiding information in a multimedia content cover signal like image video audio and so forth. Its potential applications include but not limit to authentication copyright enforcement piracy tracking and others. Various data hiding techniques are deployed in different scenarios. For instance fragile data hiding is often used for multimedia content authentication while the robust data hiding techniques are mostly employed for copyright and ownership proof illegal replication prevention and the like. The requirements and techniques in different .