tailieunhanh - Báo cáo hóa học: " Research Article A Secret Image Sharing Method Using Integer Wavelet Transform"

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 Secret Image Sharing Method Using Integer Wavelet Transform | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 63281 13 pages doi 2007 63281 Research Article A Secret Image Sharing Method Using Integer Wavelet Transform Chin-Pan Huang1 and Ching-Chung Li2 1 Department of Computer and Communication Engineering Ming Chuan University Taoyuan 333 Taiwan 2 Department of Electrical and Computer Engineering University of Pittsburgh Pittsburgh PA 15261 USA Received 28 August 2006 Revised 13 February 2007 Accepted 25 June 2007 Recommended by Bulent Sankur A new image sharing method based on the reversible integer-to-integer ITI wavelet transform and Shamir s r m threshold scheme is presented that provides highly compact shadows for real-time progressive transmission. This method working in the wavelet domain processes the transform coefficients in each subband divides each of the resulting combination coefficients into m shadows and allows recovery of the complete secret image by using any r or more shadows r m . We take advantages of properties of the wavelet transform multiresolution representation such as coefficient magnitude decay and excellent energy compaction to design combination procedures for the transform coefficients and processing sequences in wavelet subbands such that small shadows for real-time progressive transmission are obtained. Experimental results demonstrate that the proposed method yields small shadow images and has the capabilities of real-time progressive transmission and perfect reconstruction of secret images. Copyright 2007 . Huang and . Li. 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 With the rapid development of computer and communication networks Internet has been established worldwide that brings numerous applications such as commercial services .