tailieunhanh - Báo cáo hóa học: " Research Article One-Time Key Based Phase Scrambling for Phase-Only Correlation between Visually Protected Images"

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 One-Time Key Based Phase Scrambling for Phase-Only Correlation between Visually Protected Images | Hindawi Publishing Corporation EURASIP Journal on Information Security Volume 2009 Article ID 841045 11 pages doi 2009 841045 Research Article One-Time Key Based Phase Scrambling for Phase-Only Correlation between Visually Protected Images Izumi Ito EURASIP Member and Hitoshi Kiya EURASIP Member Graduate School of System Design Tokyo Metropolitan University 6-6 Asahigaoka Hino-shi Tokyo 191-0065 Japan Correspondence should be addressed to Hitoshi Kiya kiya@ Received 24 March 2009 Revised 18 August 2009 Accepted 23 October 2009 Recommended by Sen-Ching Samson Cheung One-time key based phase scrambling is proposed for privacy-protected image matching. The image matching is performed using invisible templates that are protected by phase scrambling. A key for phase scrambling is not required for the image matching and the key can even be discarded after scrambling if the template does not need to be reconstructed. Theoretical analyses are presented to provide guidelines for designing key parameters that affect the visual effect and image matching. Experimental results demonstrate the effectiveness and appropriateness of the proposed method. Copyright 2009 I. Ito and H. Kiya. 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 A number of approaches to image matching such as correlation in the space domain and using features as typified by corners and edges have been investigated. Phase-only correlation POC is a frequency domain approach to image matching. Phase-only correlation with discrete Fourier transform DFT was first proposed by Kuglin and Hines 1 . The translation between signals and the direct measure of the degree of signal congruence can be simultaneously estimated by POC based on the Fourier shift property. In addition the rotation and scaling can be estimated using