tailieunhanh - Báo cáo hóa học: " Subpixel Registration Directly from the Phase Difference Murat Balci and Hassan Foroosh"

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: Subpixel Registration Directly from the Phase Difference Murat Balci and Hassan Foroosh | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 60796 Pages 1-11 DOI ASP 2006 60796 Subpixel Registration Directly from the Phase Difference Murat Balci and Hassan Foroosh School of Computer Science University of Central Florida Orlando FL 32816 USA Received 1 December 2004 Revised 31 May 2005 Accepted 21 June 2005 This paper proposes a new approach to subpixel registration under local global shifts or rotation using the phase-difference matrix. We establish the exact relationship between the continuous and the discrete phase difference oftwo shifted images and show that their discrete phase difference is a 2-dimensional sawtooth signal. As a result the exact shifts or rotations can be determined to subpixel or subangle accuracy by counting the number of cycles of the phase-difference matrix along the frequency axes. The subpixel portion is represented by a fraction of a cycle corresponding to the noninteger part of the shift or rotation. The rotation angle is estimated by applying our method using a polar coordinate system. The problem is formulated as an overdetermined system of equations and is solved by imposing a regularity constraint. The tradeoff for imposing the constraint is determined by exploiting the rank constraint leading to a closed-form expression for the optimal regularization parameter. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. MOTIVATION Registration is a crucial step in the analysis and fusion of information between multiple images. Examples can be found in remote sensing robotics and biomedical imaging among others 1-3 . Some applications such as coding and compression registration need to be established locally while other applications require only global registration. In this paper we are particularly motivated by applications that require registration at subpixel accuracy. An important example of such applications is multi-frame super-resolution 420 which

TÀI LIỆU LIÊN QUAN
crossorigin="anonymous">
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.