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Báo cáo hóa học: " Contour Estimation by Array Processing Methods"

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: Contour Estimation by Array Processing Methods | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 95634 Pages 1-15 DOI 10.1155 ASP 2006 95634 Contour Estimation by Array Processing Methods Salah Bourennane1 2 and Julien Marot1 2 1 GSM Institut Fresnel CNRS-UMR 6133 Universite Aix-Marseille III D.U. de Saint Jerome 13397 Marseille Cedex20 France 2Ecole Generaliste d Ingenieurs de Marseille EGIM Technopole de Chateau-Gombert 38 rue Joliot Curie 13451 Marseille Cedex20 France Received 8 February 2005 Revised 16 November 2005 Accepted 29 December 2005 Recommended for Publication by Gloria Menegaz This work is devoted to the estimation of rectilinear and distorted contours in images by high-resolution methods. In the case of rectilinear contours it has been shown that it is possible to transpose this image processing problem to an array processing problem. The existing straight line characterization method called subspace-based line detection SLIDE leads to models with orientations and offsets of straight lines as the desired parameters. Firstly a high-resolution method of array processing leads to the orientation of the lines. Secondly their offset can be estimated by either the well-known method of extension of the Hough transform or another method namely the variable speed propagation scheme that belongs to the array processing applications field. We associate it with the method called modified forward-backward linear prediction MFBLP . The signal generation process devoted to straight lines retrieval is retained for the case of distorted contours estimation. This issue is handled for the first time thanks to an inverse problem formulation and a phase model determination. The proposed method is initialized by means of the SLIDE algorithm. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION The estimation of the characteristics of lines and object contours from a sequence of binary images has been a widely studied problem over the past