图像匹配技术在航空电子系统中的应用

 本文概述了匹配定位原理、方法及相似度度量、快速搜索、正确匹配概率、预处理、几何失真及其改善等问题,还指出了特征匹配及匹配寻的跟踪等两个值得重视的发展趋势。最后给出了相关匹配技术在组合导航及导引头中应用的结构组成。

SCENE MATCHING AND ITS APPLICATION TO AEROSPACE ELECTRONIC SYSTEMS

This paper describes the principles and implementation of scene matching used in position location systems in brief. Several essential problems in scene matching technique are reviewedt measures of similarity （MAD, MSD, PROD, NPROD, Pair Functions etc. ）are outlined; fast search me-thods（resolution from coarse to fine, quantization from coarse to fine, feature extraction, modified SSDA etc. ）are introduced; probability of acquisition for max. or min. algorithm is given; preprocessing of images （filtering, restoration, whitening etc. ）is considered; geometrical distortion（sync-hronization error, rotation, scale factor, perspective distortion）and its effects are analyzed, and the methods for overcoming such effects are presented.After then, two noticeable important techniques for homing seeker, the feature matching and the correlation tracking, are remarked. Several methods of feature extraction are introduced for such features in scene matching as invariant moments, edge features, line features, planar features, vertex features etc. . The emphasis is put on feature selection, update and replacement in terminal target homing.Finally, the block diagrams of a combined optimum aided navigation system and a homing seeker using correlation tracking are given.