New subspace methods for ATR

Peng Zhang, Jing Peng, S. Richard F. Sims

Research output: Contribution to journalConference article

Abstract

In ATR applications, each feature is a convolution of an image with a filter. It is important to use most discriminant features to produce compact representations. We propose two novel subspace methods for dimension reduction to address limitations associated with Fukunaga-Koontz Transform (FKT). The first method, Scatter-FKT, assumes that target is more homogeneous, while clutter can be anything other than target and anywhere. Thus, instead of estimating a clutter covariance matrix, Scatter-FKT computes a clutter scatter matrix that measures the spread of clutter from the target mean. We choose dimensions along which the difference in variation between target and clutter is most pronounced. When the target follows a Gaussian distribution, Scatter-FKT can be viewed as a generalization of FKT. The second method, Optimal Bayesian Subspace, is derived from the optimal Bayesian classifier. It selects dimensions such that the minimum Bayes error rate can be achieved. When both target and clutter follow Gaussian distributions, OBS computes optimal subspace representations. We compare our methods against FKT using character image as well as IR data.

Original languageEnglish
Article number39
Pages (from-to)349-358
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5807
DOIs
StatePublished - 10 Nov 2005
EventAutomatic Target Recognition XV - Orlando, FL, United States
Duration: 29 Mar 200531 Mar 2005

Keywords

  • Bayes method
  • FKT
  • Subspace method

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