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Optical Engineering

Generalized constrained energy minimization approach to subpixel target detection for multispectral imagery
Author(s): Chein-I Chang; JihMing Liu; BinChang Chieu; Hsuan Ren; Chuin-Mu Wang; ChienShun Lo; Pau-Choo Chung; Ching-Wen Yang; DyeJyun Ma
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Paper Abstract

Subpixel detection in multispectral imagery presents a challenging problem due to relatively low spatial and spectral resolution. We present a generalized constrained energy minimization (GCEM) approach to detecting targets in multispectral imagery at subpixel level. GCEM is a hybrid technique that combines a constrained energy minimization (CEM) method developed for hyperspectral image classification with a dimensionality expansion (DE) approach resulting from a generalized orthogonal subspace projection (GOSP) developed for multispectral image classification. DE enables us to generate additional bands from original multispectral images nonlinearly so that CEM can be used for subpixel detection to extract targets embedded in multispectral images. CEM has been successfully applied to hyperspectral target detection and image classification. Its applicability to multispectral imagery is yet to be investigated. A potential limitation of CEM on multispectral imagery is the effectiveness of interference elimination due to the lack of sufficient dimensionality. DE is introduced to mitigate this problem by expanding the original data dimensionality. Experiments show that the proposed GCEM detects targets more effectively than GOSP and CEM without dimensionality expansion.

Paper Details

Date Published: 1 May 2000
PDF: 7 pages
Opt. Eng. 39(5) doi: 10.1117/1.602486
Published in: Optical Engineering Volume 39, Issue 5
Show Author Affiliations
Chein-I Chang, Univ. of Maryland/Baltimore County (United States)
JihMing Liu, National Taiwan Science and Technology Univ. (Taiwan)
BinChang Chieu, National Taiwan Science and Technology Univ. (Taiwan)
Hsuan Ren, Univ. of Maryland/Baltimore (United States)
Chuin-Mu Wang, National Cheng-Kung University (Taiwan)
ChienShun Lo, National Cheng-Kung University (Taiwan)
Pau-Choo Chung, National Cheng Kung Univ. (Taiwan)
Ching-Wen Yang, Taichung Veterans General Hospital (Taiwan)
DyeJyun Ma, National Chung-Hsing Univ. (Taiwan)

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