Higher-order zero crossings for HSI ATD

Dalton S. Rosario; Nasser M. Nasrabadi

doi:10.1117/12.486333

16 September 2003 Higher-order zero crossings for HSI ATD

Proceedings Volume 5094, Automatic Target Recognition XIII; (2003) https://doi.org/10.1117/12.486333
Event: AeroSense 2003, 2003, Orlando, Florida, United States

Abstract

In the last ten years, many approaches have been proposed to address automatic target detection (ATD) in hyperspectral sensor imagery (HSI). Conspicuously missing from that list is a relatively unknown approach to time series analysis, called higher order zero-crossings (HOC). In this paper, we investigate HOC sequences and their application to target detection in HSI. HOC sequences are based on a surprisingly fruitful connection between bank filtering and signal zero-crossings. They are generated from the application of a bank of filters to a finite signal or time series having zero mean. The application of each filter from the bank changes the signal oscillation pattern and alters the zero-crossing count. Accordingly, the application of each member filter gives rise to a zero-crossing count. We consider the oscillation pattern changes, or variations thereof, as a function of frequency modulation (FM) that may be intrinsic to hyperspectral signatures and that apparently has never been exploited in the target community. Investigating FM functions in signatures triggered a natural behavior to investigate the existence of intrinsic AM (amplitude modulation) as well. Preliminary results indicate that intrinsic AM-FM characteristics of objects' hyperspectral signatures may be useful for target detection.

Citation Download Citation

Dalton S. Rosario and Nasser M. Nasrabadi "Higher-order zero crossings for HSI ATD", Proc. SPIE 5094, Automatic Target Recognition XIII, (16 September 2003); https://doi.org/10.1117/12.486333

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