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Proceedings Paper

Direct Electronic Fourier Transform (DEFT) Spectra For Terrain Feature Classification
Author(s): Joseph F. Hannigan
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Paper Abstract

This paper presents the experimental results (i.e., spectra) obtained with a Direct Electronic Fourier Transform (DEFT) device. Emphasis is placed on the use of DEFT spectra for terrain feature classification. These spectra indicate the potential of DEFT technology for distinguishing between natural features and cultural or man-made features. These same spectra appear to have potential for distinguishing between certain subclasses of terrain features, e.g., open fields, bodies of water,and woods. A potential application of DEFT spectra could be the preliminary analysis of aerial imagery to automatically flag certain photographs for subsquent detailed analysis by a human photointerpreter (PI), and to automatically select or reject specific photographs before digitization for mapping or other purposes. New devices use surface acoustic waves (SAW) to generate a two-dimensional limited bandwidth Fourier transform of an image in real time without the aid of a computer. These devices permit spectra analysis for a two-dimensional image as a communications engineer would analyze the RF spectrum of a radio signal. Appropriate references and a brief description of DEFT technology will be presented for those unfamiliar with this advance in solid state, acousto-optic technology.

Paper Details

Date Published: 24 December 1980
PDF: 7 pages
Proc. SPIE 0241, Real-Time Signal Processing III, (24 December 1980); doi: 10.1117/12.959235
Show Author Affiliations
Joseph F. Hannigan, U.S. Army Engineer Topographic Laboratories (United States)

Published in SPIE Proceedings Vol. 0241:
Real-Time Signal Processing III
Tien F. Tao, Editor(s)

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