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24 December 1980 Direct Electronic Fourier Transform (DEFT) Spectra For Terrain Feature Classification
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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.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph F. Hannigan "Direct Electronic Fourier Transform (DEFT) Spectra For Terrain Feature Classification", Proc. SPIE 0241, Real-Time Signal Processing III, (24 December 1980);


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