Real time optical pre-detection processing of multispectral imag

Details Real time optical pre-detection processing of multispectral imag Real time optical pre-detection processing of multispectral imag

1990-01-10

1992-02-25

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

With aperture mask

356330, G01J 304

Patent

active

050908073

ABSTRACT:
The present invention is an apparatus for forming a spectrally weighted value from received multispectral radiation. The spectral weighting is done optically prior to detection of the received radiation by dispersing the received multispectral radiation into a plurality of wavelength bin areas. This dispersed radiation is then passed through a weighting filter which includes first and second filter elements for each of the wavelength bin areas. The filtered radiation is then converged to corresponding detectors with the spectrally weighted value formed by the difference between the signals of the first and second detectors. A pair of filters, two detectors and a subtracter are employed to produce a generalized weight factor having positive or negative weights. This system can form one or more spectrally weighted values from the radiation from a single pixel, or one spectrally weighted value form the radiation from a plurality of pixels. The addition of a polarization filter permits the formation of spectrally weighted values for various polarizations of a single pixel.

REFERENCES:
patent: 3314327 (1967-04-01), Killpatrick et al.
patent: 4790654 (1988-12-01), Clarke
Crist et al., "A Physically Based Transformation of Thematic Mapper Data--The T.M. Cap," IEEE Transactions on Geoscience and Remote Sensing, vol. GE-22, #3, May 1984.

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