Minimum mean-square error linear optical filter

Details Minimum mean-square error linear optical filter Minimum mean-square error linear optical filter

1975-12-29

1978-01-10

Stern, Ronald J.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 71, G02B 520, G02B 2738

Patent

active

040676455

ABSTRACT:
A method of forming a minimum mean-square error linear filter photographically is disclosed.
The optimum filter may be obtained photographically. In one form, a first photographic negative of a monolayer of cells having a high percentage of cells of the given type is made at the focal plane of a transforming lens mounted so as to collect the light scattered by the monolayer; and, developed for a gamma of unity. Thereafter, a second photographic negative is made at the same focal plane of a monolayer of cells containing a normal percentage of cells of the given type using the first negative as a filter. The second negative is developed for a gamma of two. The resulting photographic plate is a realization of the desired optimum (minimum mean-square error linear) filter. Alternatively, a sandwich of two photographic plates, one positive and obtained from a monolayer of cells having a high percentage of cells of the given type and the other negative obtained from a monolayer of cells having a normal percentage of cells of the given type, is constructed to provide a physical realization of the desired optimum filter.

REFERENCES:
patent: 3501221 (1970-03-01), Lohmann
Horner, Jour. of the Optical Society of America, vol. 59, No. 5, pp. 553-558, May 1969.
Caulfield, Applied Optics, vol. 13, No. 5, May 1974, pp. 996-997.
Vander Lugt, Optica Acta, vol. 15, No. 1, pp. 1-33, Feb. 1968.

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