Spatial frequency filter

Details Spatial frequency filter Spatial frequency filter

1981-07-29

1983-10-11

Arnold, Bruce Y.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

35016211, 3561245, G02B 2746

Patent

active

044094752

ABSTRACT:
A spatial frequency filter including: an optical system having detector means and means for projecting onto the detector means an image of an object area; and means for operating the optical system alternately in a first mode to develop a first system transfer function and a second mode to develop a second system transfer function which is matched to the first system transfer function in low spatial frequencies and divergent therefrom in high spatial frequencies, for imposing on the detector means a first representation of the image in the first mode and a second representation of the image in the second mode, thereby providing a fluctuating elemental image output from each element of the detector means which derives from a high spatial frequency object; and also including means for limiting the wavelength range of input radiation to the detector means.

REFERENCES:
patent: T909010 (1973-04-01), Kelch
patent: 3700902 (1972-10-01), Buchan
patent: 3821794 (1974-06-01), Yoneyama
patent: 3940788 (1976-02-01), Abe et al.
patent: 4128337 (1978-12-01), Zehnpfennig

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