Apparatus for indicating maximum resolution for projected images

Details Apparatus for indicating maximum resolution for projected images Apparatus for indicating maximum resolution for projected images

1979-08-27

1981-08-04

Corbin, John K.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

250233, 250234, 355 56, G03B 2734

Patent

active

042819270

ABSTRACT:
There is disclosed a maximum resolution indicator for photographic apparatus. The indicator utilizes a photocell which is scanned by a rotating disc having an aperture located on a surface thereof and communicating with the surface of the photocell. The output of the photocell is monitored to determine a maximum amplitude for high frequency components indicative of the content of the projected image. When the high frequency components as propagated through a high pass filter are of maximum amplitude, the system is at an optimum focusing point indicating to the operator that the image may be impressed upon a suitable film or that a picture can be taken in the case of a camera.

REFERENCES:
patent: 3549889 (1970-12-01), Akiyama
patent: 3555280 (1971-01-01), Richards, Jr.
patent: 3776639 (1973-12-01), Stauffer
patent: 3906219 (1975-09-01), Stauffer
patent: 3967110 (1976-06-01), Rogers et al.

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