Method and apparatus for optimizing object distance signals

Details Method and apparatus for optimizing object distance signals Method and apparatus for optimizing object distance signals

1984-12-26

1985-10-15

Perkey, William B.

Communications, electrical: acoustic wave systems and devices

Borehole testing

367 96, G03B 300, G01S 1588

Patent

active

045470553

ABSTRACT:
An improved method and apparatus for optimally focusing an image at a focal plane of a plurality of subjects located at substantially different distances from an image-forming adjustable focus lens system of the type that is responsive to a rangefinder derived signal, where the rangefinder is one that normally generates a subject distance signal representative of the distance to the nearest of a plurality of different distance subjects. Improved focusing is achieved by generating a composite signal representative of the relative size of each of the plurality of subjects and their distance from the rangefinder and then comparing this composite signal with that of the above-mentioned nearest subject distance signal. A signal representative of the degree of deviation of these signals from one another is then employed to optimally focus an image of the plurality of different distance subjects at the lens system focal plane.

REFERENCES:
patent: 4199246 (1980-04-01), Muggli
patent: 4280204 (1981-07-01), Elchinger
patent: 4303319 (1981-12-01), Hell et al.
patent: 4341447 (1982-07-01), Biber
patent: 4423936 (1984-01-01), Johnson
patent: 4470681 (1984-09-01), Johnson
patent: 4487494 (1984-12-01), Ishikawa

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