Displacement dependent low contrast default

Details Displacement dependent low contrast default Displacement dependent low contrast default

1981-10-14

1984-02-28

Evans, F. L.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354402, G01J 120

Patent

active

044343620

ABSTRACT:
A system for producing a default signal for an auto focus system whenever the scene being viewed has too low a contrast for the system to operate correctly. The default signal is produced as a function of the out of focus condition of the system so that default occurs when the low contrast value is below a first magnitude when the lens is near a proper focus position but occurs near a magnitude less than the first magnitude when the lens is further away from the proper focus position.

REFERENCES:
patent: 4247762 (1981-01-01), Wilwerding
patent: 4250377 (1981-02-01), Wilwerding
patent: 4333077 (1982-06-01), Langlais et al.
patent: 4358673 (1982-11-01), Wittenberger
patent: 4358674 (1982-11-01), Frazier
patent: 4358675 (1982-11-01), Frazier et al.

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