Focus adjustment method and apparatus

Details Focus adjustment method and apparatus Focus adjustment method and apparatus

1997-06-09

1998-11-17

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Having in-focus threshold adjustable

G03B 1336

Patent

active

058390030

ABSTRACT:
A focus adjustment method and apparatus use statistical methods to discriminate whether an out-of-focus condition is the result of minor fluctuation or is the result of a significant change in object image condition (distance, etc.) requiring a focus adjustment. This results in good hunting suppression without sacrificing good focus adjustment performance, and flexibly adapts to different object conditions. The focus adjustment method and apparatus drive the optical system to an in-focus state based on detected focus information, and perform statistical analysis of successive focus information inputs to compute a variance value. Driving of the optical system to correct focus recommences when the defocus amount exceeds a predetermined threshold value based on the variance value.

REFERENCES:
patent: 4575212 (1986-03-01), Kitaura et al.

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