Automatic focal point control apparatus with correction of seque

Details Automatic focal point control apparatus with correction of seque Automatic focal point control apparatus with correction of seque

1988-03-23

1989-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354408, G01J 120, G03B 1318

Patent

active

048126365

ABSTRACT:
An automatic focal point control apparatus for optical equipment such as cameras can properly respond to different objects and changes in objects, thus providing stable operation. In the apparatus, defocus signals are calculated according to object image data concerning an object to be photographed, information effective for focal point calculation is extracted from the object image data, and the defocus signals are weighted and averaged by weighting coefficients corresponding to the effective information signals, thereby obtaining a statistical defocus signal.

REFERENCES:
patent: 4297571 (1981-10-01), Utagawa et al.
patent: 4306143 (1981-12-01), Utagawa et al.
patent: 4336450 (1982-06-01), Utagawa et al.
patent: 4447719 (1984-05-01), Ogasawara
patent: 4474449 (1984-10-01), Kusaka

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