Automatic focusing device with adaptive signal filtering

Details Automatic focusing device with adaptive signal filtering Automatic focusing device with adaptive signal filtering

1994-08-04

1997-04-22

Garber, Wendy

Television

Camera, system and detail

Optics

348700, H04N 5232

Patent

active

056233094

ABSTRACT:
In the automatic focusing device having an object image variation detecting circuit for quantitatively detecting a variation of an object image on the image pickup plane of an image pickup element so that the focusing operation is controlled in accordance with the amount of variation of the object image detected by the object image variation detecting circuit, there are provided a stop control circuit for controlling the period for stopping the focusing operation when panning depending on whether the amount of variation of the object image is large or small, a characteristic varying circuit for varying the frequency band of the picked-up image signal to be used in the focus detection depending on whether the amount of variation of the object image at the time of the focusing operation is large or small, and a pass characteristic varying circuit for varying the focus detection area on the image pickup plane depending on whether the amount of variation of the object image is large or small.

REFERENCES:
patent: 4500925 (1985-02-01), Hanna et al.
patent: 4531158 (1985-07-01), Murayami et al.
patent: 4614975 (1986-09-01), Kaite
patent: 4841370 (1989-06-01), Murashima et al.
patent: 4872058 (1989-10-01), Baba et al.

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