Auto-focusing apparatus with hill-climbing and full-scanning aut

Details Auto-focusing apparatus with hill-climbing and full-scanning aut Auto-focusing apparatus with hill-climbing and full-scanning aut

1998-09-04

2000-10-10

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502017, 396169, G02B 704

Patent

active

061304174

ABSTRACT:
An auto-focusing apparatus comprises an image sensing element for photo-electrically converting an image focused by an focal lens into an image signal, an image sensing circuit for processing an image signal, an A/D converter for converting the image signal output from the image pickup circuit into a digital image signal, and an AE processing circuit and an AF processing circuit respectively for performing an automatic exposure process and an auto-focusing process, on the basis of the digital image signal, and determines the brightness of the subject on the basis of AE and AF evaluation values respectively obtained by the AE processing circuit and the AF processing circuit, and performs the auto-focusing process according to a hill-climbing AF method for a bright subject and the auto-focusing process according to the full-scanning AF method for a non-bright subject.

REFERENCES:
patent: 5604537 (1997-02-01), Yamazaki et al.

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