Television – Camera – system and detail – Optics
Patent
1996-08-05
1997-12-02
Boudreau, Leo
Television
Camera, system and detail
Optics
348365, 348366, 348354, 348356, 396 98, 396124, 396155, G03B 1300, G03B 1700, H04N 5232, H04N 5238
Patent
active
056941684
ABSTRACT:
A zone for measuring distance is enlarged by adding an area where a contrast ratio is relatively high in the case of the photographing against the light. Thus, the sensitivity for judging a contrast ratio is increased and improper focusing is prevented. The brightness when an evaluative value is a maximum and the brightness at a moment when the evaluative value is not at maximum, for example when it is at a minimum, are compared. If the difference of brightness becomes too large, the maximum evaluative value is ignored and the detection is repeated. The determination of when the difference in brightness is too large is made to be dependent on parameters such as gain of the AGC circuit, gain of the amplifier and iris opening which affect the noise in the evaluative value so as to more accurately judge when the when the maximum evaluative value should be ignored.
REFERENCES:
patent: 4969045 (1990-11-01), Haruki et al.
patent: 5061954 (1991-10-01), Toyama et al.
patent: 5144450 (1992-09-01), Kikuchi et al.
patent: 5184172 (1993-02-01), Miyazaki
Boudreau Leo
Fuji Photo Film Co. , Ltd.
Shalwala Bipin
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