Rangefinder apparatus

Details Rangefinder apparatus Rangefinder apparatus

2006-05-30

2006-05-30

Perkey, W. B. (Department: 2851)

Photography

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

Reliability of focus/distance signal

C396S121000, C396S124000, C396S128000, C356S003140

Reexamination Certificate

active

07054550

ABSTRACT:
A rangefinder apparatus includes an effective minimum value certifying unit for comparing a minimum value, exhibiting the smallest value in correlation values calculated for the each rangefinding area, with a reference value for a degree of correlation and certifying a minimum value smaller than the reference value as an effective minimum value, effective for a rangefinding calculation, a distance calculating unit for calculating the distance to the object according to the effective minimum value certified for each rangefinding area; and a correlation calculation restricting unit for omitting the correlation calculation within a specific distance range, farther by at least a predetermined amount than the shortest distance calculated according to the effective minimum value in the correlation calculation for a rangefinding area to be later subjected to the correlation calculation, when the effective minimum value exists in the rangefinding area earlier subjected to the correlation calculation.

REFERENCES:
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patent: 5960219 (1999-09-01), Kageyama et al.
patent: 6700651 (2004-03-01), Taka
patent: 2003/0123867 (2003-07-01), Yoshida et al.
patent: 2004/0081443 (2004-04-01), Yoshida
patent: 2005/0036128 (2005-02-01), Mihara et al.

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