Photography – With exposure objective focusing means – focusing aid – or... – Reliability of focus/distance signal
Reexamination Certificate
2005-02-22
2005-02-22
Perkey, W. B. (Department: 2851)
Photography
With exposure objective focusing means, focusing aid, or...
Reliability of focus/distance signal
C396S121000, C396S128000
Reexamination Certificate
active
06859620
ABSTRACT:
A rangefinder apparatus forms an image of light from an object to be subjected to rangefinding onto a pair of line sensors, each line sensor including light-detecting elements, and generates autofocus (AF) data for computing a correlation value from signals from the light-detecting elements; acquires the AF data from a pair of employed sensor areas; determines a pair of window areas for selecting the AF data for computing a correlation value, and successively computes correlation values while shifting the pair of window areas; detects a shift of the window areas yielding the highest correlation according to the correlation values computed and calculates distance to the object according to the shift amount yielding the highest correlation; and calculates oscillation of the AF data, and disables rangefinding if the oscillation is too large.
REFERENCES:
patent: 5552853 (1996-09-01), Muramatsu et al.
patent: 5561497 (1996-10-01), Muramatsu et al.
patent: 5563677 (1996-10-01), Muramatsu et al.
patent: 5960219 (1999-09-01), Kageyama et al.
patent: 5-203870 (1993-08-01), None
Fuji Photo Optical Co., Ltd.
Leydig , Voit & Mayer, Ltd.
Perkey W. B.
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