Photography – With exposure objective focusing means – focusing aid – or... – Optical detail with photoelement system
Reexamination Certificate
2006-03-21
2006-03-21
Perkey, W. B. (Department: 2851)
Photography
With exposure objective focusing means, focusing aid, or...
Optical detail with photoelement system
C348S349000
Reexamination Certificate
active
07016604
ABSTRACT:
Autofocus methods and digital cameras employing a holographic element or hologram. The holographic element generates one or more displaced images that are processed to generate a bipolar contrast signal that provides for improved autofocus performance of the digital camera.
REFERENCES:
patent: 4310227 (1982-01-01), Zinchuk
patent: 4474446 (1984-10-01), Reynolds et al.
patent: 6021005 (2000-02-01), Cathey et al.
patent: 6115556 (2000-09-01), Reddington
Aas Eric F.
Campbell David K.
Dalton Dan L.
Hofer Gregory V.
Spears Kurt E.
Hewlett--Packard Development Company, L.P.
Perkey W. B.
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