Photography – Having photocell at specific position within camera
Reexamination Certificate
2005-08-04
2008-08-26
Koval, Melissa Jan (Department: 2862)
Photography
Having photocell at specific position within camera
C348S290000, C348S335000, C359S490020, C359S490020, C359S575000, C359S576000
Reexamination Certificate
active
07418202
ABSTRACT:
An optical low pass filter or blur filter, and method of making the filters, using an article having a birefringent surface for refracting incoming light when used with an image sensor. The birefringent surface of the article, such as a film, is structured or tilted such that, when the blur filter is placed within an optical path between a lens and the image sensor, the birefringent surface causes refraction of a light signal in the optical path into multiple light signals each being incident upon different sub-pixels within the pixels in the image sensor to prevent or reduce artifacts, such as undesirable color moiré effects, in the resulting digital image. The structures on the surface have a variable pitch or angles. The variable pitch can include a periodic, aperiodic, or quasi-aperiodic pitch, to reduce diffractive artifacts in the resulting image.
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Biernath Rolf W.
Black William B.
Brott Robert L.
Huizinga John S.
Merrill William Ward
3M Innovative Properties Company
Koval Melissa Jan
Vietzke Lance
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