Conical blur filter for reducing artifacts in imaging apparatus

Details Conical blur filter for reducing artifacts in imaging apparatus Conical blur filter for reducing artifacts in imaging apparatus

1993-03-31

1994-06-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

359709, H01J 314

Patent

active

053229983

ABSTRACT:
An optical blur filter having a substantially conical shape is used in imaging apparatus to limit high spatial frequencies incident upon an image sensor, and thereby to reduce undersampling artifacts. By having a conical shape, the filter images a circular blur pattern upon an array of adjacent photosites. A conical shape with a distinct vertex images an annular pattern, and a flattened vertex fills in the central region of the pattern.

REFERENCES:
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patent: 4111561 (1978-09-01), Plummer
patent: 4518864 (1985-05-01), Inuiya
patent: 4896217 (1990-01-01), Miyazawa et al.
patent: 4989959 (1991-02-01), Plummer
patent: 4998800 (1991-03-01), Nishida et al.
patent: 5140469 (1992-08-01), Lamarre et al.

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