Aspherical blur filter for reducing artifacts in imaging apparat

Details Aspherical blur filter for reducing artifacts in imaging apparat Aspherical blur filter for reducing artifacts in imaging apparat

1994-11-21

1995-08-01

Mancuso, Joseph

Television

Camera, system and detail

Optics

348335, 348340, 359709, 359723, H04N 572

Patent

active

054383668

ABSTRACT:
An optical blur filter having a substantially aspherical shape is used in imaging apparatus to limit high spatial frequencies incident upon an image sensor, and thereby to reduce undersampling artifacts. The filter images a circular blur pattern upon an array of nearby photosites. Due to its aspherical shape, the surface of the filter smoothly varies in relation to the field of view of a zoom lens in the apparatus so that the blur pattern maintains a substantially constant radius despite changes in the focal length of the zoom lens.

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