Anti-aliasing apparatus and methods for optical imaging

Details Anti-aliasing apparatus and methods for optical imaging Anti-aliasing apparatus and methods for optical imaging

1998-01-09

2000-02-01

Spyrou, Cassandra

Optical: systems and elements

Lens

With diverse refracting element

359738, 348342, G02B 300, G02B 900

Patent

active

060210052

ABSTRACT:
An anti-aliasing filter for use in an incoherent imaging system reduces the resolution of the optical image to prevent aliasing, without requiring a reduction in the amount of light captured by the system, and without adversely affecting image quality or requiring complex optical systems. The filter modifies the wavefront of light emanating from the object in a curved, non-symmetrical manner, in such a way as to effectively attenuate spatial frequencies in the image to values less than some desired small level for all spatial frequencies beyond a predetermined bandlimit. The filter may be reflective or transmissive.

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