Phase-noise type broad spectral bandwidth optical low-pass anti-

Details Phase-noise type broad spectral bandwidth optical low-pass anti- Phase-noise type broad spectral bandwidth optical low-pass anti-

1997-05-27

2000-03-21

Ho, Tuan

Television

Camera, system and detail

Combined image signal generator and general image signal...

348342, H04N 5217

Patent

active

06040857&

ABSTRACT:
A device is described for a very low cost anti-aliasing filter to be used to suppress aliasing artifacts present in discretely sampled solid-state electronic imaging devices. This device includes a transparent substrate upon which a multiplicity of transparent phase spots are placed. The diameter and thickness of the transparent phase spots are designed in such a way to cause just the right amount of blurring to suppress the aliasing artifacts, yet render a reasonable sharp image for spatial frequencies below the sampling frequency of the imager. This suppression is further accomplished over a broad spectral range. The phase noise filter thus formed can be placed either in object space or in image space.

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patent: 5585885 (1996-12-01), Muramatsu
patent: 5684293 (1997-11-01), Kessler
Sayanagi, Optical Noise Filter, J. Appl. Phys. (Japan) 27, 623-632, 10, 1958.
Okano, Optical Phase-Noise Filter for Color Portrait Photography, Proc. IOC (International Commission for Optics) 13th Conference Digest, Sapporo, Japan, 1984.

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