Phase-noise type broad spectral bandwidth optical low-pass anti-aliasing filter
US6040857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1997 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | May 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1871
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.