Anti-aliasing apparatus and methods for optical imaging
US6021005A · kind A · utility
67Cited by
12References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1998 |
| Grant date | Feb 1, 2000 |
| Priority date | — |
| Expiry date | Jan 9, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.