Conical blur filter for reducing artifacts in imaging apparatus
US5322998A · kind A · utility
37Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1993 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Mar 31, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical blur filter having a substantially conical shape is used in imaging apparatus to limit high spatial frequencies incident upon an image sensor, and thereby to reduce undersampling artifacts. By having a conical shape, the filter images a circular blur pattern upon an array of adjacent photosites. A conical shape with a distinct vertex images an annular pattern, and a flattened vertex fills in the central region of the pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.