Method of designing an imaging system, spatial filter and imaging system including such a spatial filter
US10095027B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2016 |
| Grant date | Oct 9, 2018 |
| Priority date | — |
| Expiry date | Jun 27, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/815
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of designing an imaging system including an optical system having a longitudinal optical axis, an image sensor and a spatial filter, the imaging system being configured to form an image of a focusing plane on the image sensor. The optical transfer function of the optical system combined with the spatial filter is calculated as a function of the image spatial frequencies, and of the focusing defect (Ψ), so as to determine a contrast map and a phase map of the optical system combined with the pupil function of the spatial filter, the contrast map and the phase map being a function, of the spatial frequency (f), and of the focusing defect (Ψ), and it is determined, based on these maps, a value of longitudinal extension (|P|) of the imaging system focusing depth domain in the useful range of spatial frequencies ([−fc; fc]) and an average contrast C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.