Extended depth-of-field surveillance imaging system
US8294764B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Feb 23, 2010 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Apr 23, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0075
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An extended depth-of-field (EDOF) surveillance imaging system (8) that has a lens system (10) with a total lens power φT and an amount of spherical aberration SA where 0.2λ≦SA≦2λ. The lens system includes first lens group (G1) and a second lens group (G2). The first lens group has first and second confronting meniscus lens elements (L1, L2) that have an overall optical power φ1 such that |φ1/φT|≦0.05. The second lens group has a doublet (D1) and a most imagewise positive lens element (L5). An aperture stop (AS) is arranged either between the first and second lens groups or within the second lens group. An image sensor (30) is arranged to receive the image and form therefrom a digitized electronic raw image. An image processor receives and digitally filters the digitized electronic raw image to form a digitized contrast-enhanced image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.