Method and device for eliminating ring effect
US11461878B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2020 |
| Grant date | Oct 4, 2022 |
| Priority date | — |
| Expiry date | Feb 8, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/08
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for eliminating a ring effect is provided. The method includes: capturing, by a camera, a standard ring image generated by light illuminating a standard Fresnel lens; establishing a compensation lookup table according to the standard ring image and obtaining a standard ring center point; capturing, by the camera, a ring image generated by the light illuminating a Fresnel lens to be tested; obtaining a ring center point according to the ring image; obtaining a conversion relationship between the ring center point and the standard ring center point; and performing a compensation procedure on the ring image according to the compensation lookup table and the conversion relationship to eliminate the ring effect in the ring image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.