Image center calibration for a quadric panoramic optical device
US9674433B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2014 |
| Grant date | Jun 6, 2017 |
| Priority date | — |
| Expiry date | Dec 23, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A calibration method can begin by positioning a calibration image source around and substantially proximate to the exterior surface of a panoramic optical device that utilizes a conical quadric reflector having an aperture in its apex. The calibration image source can be made of a material that is substantially transparent to allow the passage of environmental light and can utilize a predetermined color palette having a calibration feature, such as a geometric shape and/or a line, which is in a known location. A quadric image of the calibration image source can then be captured. Coordinates for a visual image center of the calibration image can be determined by an image center calibration program using the location of the calibration feature. The visual image center can be the point around which a quadric image is transformed into a visually-correct panorama. The determined visual image center coordinates can be stored.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.