Method for determining measurement parameters for a spectacle wearer
US5617155A · kind A · utility
33Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Apr 27, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C13/005
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for determining measurement parameters from the image of a spectacle wearer wearing a spectacle frame is disclosed in which the position of the center of the pupil of each eye is obtained automatically by analyzing the luminance gradient in the region of the pupils and the positions of the horizontal and vertical straight lines tangential to the frame are also obtained automatically by luminance gradient analysis and extraction of the contours of the frame, enabling said parameters to be calculated accurately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.