Method and apparatus for determining the color of a translucent object such as a tooth
US5383020A · kind A · utility
113Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Dec 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/508
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method and to apparatus for determining the color of a translucent object such as a tooth by measuring the reflectance of said object at wavelengths corresponding essentially to sensitivity maxima of the human eye to hue and to saturation, by calculating the luminance of white included in the luminance of the object illuminated by a determined standard illuminant, by calculating a saturation percentage for the color of the object as seen by the human eye, and by determining the pigmentations of said color relative to white.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.