Image reading apparatus
US5815291A · kind A · utility
10Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1995 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Nov 13, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/603
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus measures, color by color, an average transmission-density signal based upon image information obtained from a color original through which light is transmitted, converts the measured average transmission-density signal of every color into a subject-lightness signal of every color, and effects a conversion into a reference color stimulus signal, which is indicated by the apex of a triangle substantially circumscribed by a spectrum locus of a predetermined chromaticity diagram, based upon the converted subject-lightness signal of every color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.