Imaging system with color corrected light source
US6542259B1 · kind B1 · utility
13Cited by
17References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1999 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Feb 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/48
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An imaging system scans a color original and provides a signal with limited chromaticity for use by a print engine or a display. A light source illuminates the original with primary color intensities, for example 21% red, 72% green, and 7% blue. A sensor integrates the reflected intensities to provide a luminance signal. Matrix multiplication to convert to luminance is avoided. In a variation, illumination is provided with 6/19 red, 9/19 green, and 4/19 blue to provide a gray scale image of, for example, business graphics. Such an image has distinguishable variation for colors of equal lightness (L*).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.