Method for generating a tonal response curve for a scanner
US7564601B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 2006 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Jan 16, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40056
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for generating a tonal response curve for a scanner includes (a) directing light from the scanner to a calibration target having a single uniform neutral tone; (b) measuring with the scanner an amount of incident light reflected from the calibration target to obtain a simulated optical density value associated with the calibration target and the amount of incident light; (c) changing the amount of the incident light; (d) repeating acts (b) and (c) until a predetermined number of simulated optical density values are accumulated; and (e) generating the tonal response curve for the scanner by matching each of the simulated optical density values with one of a plurality of reference optical densities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.