Color matching apparatus for reproducing the same color under different illuminants
US5559604A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1994 |
| Grant date | Sep 24, 1996 |
| Priority date | — |
| Expiry date | Sep 27, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/603
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Colorimetric values such as L*a*b* values are transformed into color separation values such as CMYK values dependent on the characteristics of a color output device by using a multilayered feedforward neural network. The neural network learns in advance the relationships between a multiplicity of colorimetric values under different illuminants and color separation values. When colorimetric values of a standard illuminant and one of the color temperature of an observational illuminant, the spectral distribution of the observational illuminant, and colorimetric values at the time of illumination by the observational illuminant are inputted to the neural network, color separation values corresponding to one of the color temperature of the observational illuminant, the spectral distribution of the observational illuminant, and the colorimetric values obtained when illumination is provided by the observational illuminant are outputted. Consequently, colorimetric values are transformed into color separation values such that the color reproduced under the observational illuminant will visually assume the same color as that under the standard illuminant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.