Image processing apparatus, image reading apparatus, image forming apparatus, and methods therefor
US7821670B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2007 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Apr 2, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus comprises: a first calculation section that calculates a plurality of spectral reflectances at a plurality of wavelengths based on intensities of light irradiating an object and reflected from the object, the light having a certain spectral energy distribution; a second calculation section that calculates color descriptor values of the object based on the spectral reflectances calculated by the first calculation section; a third calculation section that calculates a set of factors when the color descriptor values are expressed using a linear combination of a predetermined plurality of eigenvectors, factors associated with the respective eigenvectors, and either spectral energy of a reference light or theoretical spectral energy of a virtual light; and an output section that outputs the factors calculated by the third calculation section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.