Color adjustment apparatus for automatically changing colors
US5384601A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1993 |
| Grant date | Jan 24, 1995 |
| Priority date | — |
| Expiry date | Aug 24, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/643
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic color adjustment apparatus for use in an imaging device for adjusting the color of a subject such as skin or leave, which is well retained in human memory, to be as natural as possible. The color adjustment apparatus has a weighting coefficient setting device for setting a weighting coefficient according to the difference between the input chromaticity value and the preselected reference chromaticity value set by a chromaticity value setting device. The preselected reference chromaticity value is selected, with respect to a particular subject, such as skin, to be equal to the most natural color of that subject in a chromaticity plane defined by hue and saturation characteristics. The color-adjusted output signal is produced from a calculator which calculates an internal division operation applied to the preselected reference chromaticity value and the input chromaticity signal using the weighting coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.