Method and apparatus for reproducing an image employing a transformation of color solids
US5696839A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1995 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Apr 26, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/6058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for the transformation of color solids of different color reproduction processes in color image reproduction, whereby spatial positions of the colors respectively representable in a color reproduction process are defined by a color solid characteristic of the color reproduction processes in a three-dimensional color coordinate system (L, a, b). First, an initial color solid characteristic of an initial process and a target color solid characteristic of a target process are calculated in the color coordinate system (L, a, b). The initial color solid in the color coordinate system (L, a, b) is then distorted. Subsequently, the distorted initial color solid is transformed into a standardized intermediate color solid in a cylindrical color coordinate system (h, p, q) by a first transformation according to a three-dimensional, first transformation rule (F.sub.1). A second standardized intermediate color solid is produced in the cylindrical color coordinate system (h, p, q) by imaging the first intermediate color solid onto itself according to a second transformation rule (F.sub.2). The standardized intermediate color solid is then back-transformed by a third transformation acco…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.