Method for color balance determination
US5959720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1996 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Mar 22, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/73
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method of color balance determination for use by a color copying apparatus utilizing a gray estimate established as a functional relationship among at least three basic color density values measured from regions within multiple image frames of a film order. This functional relationship is preferably a fitted line to a set of measured density values from which density values from regions of high color saturation have been excluded. To discriminate these high color saturation regions, the color saturation is determined relative to a gray point calculated as a weighted average of minimum density and image average density values. Further improvement in the gray estimate is achieved by limiting the set of measured density values to regions of high modulance ("edge effect") within the image frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.