Procedure for making copies from photographic originals
US5365353A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1993 |
| Grant date | Nov 15, 1994 |
| Priority date | — |
| Expiry date | Sep 8, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/735
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a process for making copies of photographic originals in a photographic copying machine, comprising the steps of sectionally scanning the original being copied by a measurement system in a measurement station of the photographic color copying machine, feeding measured light that is transmitted or remitted from each scanned section of the original being copied to a detector configuration, converting the measured light into electrical signals as a function of wavelength and intensity of the measured light, digitizing the electrical signals to obtain color data for processing in a computation and evaluation unit, and analyzing the color data in an analysis unit to establish correction values. The step of analyzing further includes steps of (a) subjecting the color data to a reversible linear or non-linear standardization transformation that is order or film type specific, (b) converting the color data into normalized color values to provide initial data for the analysis unit, (c) forming film specific normalized correction values in the analysis unit from the normalized color values, taking into account color, density, and structural characteristics of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.