Process and apparatus for the colorimetric analysis of printed material
US4505589A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1982 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Mar 30, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41P2233/51
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
On a measuring table (1), a bridge (2) extends over a printed sheet (5) to be measured. A measuring carriage (3) carrying a three color-simultaneous measuring head is arranged on the bridge (2) for linear movement in a back-and-forth manner along a desired path on the printed sheet. For control of the movement of the measuring head during measuring runs and for the evaluation of the measured data, a computer (7) with an integrated image display terminal and a processor system (6) controlled by the computer, is provided with the necessary interfaces. The analysis of a color measuring strip (MS) located along the desired path on the printed sheet is effected in two phases. In a first, so-called recognition run the measuring strip is scanned stepwise with high resolution in all three color channels, for the purpose of an analysis of its configuration. By means of flat locations in the density variations, effective positions (e.g., the centers) in the measuring fields are determined as possible measuring positions for subsequent measuring runs. During the measuring runs the measuring strip is measured only at the measuring positions determined during the recognition and the measured da…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.