Establishment of calibration of a photothermographic laser printer and processor system
US6023285A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Nov 26, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4078
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a photothermographic laser imaging system including a laser printer for exposing photothermographic media to digital data, a thermal processor for thermally developing the exposed photothermographic media to render a visual image of the digital data and a densitometer for reading the density of the visual image, a method for establishing calibration of the system comprising the steps of: reading optimum thermal processing parameters including processor temperature from a bar code associated with unexposed photothermographic media; setting the thermal processor to operate at the read parameters; exposing a calibration media by the laser printer, the calibration media including a multiple step gray scale pattern including a minimum density step, D.sub.min, and an upper density step, D.sub.UDP ; reading with the densitometer the densities of the multiple step gray scale pattern from the developed calibration media; calculating a code value to optical density look-up-table from the read densities; and if the D.sub.min and D.sup.UDP values are within tolerances, using the calculated look-up-table to process successive media; but if the D.sub.min is greater than a predetermined value,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.