Duplicating radiographic, medical or other black and white images using laser thermal digital halftone printing
US5477344A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1993 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Nov 19, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/23
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Continuous tone black and white images are duplicated using laser thermal digital halftone printing. A continuous tone black and white image signal is provided by a source such as a medical imaging source. The image signal is screened with a digital halftone screen, such that each pixel of said image signal is represented by a predetermined matrix of micropixels, whereby to produce a digital halftone image signal corresponding to the continuous tone black and white image signal. A master is created by printing the digital halftone image onto a dye ablated medium by means of laser thermal recording. A duplicate of the master is produced by contact printing onto a duplicating medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.