Nonlinear dithering to reduce neutral toe color shifts
US5835117A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1996 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | May 31, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40087
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus are described for employing non-uniform quantization to avoid marking dots within a region where there is inadequate control of marking density or color. The techniques are typically applied to dye transfer media used in thermal printers where the dye transfer media has a potential variance among lots. Dithering modifications are described for use with non-uniform quantization to provide control of color marking in areas where the energy input into a dye transfer medium results in an output that can vary between different lots of the transfer medium. Error diffusion may also be used with such non-uniform quantization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.