Selective enhancement of black
US6871928B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 5, 2003 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Nov 7, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/58
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A technique for selective enhancement of black including printing a non-black color at pixel locations identified by a candidate pixel array and which correspond to marked pixels in a predetermined pixel pattern, wherein the candidate pixel array comprises a plurality of N-pixel candidate tiles respectively associated with N-pixel image tiles of a black half-toned bit map, wherein an N-pixel candidate tile includes marked pixels only if the associated N-pixel image tile comprises a portion of a half-toned uniform region and the number of marked pixels in the associated N-pixel image tile is at least a predetermined percentage of N, and wherein the number of marked pixels in some of the N-pixel candidate tiles is less than the number of marked pixels of the associated N-pixel image tile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.