Interpolation of greyscale levels
US6437879B1 · kind B1 · utility
49Cited by
3References
30Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1998 |
| Grant date | Aug 20, 2002 |
| Priority date | — |
| Expiry date | Sep 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4051
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method of colour printing using arrays of threshold value for interpolating between grey levels, the threshold values for each of the colours are provided by defining rows of threshold values, with each row having the same repeating sequence but offset. The repeating sequences are different for each colour but the offset is the same for all colours. The arrays best take the form Tijc=(i*pc−j*qc)%(rcS).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.