Creating multiple threshold matrices to be used in error diffused multilevel halftoning
US7760400B2 · kind B2 · utility
9Cited by
6References
30Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 13, 2005 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Jul 1, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an image processor, a data corrector corrects input image data, a determining unit determines an output tone value of a target pixel from the corrected image data and threshold, and a calculator calculates a difference between the output tone value and the corrected image data as an error value. The threshold is set in such manner that a rate of change of the mean error of the error values with respect to a change in the input tone value is within a predetermined range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.