Image processing apparatus carrying out multi-value error diffusion process
US6501566B1 · kind B1 · utility
13Cited by
12References
24Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 31, 1998 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Mar 31, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40087
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus that can carry out an error diffusion process without degrading the quality of image data generates a density histogram according to pixels included in the input image data. Reference densities S1 and S2 are calculated from pixels having a certain density in a set range. Threshold values T1-T3 are calculated according to the obtained reference densities S1 and S2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.