Image processing device performing the conversion of gradation value by means of error diffusion method
US6134351A · kind A · utility
5Cited by
6References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 20, 1997 |
| Grant date | Oct 17, 2000 |
| Priority date | — |
| Expiry date | Nov 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4053
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When gradation values of an original image are converted, a pixel data read unit reads out a piece of pixel data, and a pixel data conversion unit converts the gradation value of the piece of pixel data. A condition judging unit decides whether a pixel corresponding to the piece of pixel data satisfies a predetermined condition, and a data conversion correction unit corrects by a stochastic process the conversion performed by the pixel data conversion unit when the condition judging unit decides that the piece of pixel data satisfies the predetermined condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.