Image processing apparatus and image processing method
US8379273B2 · kind B2 · utility
1Cited by
1References
11Claims
0Family size
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Key dates
| Filing date | Oct 9, 2009 |
| Grant date | Feb 19, 2013 |
| Priority date | — |
| Expiry date | Oct 18, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/40075
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a halftone image after halftone processing, significant dot values within a reference window that encompasses a pixel of interest are accumulated, and by referring to a conversion table based on the accumulated values, a multilevel pixel value that corresponds to that pixel of interest is restored. At this time, the size of the reference window is determined such that a product of a bit depth in the halftone processing and the number of pixels within the reference window becomes a minimum value that exceeds the number of tones in a multilevel image after restoration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.