Image quantization processing with error diffusion using oscillating quantization threshold to develop dots that spiral outward
US7636179B2 · kind B2 · utility
6Cited by
8References
17Claims
0Family size
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Key dates
| Filing date | Nov 20, 2006 |
| Grant date | Dec 22, 2009 |
| Priority date | — |
| Expiry date | Jun 11, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4052
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing method of quantizing multi-tone image data by an error diffusion method, includes the steps of a) detecting change of the image data; and b) oscillating cyclically in image space a threshold for the quantization in an oscillation range controlled according to the detection result of the step a).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.