Image processing apparatus and method
US6333788A · kind A · utility
35Cited by
3References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1997 |
| Grant date | Dec 25, 2001 |
| Priority date | — |
| Expiry date | Feb 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The luminance frequencies are calculated in units of blocks in a multi-valued image, and the binarization threshold values in units of blocks are calculated on the basis of the calculated luminance frequencies. By interpolating the binarization threshold values in units of blocks, the binarization threshold values in units of pixels are calculated, and the multi-valued image is binarized using the binarization threshold values in units of pixels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.