Image processing apparatus and image processing method
US8422790B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2011 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Jun 30, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/161
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus includes a conversion unit that converts an input image into a plurality of frequency components; a first quantization threshold calculating unit that calculates a first quantization threshold corresponding to a first frequency component among the plurality of frequency components of the input image converted by the conversion unit, based on a statistic value of the first frequency component; a second quantization threshold calculating unit that calculates a second quantization threshold corresponding to a second frequency component other than the first frequency component among the plurality of frequency components, based on the first quantization threshold calculated by the first quantization threshold calculating unit; and a quantization unit that quantizes the first frequency component and the second frequency component by using the first quantization threshold and the second quantization threshold, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.