Image processing apparatus and method setting thresholds of dither patterns based on density range and generating binary data depending on thresholds of target pixels
US9087291B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2014 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Sep 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2215/101
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image processing apparatus includes a generation unit; wherein a first dither pattern and a second dither pattern have same threshold values that are set for same pixels in a first gradation range, and have different threshold values that are set for same pixels in a second gradation range that exceeds the first gradation range; and the generation unit sets a first threshold value for forming dots of the first dither pattern, and generates a first binary data according to whether or not a threshold value corresponding to a target pixel of the first dither pattern is included in the first threshold value, and sets a second threshold value for forming dots of the second dither pattern, and generates a second binary data according to whether or not a threshold value corresponding to a target pixel of the second dither pattern is included in the second threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.