Determining pixels textual characteristics
US7616814B2 · kind B2 · utility
6Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2004 |
| Grant date | Nov 10, 2009 |
| Priority date | — |
| Expiry date | Feb 8, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V30/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Pixels are classified as text; or “non-text” by responding to accumulated luminous brightness gradients within a predetermined pixel interior. Text and non-text image characteristics rest on estimating text-containing rectangles by determining a narrow width and a height of a peak in an interval of accumulated gradients around each pixel. The text characteristics also are inferred by detecting character corners by quantifying and smoothing gradient angles and by associating directional corner responses with each pixel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.