Textual image coding
US7903873B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2007 |
| Grant date | Mar 8, 2011 |
| Priority date | — |
| Expiry date | Jan 5, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Textual image coding involves coding textual portions of an image. In an example embodiment, a textual block of an image is decomposed into multiple base colors and an index map, with the index map having index values that each reference a base color so as to represent the textual block. A set of neighbor index values are ascertained for a particular index of the index map. A context that matches the neighbor index values is generated from among multiple contexts. The matching context includes a set of symbols. At least one symbol-to-value mapping is determined based on the matching context and a symbol to which the particular index corresponds. The particular index is remapped to a particular value in accordance with the symbol-to-value mapping and the symbol to which the particular index corresponds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.