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...http://www.google.de/patents/US7903873?utm_source=gb-gplus-sharePatent US7903873 - Textual image coding
