Textual image coding

Details Textual image coding Textual image coding

2011-03-08

2011-03-08

Do, Anh Hong (Department: 2624)

Image analysis

Color image processing

Compression of color images

C382S232000, C382S238000

Reexamination Certificate

active

07903873

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.

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