Image coding apparatus capable of coding in accordance with an i

Details Image coding apparatus capable of coding in accordance with an i Image coding apparatus capable of coding in accordance with an i

1997-01-07

1998-04-21

Couso, Jose L.

Image analysis

Image segmentation

Distinguishing text from other regions

382170, 382171, 382232, 358453, 358462, 348438, G06K 934

Patent

active

057427046

ABSTRACT:
A one-block extracting section extracts a pixel block from an input image signal. An area judging section calculates characteristic quantities such as variance information, histogram information and dynamic range information, and judges whether the pixel block is photographic or text-like based on the characteristic quantities. A photographic pixel block is coded by a transform coding section, and a text-like pixel block is coded by a block truncation coding section.

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patent: 5138668 (1992-08-01), Abe
patent: 5150432 (1992-09-01), Ueono et al.
patent: 5267333 (1993-11-01), Aono et al.
patent: 5291309 (1994-03-01), Semasa

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