Image analysis – Image compression or coding – Including details of decompression
Patent
1996-03-15
2000-11-28
Au, Amelia
Image analysis
Image compression or coding
Including details of decompression
358433, G06K 936
Patent
active
061545694
ABSTRACT:
A coding and/or decoding system for an image including bit-sops of different levels, is provided in an image recoding system which recodes bit-map data including small-level bit-map data and multilevel bit-map data in an image memory and which read the bit-map data out of the image memory to recode an image. In this coding and/or decoding system, after small-level bit-map data and multilevel bit-map data are divided into blocks, each of which is composed of a plurality of picture elements, the divided small-level bit-map data and the divided multilevel bit-map data are inputted to small-level bit-map data coding section and multilevel bit-map data coding section, respectively. The small-level bit-map data are transformed into codes representative of the number of black or white and half-tone picture elements in the block, and the multilevel bit-map data are transformed into codes representative of the average value or the total in the block. These data are assigned to different codes of digital data written in the image memory, respectively, so as to provide an image recoding system which can effectively reduce the capacity of a page memory for storing an image information and which can recode an image including small-level and multilevel.
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Sakaue Eiichi
Sekizawa Hidekazu
Tabata Sunao
Yamamoto Naofumi
Ahmed Samir
Au Amelia
Kabushiki Kaisha Toshiba
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