Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-09-14
1991-03-05
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358466, 382 50, H04N 140
Patent
active
049981226
ABSTRACT:
A feature-analyzing section determines whether a given picture element included in image information supplied from a line buffer represents a character portion or a photograph portion. In accordance with the determination made by the feature-analyzing section, a threshold value selection section selects either a threshold value calculated by a first threshold value calculation section, and to be used in relation to charcter portion, or a threshold value calculated by a second threshold value calculation section, and to be used in relation to photograph portion. By using the threshold value selected by the threshold value selection section, a binary-encoding section binary-encodes image information which is supplied thereto through a delay circuit. On the basis of the determination made by the feature-analyzing section, a determination section determines whether or not the given picture element represents a bold character portion. If the determination section determines that the given picture element represents a bold character portion, a selection section then selects a predetermined value supplied from a value generation section, in place of an output of the binary-encoding section.
REFERENCES:
patent: 4547811 (1985-10-01), Ochi et al.
patent: 4553172 (1985-11-01), Yamada et al.
patent: 4668995 (1987-05-01), Chen et al.
patent: 4914524 (1990-04-01), Kimura
patent: 4953012 (1990-08-01), Abe
Kanno Hiroki
Machida Hironobu
Yoneda Hitoshi
Coles Sr. Edward L.
Kabushiki Kaisha Toshiba
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