Marked region recognition apparatus

Details Marked region recognition apparatus Marked region recognition apparatus

1990-01-22

1991-07-02

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 48, 358453, G06K 900

Patent

active

050292242

ABSTRACT:
A marked region recognition apparatus recognizes an arbitrary marked region of a document image from a mark signal which indicates whether or not there exists a mark which indicates the marked region. The marked region recognition apparatus comprises a first storing part for storing the mark signal for at least one scanning line, a second storing part for storing a coordinate in a main scanning direction where the marked region ends for each scanning line based on the mark signal stored in the first storing part, and a recognition part for recognizing an inside and an outside of the marked region and producing a marked region signal which indicates the inside or the outside of the marked region for a present scanning line responsive to a state of the marked region of a previous scanning line, which state is read out from the first and second storing parts.

REFERENCES:
patent: 4334274 (1982-01-01), Agui et al.
patent: 4538189 (1985-08-01), Saito et al.
patent: 4720750 (1988-01-01), Watanabe
patent: 4899227 (1990-02-01), Yamada
patent: 4908716 (1990-03-01), Sakano

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