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Title:
TEN THOUSAND LINES DISCRIMINATION DEVICE, IMAGE AREA SEPARATION DEVICE, IMAGE PROCESSING UNIT, IMAGE FORMATION DEVICE, PROGRAM AND STORAGE MEDIUM
Document Type and Number:
Japanese Patent JP2002300388
Kind Code:
A
Abstract:

To discriminate a part of image data which is configured of ten thousand lines.

A block consisting of 5×5 pixels around a target pixel in image data obtained by reading an original is considered. A columnar unit pixel value summing section 62 obtains sums P1-P5 by summing 5 pixels of each column of the block consisting of 5×5 pixels. A subtraction/comparator circuit 63 subtracts the sums P1-P5 with each other and compares the result with a reference value th1 to discriminate a rugged pattern of image density denoted by the sums P1-P5 and AND discrimination sections 65a, 65b AND the result so as to discriminate whether or not the pattern corresponds to a particular ten thousand lines pattern.


Inventors:
SAITO TAKASHI
Application Number:
JP2001000101282
Publication Date:
October 11, 2002
Filing Date:
March 30, 2001
Export Citation:
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Assignee:
RICOH KK
International Classes:
H04N1/40; G06T7/40; (IPC1-7): H04N1/40; G06T7/40
Attorney, Agent or Firm:
柏木 慎史 (外2名)