Title:
BINARIZING METHOD FOR OPTICAL CHARACTER RECOGNITION SYSTEM
Document Type and Number:
Japanese Patent JP3251918
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To estimate a relative threshold corresponding to an intensity difference between a text and a background in an OCR system.
SOLUTION: A text pixel is determined in accordance with a result that differences between the value of a pixel 10 and the values of plural pixels separated from the pixel 10 by a prescribed distance are larger than a relative threshold corresponding to an intensity difference between a text and a background or not, an image is subsamplied at a rate corresponding to two pixels for detecting the kernel of the text and an image pixel is binarized only on a tile having the sideface of plural stroke widths and including the kernel of the text by using the estimated threshold. In the determination of a text pixel, which difference out of differences between two pixels located on positions where a circle 12 having a radius equal to stroke width W around a pixel to be analyzed intersects with a row line, a column line and two lines having an 45° angle and the value of the pixel to be analyzed is larger than the relative threshold is examined.
Inventors:
Andre Hailper
Jakov Navon
Eugene Warach
Jakov Navon
Eugene Warach
Application Number:
JP12965499A
Publication Date:
January 28, 2002
Filing Date:
May 11, 1999
Export Citation:
Assignee:
INTERNATIONAL BUSINESS MASCHINES CORPORATION
International Classes:
G06V30/162; G06V30/10; (IPC1-7): G06K9/38
Domestic Patent References:
| JP2277186A | ||||
| JP62267887A | ||||
| JP62152093A | ||||
| JP8172532A | ||||
| JP4362791A | ||||
| JP63501323A |
Other References:
【文献】米国特許5568571(US,A)
Attorney, Agent or Firm:
Hiroshi Sakaguchi (1 person outside)
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