Title:
UNDERLINE EXTRACTION METHOD
Document Type and Number:
Japanese Patent JP3147281
Kind Code:
B2
Abstract:
PURPOSE: To precisely extract an underline filled in a document picture even if an inclination and blurring exist or it is brought into contact with a character.
CONSTITUTION: A document is sampled and the values of respective pixels are quantized to the binary of '1' for black and '0' for white in a document input stage 1. In a pixel substitution stage 2, the black pixels are substituted for white pixels if more than one black pixels are included at every prescribed number of continuous pixels. In a vertical black run extension stage 3, the picture where the black pixels continue in a vertical direction is executed. In a horizontal black run extraction stage 4, a horizontal black run having more than prescribed length is extracted for the picture obtained in the vertical black run extraction stage 3. In a vertical black run degradation stage 5, a degradation processing is executed for the number of times similar to that of an extension processing executed in the vertical black run extension stage 3. In an underline candidate extraction stage 6, an underline candidate is extracted. In a lower contour extraction stage 7, the lower contour of the underline candidate is extracted. In an underline extraction stage 8, the lower contour is scanned from a left end and the underline is extracted.
Inventors:
Teruo Akiyama
Application Number:
JP1046995A
Publication Date:
March 19, 2001
Filing Date:
January 26, 1995
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G06K9/20; (IPC1-7): G06K9/20
Domestic Patent References:
| JP5378121A |
Attorney, Agent or Firm:
Katsuhiro Ito (1 outside)