Method and system for document segmentation

Details Method and system for document segmentation Method and system for document segmentation

2005-06-07

2005-06-07

Tran, Phuoc (Department: 2621)

Image analysis

Image segmentation

Using projections

C382S176000, C382S179000, C382S281000

Reexamination Certificate

active

06904170

ABSTRACT:
A method of document segmentation. Specifically, one embodiment of the present invention discloses a method of document segmentation that performs a plurality of projection profiles of pixel intensities on a document containing a plurality of text lines over a range of angles. A plurality of slope values for a plurality of discrete distances perpendicular to said range of angles is calculated for the plurality of projection profiles. A set of maximum absolute slope values is sorted out from the plurality of slope values. Text lines of first and second type are identified by setting a threshold slope value. Absolute slope values greater than the threshold slope value indicate the plurality of text lines of said first type. Absolute slope values less than the threshold slope value indicate the plurality of text lines of a second type.

REFERENCES:
patent: 5517586 (1996-05-01), Knowlton
patent: 5570435 (1996-10-01), Bloomberg et al.
patent: 6108444 (2000-08-01), Syeda-Mahmood
patent: 6687421 (2004-02-01), Navon

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