Page segmentation with tilt compensation

Details Page segmentation with tilt compensation Page segmentation with tilt compensation

1991-09-27

1994-02-08

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 46, 358462, G06K 934

Patent

active

052855040

ABSTRACT:
A method and an apparatus which scans and recognizes a page having columns of text or pictorial images. The scanned page is partitioned into blocks of scanlines and the column gap between the columns are identified by a projection profile process. With this technique the page can be severely tilted while under scan and still be properly recognized.

REFERENCES:
patent: 4503556 (1985-03-01), Scherl et al.
patent: 4558461 (1985-12-01), Schlang
patent: 4953230 (1990-08-01), Kurose
patent: 5001766 (1991-03-01), Baird
patent: 5172422 (1992-12-01), Tan
Henry S. Baird, Susan E. Jones and Steven J. Fortune, "Image Segmentation by Shape-Directed Covers", Proceedings 10th ICPR (Atlantic City, Jun. 1990), pp. 820-825.
Friedrich M. Wahl, Kwan Y. Wong, and Richard G. Casey, "Block Segmentation and Text Extraction in Mixed Text/Image Documents", vol. 20 Computer Graphics and Image Processing, pp. 375 to 390 (1982).
W. Scherl, F. Wasl and H. Fuchsberger, "Automatic Separation of Text, Graphic and Picture Segments in Printed Material", Pattern Recognition and Practice, pp. 212-221 (1980).
Emily G. Johnston "Printed Text Discrimination", Computer Graphics and Image Processing, vol. 3 (1974 pp. 83-89).

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