Method of detecting the skew angle of a printed business form

Details Method of detecting the skew angle of a printed business form Method of detecting the skew angle of a printed business form

1990-05-21

1991-10-01

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 9, 382 45, 382 44, G06K 932

Patent

active

050540980

ABSTRACT:
Document contour vectorization and the use of a modified Hough transform are used in combination to detect the skew angle of a digitized form image so that image skew may then be corrected in the preprocessing of form images prior to document analysis and classification.

REFERENCES:
patent: 4620288 (1986-10-01), Welmers
patent: 4689824 (1987-08-01), Mitchell et al.
patent: 4759075 (1988-07-01), Lipkie et al.
patent: 4759076 (1988-07-01), Tanaka et al.
patent: 4790025 (1988-12-01), Inoue et al.
patent: 4866784 (1989-09-01), Barski

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