Method and apparatus for identification of document skew

Details Method and apparatus for identification of document skew Method and apparatus for identification of document skew

1992-10-19

1994-10-11

Moore, David K.

Image analysis

Histogram processing

For setting a threshold

382 18, 358488, 345126, G06K 932

Patent

active

053554205

ABSTRACT:
A method and apparatus for identifying and correcting for document skew. Lines of a bitmap are scanned and a variance in the number of ON pixels as a function of skew angle is calculated. Skew of the original document occurs when the variance is a maximum.

REFERENCES:
patent: 454339 (1989-12-01), Spitz
patent: 3831146 (1974-08-01), Rundle
patent: 4052699 (1977-10-01), Micka et al.
patent: 4338588 (1982-07-01), Chevillat et al.
patent: 4414685 (1983-11-01), Sternberg
patent: 4499499 (1985-02-01), Brickman et al.
patent: 4533959 (1985-08-01), Sakurai
patent: 4558461 (1985-12-01), Schlang
patent: 4633507 (1986-12-01), Cannistra et al.
patent: 4700400 (1987-10-01), Ross
patent: 4723297 (1988-02-01), Postl
patent: 4742558 (1988-05-01), Ishibashi et al.
patent: 4747150 (1988-05-01), Knutsson et al.
patent: 4747151 (1988-05-01), Knutsson et al.
patent: 4747152 (1988-05-01), Knutsson et al.
patent: 4748676 (1988-05-01), Miyagawa et al.
patent: 4759075 (1988-07-01), Lipkie et al.
patent: 4759076 (1988-07-01), Tanaka et al.
patent: 4783826 (1988-11-01), Koso
patent: 4783828 (1988-11-01), Sadjadi
patent: 4786976 (1988-11-01), Takao et al.
patent: 4791679 (1988-12-01), Barski et al.
patent: 4805031 (1989-02-01), Powell
patent: 4809344 (1989-02-01), Peppers et al.
patent: 4817186 (1989-03-01), Goolsbey et al.
patent: 4821333 (1989-04-01), Gillies
patent: 4827330 (1989-05-01), Walsh et al.
patent: 4858018 (1989-08-01), Tanaka
patent: 4876730 (1989-10-01), Britt
patent: 4912559 (1990-03-01), Ariyoshi et al.
patent: 4926490 (1990-05-01), Mano
patent: 4941189 (1990-07-01), Britt
patent: 4953230 (1990-08-01), Kurose
patent: 5001766 (1991-03-01), Baird
patent: 5187753 (1993-02-01), Bloomberg et al.
R. Hunter "International Digital Facsimile Coding Standards", Proceedings of the IEEE, vol. 68, No. 7, Jul. 1980, pp. 854-867.
K. Y. Wong, et al., "Document Analysis System", IBM J. Res. Develop. vol. 6, No. 6, Nov. 1982, pp. 647-656.
S. R. Sternberg, "Biomedical Image Processing", IEEE (1983), pp. 22-34.
W. Postl "Detection of Linear Oblique Structures and Skew Scan In Digitized Documents", IEEE Computer Society Order Number 742, Library of Congress Number 86-81419, IEEE Computer Society Press, Order Number 742, pp. 687-689.
H. S. Baird "The Skew Angle of Printed Documents", Symposium in Hybrid Imaging Systems, May 20-21, 1987, Rochester, N.Y. pp. 21-24.
P. Maragos "Tutorial on advances in morphological image processing and analysis", Optical Engineering/Jul. 1987/vol. 26 No. 7/pp. 623-632.
R. M. Haralick, et al. "Image analysis Using Mathematical Morphology", IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-9 No. 4, Jul. 1987 pp. 532-550.

Affiliated with

Also associated with

Rating

Method and apparatus for identification of document skew does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for identification of document skew, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for identification of document skew will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1664865