Method and apparatus for detection of a skew angle of a document

Details Method and apparatus for detection of a skew angle of a document Method and apparatus for detection of a skew angle of a document

1994-12-14

1996-10-08

Epps, Georgia Y.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

382289, 382290, 358488, H01J 4014

Patent

active

055634036

ABSTRACT:
A method and apparatus for detecting the skew angle of a document image. Skew angle determination is performed by the steps of determining a set of sampling points from an input document image and processing X and Y coordinates of the sampling points in order to calculate a regression coefficient of the sampling points. The skew angle of the document is determined using the regression coefficient. To evaluate a calculated skew angle which corresponds to the regression coefficient, a correlation coefficient is calculated and evaluated. As coordinates of sampling points are obtained for a plurality of sets of data corresponding to different ruled lines or lines of characters, a histogram may be used to determine the most probable skew angle.

REFERENCES:
patent: 4547864 (1985-10-01), Kawabata
patent: 4558461 (1985-12-01), Schlang
patent: 4941189 (1990-07-01), Britt
patent: 5046114 (1991-09-01), Zobel
patent: 5077811 (1991-12-01), Onda
patent: 5280544 (1994-01-01), Tanaka et al.
"Document Image Segmentation and Text Area Ordering", Takashi Saitoh, et al., IEEE Computer Society Press Reprint, Oct. 20-22, 1993, pp. 323-329.
"Fast and Accurate Skew Detection Algorithm for a Text Document or a Document with Straight Lines", Goroh Bessho, et al., SPIE vol. 2181 Document Recognition (1994), pp. 133-140.
"Fast Skew Correction of a Printed Document", Koichi Ejiri, Proceedings of the Institute of Image Electronic Engineers of Japan, Jun. 8, 1993.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-59314