Method and apparatus for identifying the rotation angle and...

Details Method and apparatus for identifying the rotation angle and... Method and apparatus for identifying the rotation angle and...

2006-07-11

2010-10-19

Couso, Jose L (Department: 2624)

Image analysis

Histogram processing

Reexamination Certificate

active

07817854

ABSTRACT:
Methods and apparatus for determining the skew angle of a digitized form scanned at an angle to the original page are described. The method determines a rotation angle and a boundary rectangle of best fit. Sections of the digital image in the form of thin strips are examined for the boundary between the page and the region of the scanned image beyond the original page. The Hough transform is employed to determined candidate edge line segments for the page from the sets of perimeter points. These line segments are then combined to select the best rectangle enclosing the page, from which the skew angle is determined. The algorithm also determines a rotated bounding box enclosing the page. An innovation of the invention is the use of fuzzy logic, whereby several candidates for perimeter points, candidate edges, and bounding rectangles are determined in each step of the computation with associated confidence values and the final skew angle is selected by choosing the bounding rectangle with the highest confidence values.

REFERENCES:
patent: 7487438 (2009-02-01), Withers

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