Image analysis – Image transformation or preprocessing – Measuring image properties
Reexamination Certificate
2008-04-03
2011-11-22
Couso, Yon (Department: 2624)
Image analysis
Image transformation or preprocessing
Measuring image properties
Reexamination Certificate
active
08064729
ABSTRACT:
Methods and apparatus for detecting skew in a document image, such as a check image, to produce a de-skewed image are described. One example method includes detecting one or more lines in the image and determining whether the one or more lines are reliable. Reliability of a line may be based on at least one of line length, straightness, and the presence of holes in the line. If one or more lines are reliable, the method may calculate a skew angle of the image based on the one or more reliable lines' orientations with respect to an orientation of the image. A comparison may also be made between lines detected in different regions of the check to determine if a difference between skew angles corresponding to each of the compared lines is lower than an error threshold.
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Li Jia
Zhou Hui
Couso Yon
Seiko Epson Corporation
Watson Mark P.
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