Detecting skew angle in a scanned image

Details Detecting skew angle in a scanned image Detecting skew angle in a scanned image

2007-04-03

2007-04-03

Couso, Yon J. (Department: 2624)

Image analysis

Image transformation or preprocessing

Measuring image properties

C382S291000, C358S488000

Reexamination Certificate

active

10943310

ABSTRACT:
Detecting skew and determining skew angle using the front of a document by determining background-to-document transitions. Incoming scanlines are interval sampled in the fast scan direction every nth pixel. The samples are collected and organized into a two dimension array comprised of scanline based rows and interval based columns. The collected and organized samples are analyzed by intervals to determine a scanline (row) where a specified sampling condition exceeds predetermined threshold. The corresponding row-interval point forms a background-to-medium transition point of the edge of a document. When two or more background-to-medium transition points are found from different intervals the skew angle can be determined using linear regression.

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