Estimation of skew angle in text image

Details Estimation of skew angle in text image Estimation of skew angle in text image

1994-06-14

1996-12-10

Mancuso, Joseph

Image analysis

Image transformation or preprocessing

Measuring image properties

382296, G06K 936

Patent

active

055839568

ABSTRACT:
Disclosed is a fast and high resolution technique for estimating the skew angle in text document images. Detection of the skew angle is an important step in text processing tasks such as optical character reading (OCR) and computerized filing. The proposed method is based on the application of a recently developed algorithm for estimation of angle of straight lines in a scanned image. The Subspace-Based Line Detection (SLIDE) algorithm formulates the multi-line fitting problem in a special parameter estimation framework such that a signal structure similar to the one in the field of high-resolution sensor array processing is obtained. Then the well-studied techniques in that formalism (e.g., the ESPRIT algorithm) are exploited to produce closed-form and high resolution estimates for line parameters.

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