Sequential Correction of Perspective Warp in Camera-based Documents

Authors:
Camille Monnier;Steve Holden;Magnus Snorrason;Vitaly Ablavsky
Affiliations:
Charles River Analytics Inc., MA;Charles River Analytics Inc., MA;Charles River Analytics Inc., MA;Boston University
Venue:
ICDAR '05 Proceedings of the Eighth International Conference on Document Analysis and Recognition
Year:
2005

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Abstract

Documents captured with hand-held devices, such as digital cameras often exhibit perspective warp artifacts. These artifacts pose problems for OCR systems which at best can only handle in-plane rotation. We propose a method for recovering the planar appearance of an input document image by examining the vertical rate of change in scale of features in the document. Our method makes fewer assumptions about the document structure than do previously published algorithms.