Sequential Correction of Perspective Warp in Camera-based Documents

Monnier, C., Ablavsky, V., Holden, S., and Snorrason, M.

Proceedings of ICDAR 2005, Seoul, Korea (August, 2005)

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.

Binarized document image taken from an arbitrary perspective (left), partially rectified document image (middle), fully rectified image (right)

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