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Restoration of Arbitrarily Warped Historical Document Images Using Flow Lines

<17>The first paper to describe a method to identify and correct arbitrary warping in scanned historical documents. Unlike previous approaches, this widely applicable method is not limited by the need to use a model for specific geometrical distortions e.g. page curl. This is vital for large-scale digitization. Another important point for large-scale applications with mixed document conditions is that the proposed method does not introduce distortions in clean images, unlike most existing methods. Finally, a practical measure is introduced to reliably evaluate the performance of this and other systems (previously only indirect measures e.g. OCR performance, have been used).