Japanese / English

Detail of Publication

Text Language Japanese
Authors Ryo Niwa, Masakazu Iwamura, Koichi Kise, Seiichi Uchida, Shinichiro Omachi
Title Rectifying Perspective Distortion into Affine Distortion Using Variants and Invariants
Journal Proceedings of MIRU 2007
Presentation number IS-2-03
Pages pp.720-725
Reviewed or not Not reviewed
Month & Year July 2007
Abstract For user convenience, document image processing (DIP) captured with a digital camera instead of a scanner has been researched. However, existing methods of DIP are not usable for a perspective document image captured by a digital camera since most of them are designed for the one captured by a scanner. Thus, we have to rectify the perspective of the document image and obtain the frontal image as if it was captured by a scanner. In this paper, we propose a new rectification method of a document image introducing variants which change according to the gradient of the paper and invariants which do not change against it. Since the proposed method does not use strong assumptions, it is widely applicable to many document images unlike other methods. We confirmed the proposed method rectifies a document image suffering from perspective distortion and acquires the one with Affine distortion.
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