Rectifying Perspective Distortion into Affine Distortion Using Variants and Invariants
| Language | Japanese |
|---|---|
| Type | Proceedings of Japanese Conferences |
| 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 | Not reviewed |
| Date | July 2007 |
| Research fields | Document Image Analysis |
| Key | Niwa2007_MIRU (id=983) |
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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