Digitization of Deformed Documents Using a High-Speed Multi-camera Array
Digitization of documents recently has become an important technology. However, it is difficult for existing scanners to read books at high speed and at high resolution simultaneously. In order to realize a promising new book scanning system, we aimed to scan a book containing many pages by using multiple high-speed cameras to acquire images while continuously flipping through the pages, then integrating the images viewed by different cameras to digitize all of the pages. However, high-accuracy integration with the non-uniform rectification required for such input images is a challenging task because the sheets of the document are deformed and the image resolution is so high that misalignment can easily occur. This paper proposes a new multi-camera-array book scanning system and a method of achieving high-accuracy three-dimensional deformation estimation and high-resolution rectification of the distorted document images with a system configuration in which multiple high-speed cameras are arranged with small overlapping captured areas. Experiments using the developed system showed that high-accuracy document images were reconstructed.
KeywordsDocument Image Developable Surface Stereo Match Surface Estimation Bezier Curve
Unable to display preview. Download preview PDF.
- 1.Nakashima, T., Watanabe, Y., Komuro, T., Ishikawa, M.: Book flipping scanning. In: Adjunct Proceedings of UIST, pp. 79–80 (2009)Google Scholar
- 2.Watanabe, Y., Nakashima, T., Komuro, T., Ishikawa, M.: Estimation of non-rigid surface deformation using developable surface model. In: Proceedings of ICPR, pp. 197–200 (2010)Google Scholar
- 3.Cao, H., Ding, X., Liu, C.: Rectifying the bound document image captured by the camera: A model based approach. In: Proceedings of ICDAR, pp. 71–75 (2003)Google Scholar
- 6.Tian, Y., Narasimhan, S.G.: Rectification and 3D Reconstruction of Curved Document Images. In: Proceedings of ICCV, pp. 377–384 (2011)Google Scholar
- 7.Yamashita, A., Kawarago, A., Kaneko, T., Miura, K.T.: Shape reconstruction and image restoration for non-flat surfaces of documents with a stereo vision system. In: Proceedings of ICPR, pp. 482–485 (2004)Google Scholar
- 9.Brown, M.S., Pisula, C.J.: Conformal deskewing of non-planar documents. In: Proceedings of CVPR, pp. 998–1004 (2005)Google Scholar
- 12.Ng, R., Levoy, M., Bredif, M., Duval, G., Horowitz, M., Hanrahan, P., Design, D.: Light field photography with a hand-held plenoptic camera. Stanford Tech. Report CTSR 2005-02 (2005)Google Scholar
- 15.Lowe, D.G.: Object recognition from local scale-invariant features. In: Proceedings of the International Conference on Computer Vision, pp. 1150–1157 (2007)Google Scholar
- 16.Carmo, M.P.D.: Differential Geometry of Curves and Surfaces. Prentice Hall (1976)Google Scholar
- 17.Liang, J., DeMenthon, D., Doermann, D.: Unwarping Images of Curved Documents Using Global Shape Optimization. In: Proceedings of CBDAR, pp. 25–29 (2005)Google Scholar