Metric Rectification of Curved Document Images

CASIA OpenIR > 多模态人工智能系统全国重点实验室 > 先进时空数据分析与学习

	Metric Rectification of Curved Document Images
	Meng, Gaofeng1 ; Pan, Chunhong1 ; Xiang, Shiming1 ; Duan, Jiangyong 1; Zheng, Nanning 2
发表期刊	IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE
	2012-04-01
卷号	34 期号:4 页码:707-722
文章类型	Article
摘要	In this paper, we propose a metric rectification method to restore an image from a single camera-captured document image. The core idea is to construct an isometric image mesh by exploiting the geometry of page surface and camera. Our method uses a general cylindrical surface (GCS) to model the curved page shape. Under a few proper assumptions, the printed horizontal text lines are shown to be line convergent symmetric. This property is then used to constrain the estimation of various model parameters under perspective projection. We also introduce a paraperspective projection to approximate the nonlinear perspective projection. A set of close-form formulas is thus derived for the estimate of GCS directrix and document aspect ratio. Our method provides a straightforward framework for image metric rectification. It is insensitive to camera positions, viewing angles, and the shapes of document pages. To evaluate the proposed method, we implemented comprehensive experiments on both synthetic and real-captured images. The results demonstrate the efficiency of our method. We also carried out a comparative experiment on the public CBDAR2007 data set. The experimental results show that our method outperforms the state-of-the-art methods in terms of OCR accuracy and rectification errors.
关键词	Document Image Analysis Imaging Geometry Geometric Correction Shape-from-x Mesh Warping
WOS标题词	Science & Technology ; Technology
关键词[WOS]	PERSPECTIVE IMAGES ; SHAPE ; RESTORATION
收录类别	SCI
语种	英语
WOS研究方向	Computer Science ; Engineering
WOS类目	Computer Science, Artificial Intelligence ; Engineering, Electrical & Electronic
WOS记录号	WOS:000300581700007
引用统计	被引频次：39[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ia.ac.cn/handle/173211/3713
专题	多模态人工智能系统全国重点实验室_先进时空数据分析与学习
作者单位	1.Chinese Acad Sci, Inst Automat, Natl Lab Pattern Recognit, Beijing 100190, Peoples R China 2.Xi An Jiao Tong Univ, Inst Artificial Intelligence & Robot, Xian 710049, Peoples R China
第一作者单位	模式识别国家重点实验室
推荐引用方式 GB/T 7714	Meng, Gaofeng,Pan, Chunhong,Xiang, Shiming,et al. Metric Rectification of Curved Document Images[J]. IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE,2012,34(4):707-722.
APA	Meng, Gaofeng,Pan, Chunhong,Xiang, Shiming,Duan, Jiangyong,&Zheng, Nanning.(2012).Metric Rectification of Curved Document Images.IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE,34(4),707-722.
MLA	Meng, Gaofeng,et al."Metric Rectification of Curved Document Images".IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE 34.4(2012):707-722.

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