Title :
A cylindrical surface model to rectify the bound document image
Author :
Cao, Huaigu ; Ding, Xiaoqing ; Liu, Changsong
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
We propose a novel approach on how to rectify the photo image of the bound document. The surface of the document is modeled by a cylindrical surface. By the geometry of camera image formation, the equations using the cue of directrixes to map the points on the surface in the 3D scene to the points on the image plane are achieved. Baselines of the horizontal text line are extracted as projections of directrixes to estimate the bending extent of the surface, and then the images are rectified. The proposed method needs no auxiliary device. Experimental results are presented to demonstrate the feasibility and the application of the method.
Keywords :
computational geometry; document image processing; feature extraction; image scanners; optical character recognition; 3D scene; bound document image rectification; camera image formation geometry; cylindrical surface model; directrixes cue; horizontal text line extraction; image scanners; optical character recognition; Books; Digital cameras; Geometry; Glass; Intelligent systems; Laboratories; Optical character recognition software; Rough surfaces; Surface emitting lasers; Surface roughness;
Conference_Titel :
Computer Vision, 2003. Proceedings. Ninth IEEE International Conference on
Conference_Location :
Nice, France
Print_ISBN :
0-7695-1950-4
DOI :
10.1109/ICCV.2003.1238346