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Journal of Electronic Imaging

Binarization method based on evolution equation for document images produced by cameras
Author(s): Yan Wang; Chuangjiang He
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Paper Abstract

We present an evolution equation-based binarization method for document images produced by cameras. Unlike the existing thresholding techniques, the idea behind our method is that a family of gradually binarized images is obtained by the solution of an evolution partial differential equation, starting with an original image. In our formulation, the evolution is controlled by a global force and a local force, both of which have opposite sign inside and outside the object of interests in the original image. A simple finite difference scheme with a significantly larger time step is used to solve the evolution equation numerically; the desired binarization is typically obtained after only one or two iterations. Experimental results on 122 camera document images show that our method yields good visual quality and OCR performance.

Paper Details

Date Published: 3 July 2012
PDF: 15 pages
J. Electron. Imag. 21(2) 023030 doi: 10.1117/1.JEI.21.2.023030
Published in: Journal of Electronic Imaging Volume 21, Issue 2
Show Author Affiliations
Yan Wang, Chongqing Univ. (China)
Chuangjiang He, Chongqing Univ. (China)

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