Binarization method based on evolution equation for document images produced by cameras

Yan Wang; Chuangjiang He

doi:10.1117/1.JEI.21.2.023030

3 July 2012 Binarization method based on evolution equation for document images produced by cameras

Yan Wang, Chuangjiang He

Author Affiliations +

Journal of Electronic Imaging, Vol. 21, Issue 2, 023030 (July 2012). https://doi.org/10.1117/1.JEI.21.2.023030

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.

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Yan Wang and Chuangjiang He "Binarization method based on evolution equation for document images produced by cameras," Journal of Electronic Imaging 21(2), 023030 (3 July 2012). https://doi.org/10.1117/1.JEI.21.2.023030

Published: 3 July 2012

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