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 +

Funded by: Fundamental Research Funds for the Central Universities

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.

Citation Download Citation

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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