Open Access Open Access  Restricted Access Subscription or Fee Access

Document Scanning in a tough environment : application to cameraphones

Sahar Saoud, Zouhir Mahani, Abdelilah Hakim, Mohammed El Rhabi


The aim of this paper is to suggest a new method to enhance text in document-image. In the first step, we present a classical model based on non-convex optimization problem. In this way, a simultaneous estimation of the reflectance and the luminance are obtained when the non uniform illumination (also called luminance) is a smooth function and the reflectance is a function of bounded variation. We prove some conditions of existence and unicity. Secondly, we introduce the ”log” of the classical problem which generate a new PDE’s model. Resolution of this method is based on solving an original Partial Differential Equation (PDE) estimating the log of the luminance. We assume that the luminance is enough smooth and is the solution of a non classical second order’s PDE, and we deduce the reflectance from the estimated luminance and the acquired image. To illustrate the robustness of the proposed process (by means to prove the ability of this method to improve an Optical Character Recognition (OCR) in text recognition) we give a numerical examples in real-world situation (images acquired from cameraphones).


Text enhancement, Image processing, partial differential equations.

Full Text:



  • There are currently no refbacks.

Disclaimer/Regarding indexing issue:

We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information.