OcrV1, Main, Exploration, bibRecord, 000562

Goal-Oriented Rectification of Camera-Based Document Images

Identifieur interne : 000562 ( Main/Exploration ); précédent : 000561; suivant : 000563

Goal-Oriented Rectification of Camera-Based Document Images

Auteurs : Nikolaos Stamatopoulos [Grèce] ; Basilis Gatos [Grèce] ; Ioannis Pratikakis [Grèce] ; Stavros J. Perantonis [Grèce]

Source :

IEEE transactions on image processing [ 1057-7149 ] ; 2011.

RBID : Pascal:11-0188625

Descripteurs français

Pascal (Inist)
- Traitement image document, Numérisation, Gauchissement, Dégradation, Evaluation performance, Reconnaissance optique caractère, Distorsion signal, Qualité image, Diminution coût, Surface courbe, Robustesse, Précision, Méthode semi-automatique, Analyse image, Reconnaissance forme.
Wicri :
- topic : Numérisation.

English descriptors

KwdEn :
- Accuracy, Cost lowering, Curved surface, Degradation, Digitizing, Document image processing, Image analysis, Image quality, Optical character recognition, Pattern recognition, Performance evaluation, Robustness, Semiautomatic method, Signal distortion, Warping.

Abstract

Document digitization with either flatbed scanners or camera-based systems results in document images which often suffer from warping and perspective distortions that deteriorate the performance of current OCR approaches. In this paper, we present a goal-oriented rectification methodology to compensate for undesirable document image distortions aiming to improve the OCR result. Our approach relies upon a coarse-to-fine strategy. First, a coarse rectification is accomplished with the aid of a computationally low cost transformation which addresses the projection of a curved surface to a 2-D rectangular area. The projection of the curved surface on the plane is guided only by the textual content's appearance in the document image while incorporating a transformation which does not depend on specific model primitives or camera setup parameters. Second, pose normalization is applied on the word level aiming to restore all the local distortions of the document image. Experimental results on various document images with a variety of distortions demonstrate the robustness and effectiveness of the proposed rectification methodology using a consistent evaluation methodology that encounters OCR accuracy and a newly introduced measure using a semi-automatic procedure.

Affiliations:

Grèce

Links toward previous steps (curation, corpus...)

to stream PascalFrancis, to step Corpus: 000148
to stream PascalFrancis, to step Curation: 000625
to stream PascalFrancis, to step Checkpoint: 000116
to stream Main, to step Merge: 000568
to stream Main, to step Curation: 000562

Le document en format XML

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Goal-Oriented Rectification of Camera-Based Document Images

Goal-Oriented Rectification of Camera-Based Document Images

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri