IEEE Trans Image Process - Goal-oriented rectification of camera-based document images.

Tópicos

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Resumo

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.

Resumo Limpo

document digit either flatb scanner camerabas system result document imag often suffer warp perspect distort deterior perform current ocr approach paper present goalori rectif methodolog compens undesir document imag distort aim improv ocr result approach reli upon coarsetofin strategi first coars rectif accomplish aid comput low cost transform address project curv surfac d rectangular area project curv surfac plane guid textual content appear document imag incorpor transform depend specif model primit camera setup paramet second pose normal appli word level aim restor local distort document imag experiment result various document imag varieti distort demonstr robust effect propos rectif methodolog use consist evalu methodolog encount ocr accuraci newli introduc measur use semiautomat procedur

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