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Effective Geometric Restoration of Distorted Historical Document for Large-Scale Digitization

机译:用于大规模数字化的失真历史文档的有效几何恢复

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摘要

Due to storage conditions and material’s non-planar shape, geometric distortion of the 2-D content is widely present in scanned document images. Effective geometric restoration of these distorted document images considerably increases character recognition rate in large-scale digitisation. For large-scale digitisation of historical books, geometric restoration solutions expect to be accurate, generic, robust, unsupervised and reversible. However, most methods in the literature concentrate on improving restoration accuracy for specific distortion effect, but not their applicability in large-scale digitisation. This paper proposes an effective mesh based geometric restoration system, (GRLSD), for large-scale distorted historical document digitisation. In this system, an automatic mesh generation based dewarping tool is proposed to geometrically model and correct arbitrary warping historical documents. An XML based mesh recorder is proposed to record the mesh of distortion information for reversible use. A graphic user interface toolkit is designed to visually display and manually manipulate the mesh for improving geometric restoration accuracy. Experimental results show that the proposed automatic dewarping approach efficiently corrects arbitrarily warped historical documents, with an improved performance over several state-of-the-art geometric restoration methods. By using XML mesh recorder and GUI toolkit, the GRLSD system greatly aids users to flexibly monitor and correct ambiguous points of mesh for the prevention of damaging historical document images without distortions in large-scale digitalisation.
机译:由于存储条件和材料的非平面形状,在扫描的文档图像中普遍存在2-D内容的几何变形。这些失真的文档图像的有效几何恢复大大提高了大规模数字化中的字符识别率。对于历史书籍的大规模数字化,几何复原解决方案期望是准确,通用,健壮,不受监督和可逆的。但是,文献中的大多数方法都集中在提高针对特定失真效果的恢复精度上,而不是在大规模数字化中的适用性。本文提出了一种有效的基于网格的几何恢复系统(GRLSD),用于大规模失真的历史文档数字化。在该系统中,提出了一种基于网格自动生成的变形工具,以对任意变形的历史文档进行几何建模和校正。提出了一种基于XML的网格记录器,用于记录变形信息的网格以供可逆使用。图形用户界面工具包旨在可视化显示和手动操作网格,以提高几何恢复精度。实验结果表明,所提出的自动变形方法可以有效地校正任意变形的历史文档,并且与几种最新的几何复原方法相比,其性能得到了改善。通过使用XML网格记录器和GUI工具包,GRLSD系统极大地帮助用户灵活地监视和校正网格的模糊点,以防止损坏历史文档图像而不会在大规模数字化中失真。

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