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Removal of border noise, show through and shadow correction in irregularly illuminated scanned document images

机译:在不规则照明的扫描文档图像中删除边界噪音,显示通过和阴影校正

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Today most of the libraries maintain a digitized version of their document. During the process of scanning the pages of an open book, often problems such as dark borders, show through and shadow are frequently encountered. The shadow is a result of less illumination near the sides of the pages and it degrades the visibility of text near the side. Also any dark areas in the borders mar the appeal of the document. People have carried out various works on removal of such noises in the past. In this paper we have described an effective method based on thresholding to remove show through, combination of horizontal and vertical projection profile and pixel scanning for detection and removal of shadow and dark borders from scanned document images without affecting the useful information contained in the document. The technique was tested on various scanned images and to assess the performance of the method various metrics were calculated and tabulated.
机译:今天大多数图书馆都维护了他们的文件的数字化版本。在扫描开放书的页面过程中,经常遇到诸如暗边框,通过和阴影等问题。阴影是页面侧面附近的照明较少,并且降低了侧面附近文本的可见性。土壤中的任何黑暗地区也是文件的上诉。人们在过去的删除这些噪音方面进行了各种作品。在本文中,我们已经描述了一种基于阈值的有效方法,以通过,水平和垂直投影曲线的组合和用于检测和移除来自扫描的文档图像的阴影和暗边框的像素扫描的有效方法,而不影响文档中包含的有用信息。该技术在各种扫描的图像上进行了测试,并评估计算和制表各种度量的方法的性能。

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