A proposed method for document image binarization based on bit plane slicing

M. Karthika, A. James
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引用次数: 6

Abstract

Document image binarization has not been an easy task in the area of historical document restoration accounting to the difficulty in choosing a threshold value when the document has noises due to say, its degradation, ageing of the paper, other unwanted impurities, background images, bleed-through, and so on. Also, in case of handwritten documents there could be inconsistency in the darkness of the letters. Though many algorithms have been proposed for Document image binarization, there has not been an effective algorithm which can efficiently binarize all kinds of documents. In this paper we propose a method to perform document image binarization using bit-plane slicing. The proposed method is deployed based on the rule of divide-and-conquer. As per this technique, the 8 bit planes of the gray image are extracted and processed separately, at the end of which, the results are combined to give the final binarized output.
提出了一种基于位平面切片的文档图像二值化方法
在历史文档恢复领域,文档图像二值化一直不是一项容易的任务,因为当文档存在噪声时,难以选择阈值,这些噪声来自于文档的退化、纸张的老化、其他不需要的杂质、背景图像、漏光等。此外,在手写文件的情况下,字母的黑暗可能会出现不一致。尽管人们提出了许多文档图像二值化算法,但目前还没有一种有效的算法能够对各类文档进行高效二值化。本文提出了一种使用位平面切片进行文档图像二值化的方法。该方法基于分治策略进行部署。根据该技术,对灰度图像的8位平面分别进行提取和处理,最后将结果组合在一起,得到最终的二值化输出。
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