Color Reduction for Complex Document Images
Color Reduction for Complex Document Images
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DOI：
10.1002/ima.20174
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发表时间：
2009-01-01
影响因子：
3.3
通讯作者：
Papamarkos, Nikos
中科院分区：
文献类型：
--
作者：
Nikolaou, Nikos;Papamarkos, Nikos
提出了一种新的复杂文档图像色彩还原技术。它显著减少了文档图像的颜色数量(大多数情况下少于15种颜色)，从而具有纯色字符和统一的局部背景。因此，该技术可以作为文本信息提取应用程序的预处理步骤。具体地，使用文档图像的边缘图，选择构建3D颜色直方图的代表性样本集。基于3D颜色空间中的这些样本，通过使用简单的聚类过程获得相对大量的颜色(通常不超过100种颜色)。最终的颜色是通过应用基于均值漂移的过程来获得的。此外，还使用边缘保持平滑滤波作为预处理阶段，显著提高了初始图像的质量。实验结果证明，该方法能够生成正确分割的复杂彩色文档，其中字符元素可以很容易地提取为连通分量。(C)2009年威利期刊公司INT J成像系统技术，2009年19月14日至26日；在线发表在威利国际科学杂志(www.intercience.wiley.com)上。DOI 10.1002/ima.20174
A new technique for color reduction of complex document images is presented in this article. It reduces significantly the number of colors of the document image (less than 15 colors in most of the cases) so as to have solid characters and uniform local backgrounds. Therefore, this technique can be used as a preprocessing step by text information extraction applications. Specifically, using the edge map of the document image, a representative set of samples is chosen that constructs a 3D color histogram. Based on these samples in the 3D color space, a relatively large number of colors (usually no more than 100 colors) are obtained by using a simple clustering procedure. The final colors are obtained by applying a mean-shift based procedure. Also, an edge preserving smoothing filter is used as a preprocessing stage that enhances significantly the quality of the initial image. Experimental results prove the method's capability of producing correctly segmented complex color documents where the character elements can be easily extracted as connected components. (C) 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 14-26, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ima.20174