文档图像二值化 [英] document image binarization

问题描述

我正在尝试为文档图像找到有效的二值化技术。我目前已经实现了niblack和sauvola阈值算法，并尝试了基于直方图评估的二值化。有人可以建议其他已证明有效的二值化方法吗？
这是我一直在使用的降级图像示例：

I'm trying to find effective binarization techniques for document images. I've currently implemented the niblack and sauvola thresholding algorithms and tried binarization based on histogram evaluation as well. Could someone please suggest other binarization methods that have proved to be effective? Here's a sample degraded image I've been working with:

http://spie.org/Images/Graphics/Newsroom/Imported/0681/0681_fig1.jpg

任何建议将不胜感激。

推荐答案

如何从简单地根据当地社区调整阈值开始？

How about starting with simply adapting the threshold based on the local neighborhood?

im = rgb2gray(im);
im = im2double(im);
f_makebw = @(I) im2bw(I.data, double(median(I.data(:)))/1.45);
bw = ~blockproc(im, [128 128], f_makebw);

结果：

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