I just released a free tool to binarize images. It uses the four popular binarization algorithms such as Otsu, Niblack, Sauvola, Kittler. It might come in handy if you need a quick way to threshold or binarize an image. I will soon make open source the main algorithms and add more algorithms. You can find the site application at:
http://binarizationsoftware.info
Let me know what you think.
Oliver
