http://www.labbookpages.co.uk/software/imgProc/otsuThreshold.html
當然Wiki也要查一下
http://en.wikipedia.org/wiki/Otsu's_method
Gray轉Binary還有其他方法(details please check OCRopus)
transforms grayscale (and sometimes color) images into binary images.
- BinarizeByOtsu
- BinarizeByRange
- BinarizeBySauvola
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