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Hi, here are a few methods that are related

opencv: cv::adaptiveThreshold, cv::threshold with OTSU method

opensource implementations: https://github.com/zp-j/binarizewolfjolion, https://github.com/rmtheis/bradley-adaptive-thresholding

other links to similar discussions: http://stackoverflow.com/questions/13391073/adaptive-threshold-of-blurry-image, http://stackoverflow.com/questions/13639336/threshold-of-blurry-image-part-2, http://stackoverflow.com/questions/20073257/suggestions-on-thresholding-techniques-image-binarization

Hope this helps