@inproceedings{ICDAR-2009-Tanaka,
	author        = "Hiroshi Tanaka",
	booktitle     = "{Proceedings of the 10th International Conference on Document Analysis and Recognition}",
	doi           = "10.1109/ICDAR.2009.115",
	isbn          = "978-0-7695-3725-2",
	pages         = "541--545",
	publisher     = "{IEEE Computer Society}",
	title         = "{Threshold Correction of Document Image Binarization for Ruled-line Extraction}",
	year          = 2009,
}