@inproceedings{ICDAR-1997-SunS,
	author        = "Changming Sun and Deyi Si",
	booktitle     = "{Proceedings of the Fourth International Conference on Document Analysis and Recognition}",
	doi           = "10.1109/ICDAR.1997.619830",
	isbn          = "0-8186-7898-4",
	pages         = "142--146",
	publisher     = "{IEEE Computer Society}",
	title         = "{Skew and Slant Correction for Document Images Using Gradient Direction}",
	year          = 1997,
}