@article{Tanaka1989,
	title = {Edge detection and restoration of noisy images by the expectation-maximization
	algorithm},
	author = {Masahiro Tanaka and Tohru Katayama},
	journal = {Signal Processing},
	month = {Jul},
	number = {3},
	pages = {213--226},
	url = {http://www.sciencedirect.com/science/article/B6V18-48V270Y-N0/1/0ca732489da7718b630a20970793a36a},
	volume = {17},
	year = {1989},
	biburl = {http://www.bibsonomy.org/bibtex/2ea90bc7bf0693ebdd67fb7fbb094747f/smicha},
	keywords = {Edge detection }
}