canny
http://python-gazo.blog.jp/algorithm/canny%E3%82%A8%E3%83%83%E3%82%B8%E6%A4%9C%E5%87%BA%E5%99%A8
http://mixi.jp/view_bbs.pl?comm_id=41490&id=1600799
ftp://publications.ai.mit.edu/ai-publications/pdf/AITR-720.pdf
http://www.motorwarp.com/koizumi/edgedetection.html
https://wakhok.repo.nii.ac.jp/index.php?action=pages_view_main&active_action=repository_action_common_download&item_id=154&item_no=1&attribute_id=22&file_no=2&page_id=13&block_id=17
http://aquioux.blog48.fc2.com/blog-entry-693.html
http://www.kochi-tech.ac.jp/library/ron/2009/2009info/1100311.pdf
http://navi.cs.kumamoto-u.ac.jp/~koutaki/pukiwiki/index.php?Canny%A5%D5%A5%A3%A5%EB%A5%BF%A3%B2
http://www.isl.titech.ac.jp/~nagahashilab/member/longb/iip/LectureNotes/feature_extract.pdf
http://d8yd.blog105.fc2.com/blog-entry-84.html
http://navi.cs.kumamoto-u.ac.jp/~koutaki/pukiwiki/index.php?Canny%A5%D5%A5%A3%A5%EB%A5%BF
http://vrstudio.azurewebsites.net/
http://www.vision.cs.chubu.ac.jp/flabresearcharchive/bachelor/B12/Abstract/hasegawa.pdf
http://rest-term.com/archives/2986/
http://www.iim.cs.tut.ac.jp/~kanatani/papers/harris.pdf
http://sakef.jp/blog/2011/01/canny01/
https://code.google.com/p/edge-detection/
http://www.wakayama-u.ac.jp/~wuhy/CV05.pdf
http://www.isl.titech.ac.jp/~nagahashilab/member/longb/clib/canny.cc
http://docs.opencv.org/doc/tutorials/imgproc/imgtrans/canny_detector/canny_detector.html
