Non-maximum suppression

Non-maximum is one of the stages in Canny edge detection.

I collected some theory/implementation as below.


http://en.wikipedia.org/wiki/Canny_edge_detector
http://140.115.11.235/~chen/course/vision/ch6/ch6.htm <--canny.cpp
http://ccy.dd.ncu.edu.tw/~chen/course/vision/ch6/單元六、邊緣偵測.pdf
http://ccy.dd.ncu.edu.tw/~chen/course/vision/index.htm
http://www.tomgibara.com/computer-vision/canny-edge-detector <--CannyEdgeDetector.java
http://www.cvmt.dk/education/teaching/f09/VGIS8/AIP/canny_09gr820.pdf
http://www.nada.kth.se/cvap/abstracts/cvap191.html <--cvap191.pdf
http://code.google.com/p/in-spirit/wiki/CannyEdgeDetector <--CannyEdgeDetector.as, canny.c
http://users.ecs.soton.ac.uk/msn/book/new_demo/nonmax/ <--nonmax.java
http://140.118.107.213/personal/master96/joseph/ <--Canny Edge Based Image Expansion.pdf, Canny edge.ppt
http://ssip2003.info.uvt.ro/lectures/chetverikov/edge_detection.pdf <--edge_detection.pdf
[OpenCV source]/modules/imgproc/src/canny.cpp <--canny.cpp

compare non-maximum suppression in canny.cpp, CannyEdgeDetector.java, nonmax.java, maxsupr.m, canny.cpp