a good referece matlab sourcecode for edge detection by Canny, which can extract the main edge and contour.

edge_extract\12789295864c3aeab261dc1.jpg
............\1653567.jpg
............\200192714331.jpg
............\23.jpg
............\23_01.jpg
............\5234_1263903935l811.jpg
............\aaa.jpg
............\building.jpg
............\cleanedgelist.m
............\cottage.jpg
............\drawedgelist.m
............\edgelink.m
............\edgelist2image.m
............\example.asv
............\example.m
............\findendsjunctions.m
............\IMG_0362.jpg
............\IMG_0395.jpg
............\lineseg.m
............\maxlinedev.m
............\monumento2_1024.jpg
............\s36_200942130473.jpg
............\shapessm.jpg
edge_extract

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