一种比较好用的边缘检测方法CORNER Find corners in tensity image.

％ CORNER works by the following step:

％ 1.　　Apply the Canny edge detector to the gray level image and obtain a

％ binary edge-map.

％ 2.　　Extract the edge contours from the edge-map, fill the gaps in the

％ contours.

％ 3.　　Compute curvature at a low scale for each contour to retain all

％ true corners.

％ 4.　　All of the curvature local maxima are considered as corner

％ candidates, then rounded corners and false corners due to boundary

％ noise and details were eliminated.

％ 5. End points of line mode curve were added as corner, if they are not

％ close to the above detected corners.