shape recognition(many shape): T=sobel(I) - File Exchange

Code covered by the BSD License

from shape recognition(many shape) by Trieu Nguyen Ta
with this you can recognize many shape;but only symetrical shape

T=sobel(I)
function T=sobel(I) H1=[1 1 1;0 0 0;-1 -1 -1] H2=[1 0 -1;1 0 -1;1 0 -1] B=rgb2gray(I) A=im2bw(B) T=nhanchap1(A,H1) S=nhanchap1(A,H2) H=(T.^2+S.^2).^0.5 imshow(H)