THINING ALGORITHM USED IN IMAGE

*I attaching a zip file in which MATLAB code is there for thinning and images are also there my ques is that when am using this code on which images are in zip file its working but when I am applying this code on some other images then its not working can anyone help me out thnx*

code is not working for above image

[praveen rai]

@image analyst can u help me out in this code??