I try several test files and none of them work, I try test_structure_tensor.m and two other more and I could not make them work. Functions lack documentation within themself. I have to go to a help page to understant the input and outbuts of the functions. I also have the same error that Walid report and many others. If you have the time please correct them this is really a good effort that is not visible since there are some small errors.