Tyre deformation

Dear,I am a student and for my final thesis I have to make a study on the deformation of the sidewall of tires, in order to consider the stability of agricultural vehicles under load. I have found on the Matlab web page the link to Your page, and I used the Digital Image Correlation and Tracking with Matlab. I download the necessary files and tried to analyze my photos with Matlab. 1 - The first problem I get is the fact that I am not able to make the analysis of the entire photo. Matlab says that the index matrix is exceeded, so I had to cut the images, in order to have smaller ones.2 – Once cut the photo the problem is that the >> displacement file gives the following error: ??? Index exceeds matrix dimensions. Error in ==> displacement at 24basedisplx=-mean((validx(:,1:3))')'; and this happens also if the points of the grid_generator are few. Which are the maximum dimensions for the images? Can you help me to go over these problems? I really need this help, I have to make this work in a few time…  The purpose of my work is to find the displacement of the points on the sidewall of the tyre, and so its deformation.  Please give me an hand! Thanks a lot Daniele