Some progress in existing data

   After doing some review in parts of the homeworks in cse 252, I'm getting more familiar with Matlab and pattern recognition experiments.So I'm trying to analyse the existing data, split each picture in even and odd columns to form two data set. These pairs of data may help me to determine whether  I'm going in the right direction in selecting the method to solve the problem.(But since the images are too large, I'm getting just 67% of the results)
wood:                                 denim:

foampad:                      foamgrip:

pictures of 4 types of material that are separated

Furthermore, I get some plots of the mean values of the separated images(by column). These values may help me get further features of each material.

wood:                                   denim:             

foamgrip:

mean values of 3 types of material 's columns

Next step, I'll try to distract features from original data and generated plots.