Classification of 2 polarisations radar images in two classes: the class that pixel has change et another class where pixel value has not change

Microwave Toolbox Polarimetry
1

I use two images that has two bands (VV and vh). The images has been taked at différents time… I want to compare the two images and detect the pixels where the value has change, and another where the value has not change. That is why i say that it is the classification in two classes.
Please help me.
What am i suppose to begin please?

2

I would do it as follows.
Make a stack of the VV bands (first and second acqusition).

Apply the SAR change detection module (based on log-likelihood classification of changes above a defined threshold)

Do the same for VH.