Coherence change detection

i m looking for change detection formula in this tutorial which i thing is
ratio = master coherence /slave coherence

please share the URL of this tutorial and also at which part you refer to, for example at which minute you struggle to follow.

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39 mn

the change detection formula?

thank you, now I understand. This has been answered here: Change detection. Which algorithm is implemented?

really helpful but as user of this technique; i can’t understand that the algorithm
i m asking if “”“ration = (master pixels values coherence) / (slave pixels values coherence )”"""

I just saw that the link to the document was no longer valid. You find it now here
Preiss, M., & Stacy, N. J. (2006). Coherent change detection: Theoretical description and experimental results (Chapter 4.2)

thanks sir @ABraun