How coherence is calculated?

Form a pair of image (master and slave), the coherence is calculated.
But for a pixel there will be only two values present (One from master and another from slave image).
Then while calculating coherence, only these two values are used OR a window is used to calculate it?

A moving window is used. Please consult help, tutorials and SAR-courses, for example at:

https://saredu.dlr.de/

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