How do I get the inverse of matrix D when estimating displacement field(D) that aligns two 2-D images?

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OJ27
OJ27 on 15 Feb 2017
Edited: KSSV on 16 Feb 2017
Hi, I am using this demo for my project https://www.mathworks.com/help/images/ref/imregdemons.html?searchHighlight=non%20linear%20transform%20image&s_tid=doc_srchtitle
but was wondering how to calculate the inverse of the matrix D that the command imregdemons outputs.

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