Use dynamic functions to show intensity distribution?

Questions
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1

Hi,

I have almost no experience in mathematica or any coding language and after I have read “the introduction to dynamics” I still cannot solve the problem.
It feels like that I need knowledge of the mathematica language logic but I have no idea what I shall read.
I hope you guys can give me a hint. Any help is appreciated.

The Goal of the code:
Read the image. Interactively chose a square area then the code shows the intensity distribution of the encircled area with listplot3D.

The problem is that the plot did not show up, but subimage$$ instead. Looks like this is just a labeling of variable?

The code I tried is attached. Thanks a lot!

2

Try and see if the attached version of your initial code fits your needs.
I wasn’t exactly sure what data you wished to plot in the ListPlot3D, so you may have to play with that.

The output should look like the image here below

postcode_MAF.jpg
postcode_MAF.jpg896×408 66.2 KB

3

Thank you Massimo!
I shall be able to figure out my code with yours as the reference.