How to recover little movement of an electric board during optical inspection

Good day to all.
I'm developing a software for an optical inspection task of the PTH mounted components. My software can already recover little deviations of the position of the PCB, thanks to the presence of a pair of fiducials, and so reposition the ROIs. Due to new requests from the customer i need to inspect the PCB at variables levels of zoom.
Therefore the software must work in two steps:
1 - Zoom the camera at a level that guarantee the vision of the two fiducials at the same time and computing of the deviation in the position (shift and rotation).
2 - Zoom the camera to a more pronounced level to arrive at the "inspection level" of zoom and repositioning the ROIs due to the informations gained at point one.
My question is: how can i accomplish the passage from point 1 to 2? Can i use the deviation at "zoom level 1" to correct positioning the ROIs at "zoom level 2"?
Thank you, Francesco.

Hello,
when you use optical zoom, the focal lenght changes as does the optical magnification. So you cannot use the deviation form 1. to 2. directly.
I am just throwing out ideas here, maybe someone has a better solution...
I would say that the easiest way is to measure an object of known size in scenario 1 and calculate the deviation. Then go to scenario 2 and measure the same object. Assuming that the magnification is linear, calculate deviation using the object size ratio.
You could probably also solve the problem by calibrating the camera at both focal lenghts...
Let's see if anybody else has something to say.
Best regards,
K
https://decibel.ni.com/content/blogs/kl3m3n
"Kudos: Users may give one another Kudos on the forums for posts that they found particularly helpful or insightful."

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