Size of the spot metrology

Hello

I'm trying to calculate the position of the Center and the radius of the smallest circle containing a fraction (say 50%) intensity of the image in an assessment of the surrounding area, the center of gravity (ideally something like 200x200px).
I came with this VI which is definitely too slow (even taking into account only 10px area) that I need to constantly monitor the spot on the CCD sensor.
Is there a better (faster) way to solve the problem?

Thanks in advance,
Max

Hi Max,.

I think that the original VI 'myEW.vi' error in the inner loop.  The top and left offsets are reversed.  Double check my work, but I think that the two screws must ultimately return the same position of Center.

I should have clarified that I was describing a process of binary search, as opposed to linear increasing the size of the circle and not wearing is not on an analysis of the traditional binary particles.  This binary search should return the same result, but in less than iterations.

In addition, the found location depend on the search order of pixels.  There may be several sites with the same minimum size of circle and the final result may depend on where you start.

Finally, for improved accuracy, you can adjust the diameter of the circle research 1-pixel increments, rather than the RADIUS.

Thank you

Brent

Tags: NI Hardware

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