How to calculate RMS of ring and center of dark area

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Tina Hsiao 2021-4-29

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https://ww2.mathworks.cn/matlabcentral/answers/816880-how-to-calculate-rms-of-ring-and-center-of-dark-area

评论： Tina Hsiao 2021-4-29

Hello, I would like to seek your help. I have an ellipse beam shape. How can I calculate the RMS of ring shape and RMS of center of dark ellipse area by using matlab program ? Thanks a lot.

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Image Analyst 2021-4-29

What does that mean? Do you somehow want the RMS of the shape (x-y coordinates), or do you want the RMS value of the gray levels within the shape? And there are 3 or 4 ring shapes - which one are you talking about?

Tina Hsiao 2021-4-29

I think I would like to know the RMS value of the gray levels within the shape. The ring shape created by the Elliptical Laguerre-Gaussian (P=0, L=5). So far as I know, the ideal beam ring shape intensity is uniform,

but the data does not uniform. I would like to know how uniform of ring intensity shape is. So I try to give a RMS as an index. Could you give me a help? Thanks a lot

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