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How to find avergae of thresholded elements only from a matrix?

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I am trying to calculate average RGB of images with a uniform background. So I want to remove the background from the calculation. How do I select only elements belows above/below certain value (say <250) and calculate average of those only.

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Jan
Jan on 20 Aug 2019
@Tarunkishwor Yumnam: Please do not advertise questions in other threads. Imagine the clutter, if all users do this. Thanks.

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Accepted Answer

KSSV
KSSV on 20 Aug 2019
Let A be your matrix......say you want values below a threshold val.
idx = A<val ;
themean = mean(A(idx)) ;

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