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

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Tarunkishwor Yumnam
评论： Tarunkishwor Yumnam 2019-8-21
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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KSSV
KSSV 2019-8-20
Let A be your matrix......say you want values below a threshold val.
idx = A<val ;
themean = mean(A(idx)) ;

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