Calculate mean of gray Value
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Hello, In this picture I want to calculate mean of the circle. but when I use mean( ) it calculates all the pixels including the black ones, so the mean value decreases. Is there a way to calculate only the gray value?
Thank you in advance.
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Chad Greene
2021년 3월 31일
Try this. Below I'm creating an example matrix M, and calculate the mean of only the values that exceed zero:
M = peaks(100); % example matrix
M(M<=0) = 0;
figure
imagesc(M)
colormap(gray)
colorbar
mask = M>0; % logical mask corresponding to all values greater than zero
figure
imagesc(mask)
mean(M(mask),'all') % mean of all values of M that exceed zero.
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