Integers can only be combined with integers of the same class, or scalar doubles.

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charuleelaa vanilavarasu
评论： charuleelaa vanilavarasu 2016-2-3
mask = 1-double(im2bw(gray, graythresh(gray)));
strel = [0 1 1 1 0; 1 1 1 1 1; 1 1 1 1 1; 1 1 1 1 1; 0 1 1 1 0];%structuring element
shadowavg_red = sum(sum(image(:,:,1).*shadow_core)) / sum(sum(shadow_core));

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Walter Roberson
Walter Roberson 2016-2-3
Whatever your shadow_core is, it is double precision, but your image variable is integer data type.
shadowavg_red = sum(sum(double(ImageArray(:,:,1)).*shadow_core)) / sum(sum(shadow_core));
or better yet,
mean(ImageArray(logical(shadow_core)))
Note the renaming of image to ImageArray. Using a variable named "image" always leads to problems.

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