% Read in the image.
grayImage = imread(yourFileName);
[rows. columns, numberOfColorChannels] = size(grayImage)
if numberOfColorChannels > 1
% It's color so convert to grayscale (luminance).
grayImage = rgb2gray(grayImage);
end
% Get it's mean with mean2().
meanValue = mean2(grayImage);
% Compare the image's mean with your definition of what is high or low.
if meanValue < 142 % or whatever...
classification = 'Low Intensity';
else
classification = 'High Intensity';
end
