How do to comparatively analyze 2 points of an image to distinguish them

I need to come up with a way to comparatively analyze 2 points to show that they are different (i.e. one box is lighter and one box is brighter or some other way to distinguish two points).

I thought about summing the matrix it creates but I don't think this is the best way.

Any suggestions?

Answer 1

[Chad Greene]

Can you convert the image to grayscale see which point has a higher value?

Answer 2

[Image Analyst]

row1 = hem_ul(2); % y
row2 = hem_ll(2);
col1 = hem_ul(1); % x
col2 = hem_ur(1);
meanValue = mean2(yourImage(row1:row2, col1:col2));

[Image Analyst]

For anyone wondering, those hem_** values came from your m-file, which you have since removed.