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how to calculate intensity

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Elysi Cochin
Elysi Cochin 2013-2-6
I really appreciate your help and I would be so grateful if you help me with this?,
how to calculate, the difference between the number of pixels in a block and the ratio of the sum of pixel intensities in the block to the maximum in the block
i wanted to substitute the values in the equation in the link below.....
http://img89.imageshack.us/img89/1788/bdipt.png
please do reply.....

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Walter Roberson
Walter Roberson 2013-2-6
I = rgb2gray( im2double( YourImage) );
T = M(x : x+M-1, y : y+M-1);
sum(T(:))
max(T(:))
and I'll leave you to work out the ratio.
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Image Analyst
Image Analyst 2013-2-9
编辑：Image Analyst 2013-2-9
Of course you could do this all in one to three lines with a vectorized approach using conv2() and imdilate(), like this (untested):
blurredImage = -conv2(yourImage, ones(M)/M^2, 'same') + M^2;
maxImage = imdilate(yourImage, true(M));
BDIP = blurredImage ./ maxImage;

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