sum the matrix 3x3 and looping

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renuka
renuka 2014-2-28
编辑： renuka 2014-3-2
how to calculate the total of overlap region 3x3 of a matrix and include loop function as it continue to calculate row by row and column by column.
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the cyclist
the cyclist 2014-2-28
编辑：the cyclist 2014-2-28
This is not even close to detailed enough to help you. For starters, what does "overlap region" mean?
Please remember, we only know what you tell us about your problem.
Here is a nice guide to asking good questions here: http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer
renuka
renuka 2014-3-1
编辑：renuka 2014-3-2
sorry, it suppose to be like this. i have the code to calculate the sum for the matrix, but dun't know how to do the looping part.
t=rand(6,6)
total = 0;
for i=1:3
for j=1:3
total = total + t(i,j)
end
end

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Image Analyst
Image Analyst 2014-3-1
That can be done very simply with imfilter() or conv2():
outputArray = conv2(double(inputArray), ones(3), 'same');
Every element (pixel) in the output array (image) will be the sum of input elements (pixels) in the sliding window.
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Image Analyst
Image Analyst 2014-3-2
编辑：Image Analyst 2014-3-2
x = [1 2 3 4;5 6 7 8;9 10 11 12;13 14 15 16]
theSums = conv2(x, ones(3), 'valid')
Result:
theSums =
54 63
90 99
As you can see, you forgot one sum. Please mark the answer as Accepted if we're done here. Thanks.

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