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R2014a slower than R2013a

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Pinpress
Pinpress 2014-6-18
关闭： MATLAB Answer Bot 2021-8-20
On the same computer, when running imdilate, R2014a takes 4.1 sec while it was 3.7 sec on R2013a. this is consistent after multiple runs.
se = strel('ball', 4, 4, 4);
bw = imdilate(im, se); % size of im: 512*512*375
Also, why imdilate returns a new matrix with min and max value of 4 and 5, respectively, instead of anticipated 0 or 1??

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