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SciPy convolve2d vs Matlab conv2 'same' mode
In [198]: f = [[2,3,4],[1,6,7]]
In [199]: g = [[9,1,0],[2,5,8],[1,3,3]]
In [200]: convolve2d(f,g)
Out[200]:
array([[ 18, 29, 39, 4, 0],
[ 13, 71, 108, 51, 32],
[ 4, 26, 71, 104, 68],
[ 1, 9, 28, 39, 21]])
In [201]: convolve2d(f,g,'same')
Out[201]:
array([[ 71, 108, 51],
[ 26, 71, 104]])
In [202]: convolve2d(g,f,'same')
Out[202]:
array([[ 29, 39, 4],
[ 71, 108, 51],
[ 26, 71, 104]])
Compare with the example in http://books.google.com/books?id=fTvQkLBLyK8C&lpg=PA43&ots=0HC1LsH0cE&dq=conv2%20same%20example&pg=PA43#v=onepage&q=conv2%20same%20example&f=false
71 108 51
26 71 104
and
71 108 51
26 71 104
9 28 39
http://www.mathworks.com/help/matlab/ref/conv2.html "If there are an odd number of rows or columns, the "center" leaves one more at the beginning than the end."
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