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From: dai zhengguo on 4 Apr 2010 03:26
My problem is why I can not get the same result since it is well known that the Gaussian filter is separable.
The following is to convolve along rows and then columns.
width = 4 ; ssq = 1 ;
t = (-width:width);
gau = exp(-(t.*t)/(2*ssq))/(2*pi*ssq); % the gaussian 1D filter
aSmooth=imfilter(a,gau,'conv','replicate'); % run the filter across rows
aSmooth1=imfilter(aSmooth,gau','conv','replicate'); % and then across columns

And we construct a 2D gaussian Filter：
G2D = fspecial('gaussian',9,1) ;
aSmooth2= imfilter(a,Gaussianfilter,'conv','replicate');

But the result of aSmooth2 is not the same as aSmooth1, can anybody tell me why ?
Thanks a lot.
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