Re: [Algorithms] Gaussian blur kernels

[Jon W. <jw...@gm...>]

Fabian Giesen wrote:
> versions of both the signal and the filter. But the details don't 
> matter, since we don't have to write it in terms of convolutions here!
>
> That was the whole point of my previous mail. There's no point computing 
> the 5x5 Gaussian convolution at full res only to throw away 3 out of 
>   

Oh, yeah, of course. I mis-understood your meaning, because the point 
was too obvious :-) So, yes, the down-sampling operation is, at the end, 
a single pass (assuming you do a 2D Gaussian in a single pass), and it 
samples some number of samples from the source, per output pixel. I 
guess even considering the "filter THEN discard" implementation is just 
too alien for those of us who have been actually implementing these 
things for so long that the details blend with memories of college beer 
bashes in the distant past...

Sincerely,

jw




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