Re: [Algorithms] Gaussian blur kernels

[Simon F. <sim...@po...>]

Sam Martin wrote:
> I'm not sure I quite understand what you mean by antialiasing in your
> experiment? 

Sorry, I thought that was obvious from the context :-(
Pragmatically, I meant take NxN samples per pixel, apply the (trivial)
weighting due to a box filter (i.e. 1/N^2), and either choose a "large
enough" N or take the limit as N->infinity.  The latter should then be
your integral below.

> To remove the aliasing completely you can't blur after sampling*.
> You'd need to rasterise the line by doing the integral over each
> pixel properly, rather than point sample. This will produce an
> alias-free result, but isn't exactly easy in general :).   

I wasn't intending it to be easy :-).  I just wanted to show that a box
filter is not ideal.

Cheers
Simon