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From: Ian Scott <ian.scott@st...> - 2003-12-10 11:40:19
There is lots of code in contrib/mul/vimt to do pyramid building.
Have a look at the vimt_pyramid_builder hierarchy.
The gaussian pyramid builders use those vil_gauss_reduce functions to do the
actual pixel calculations.
> -----Original Message-----
> From: Ian Scott [mailto:ian.m.scott@...]
> Sent: Wednesday, December 10, 2003 11:36 AM
> To: 'Laymon, Marc A (Research)'
> Cc: 'vxl-maintainers@...'
> Subject: RE: [Vxl-maintainers] alternative to vil_decimate
> There are some functions called vil_gauss_reduce, which
> (conceptually) do gaussian smoothing followed by
> downsampling. I'd suggest following the same pattern, and
> (bearing in mind Joe's remarks,) call it vil_cubic_reduce or
> > -----Original Message-----
> > From: Laymon, Marc A (Research) [mailto:laymon@...]
> > Sent: Tuesday, December 09, 2003 9:24 PM
> > To: 'vxl-maintainers@...'
> > Subject: [Vxl-maintainers] alternative to vil_decimate
> > I have just been using vil_decimate to process large NITF images and
> > create a set of pyramid images. If I understand the code
> > vil_decimate just uses every n'th pixel if the factor is n.
> > I have been asked to create a mechanism for doing something similar
> > to vil_decimate but that uses averaging. For example if
> > the factor is
> > two, this class would average the pixel with its neighbor to
> > the right,
> > that pixel's neighbor below and the pixel to the left of that.
> > Does something similar already exist ?
> > If not, does vil_downsample seem like a reasonable name ?
> > Thanks.
> > Marc Laymon
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