Re: strel (was: image processing function list)

[Søren Hauberg]

ons, 01 12 2010 kl. 15:49 -0800, skrev George:
> Søren Hauberg wrote: >Why do you need this function? My impression has
> always been that this >function essentially was useless, though I
> might have missed something >obvious... You may wish to consult the
> documentation for strel to appreciate its value.
> http://www.mathworks.com/help/toolbox/images/ref/strel.html In
> particular: "For all shapes except 'arbitrary', structuring elements
> are constructed using a family of techniques known collectively as
> structuring element decomposition. The principle is that dilation by
> some large structuring elements can be computed faster by dilation
> with a sequence of smaller structuring elements. For example, dilation
> by an 11-by-11 square structuring element can be accomplished by
> dilating first with a 1-by-11 structuring element and then with an
> 11-by-1 structuring element. This results in a theoretical performance
> improvement of a factor of 5.5, although in practice the actual
> performance improvement is somewhat less. 

Ok, that's reasonable; I did not know this. Currently, we do not support
this (patches will be accepted, should they be provided :-) ).

Søren