Re: Rolling Ball

Posted by Gabriel Landini on Dec 12, 2009; 11:44am
URL: http://imagej.273.s1.nabble.com/Rolling-Ball-tp3690109p3690111.html

On Friday 11 December 2009, you wrote:
> Actually these scale the ball in a way
> that is not really consistent, so, e.g., when changing the radius
> from 10.00 to 10.01 you get a jump in the behavior. Since many people
> rely on 'Subtract Background' to behave as it always did, this cannot
> be changed any more.

Hi Michael,
Why not? One can add a checkbox for an alternative or more precise
algorithm...  (like the sliding paraboloid option which seems to reduce some
ugly artifacts) and set this as default via the StartupMacros file if one
wants the better method.

I think some other algorithms have changed over the years (wasn't the gaussian
filter one of those?).
I agree that it would be better not to *break* things, but this seems like a
worthy improvement. One could replace the old algorithm for a new one and
still provide a plugin using the old method for those who want to repeat the
old behaviour.

I am not convinced that a posteriori background subtraction should be
privileged as to not be ever changed for better algorithms. It is not only a
last resort method, but also tends to introduce artifacts. Do we want that
forever? [I am sure somebody will say "yes" :-)  ].

Cheers

Gabriel