Sobel

[Tony Yu]

+1 on the change. This caused problems for the SciPy 2014 tutorial and
required switching to the scipy implementation.

One option would be to create new functions; e.g. `sobel_h`/`sobel_v` (or
`sobel_x`/`sobel_y`; in this case, it might make sense to match x/y with
the gradient direction rather than the edge direction). Alternatively, we
might consider adding a warning and a `deprecation_warning=True` flag to
`hsobel`/`vsobel`. That way, users can adapt to the change (if necessary)
and turn off the deprecation warning.

-Tony

On Wed, Nov 19, 2014 at 9:53 PM, Johannes Schoenberger <jsch at demuc.de>
wrote:

> How do we want to treat this change in behavior? Raise a warning?
>
> > On Nov 19, 2014, at 10:45 PM, Johannes Schoenberger <jsch at demuc.de>
> wrote:
> >
> > What is the reference implementation in this case? Scipy?
> >
> >> On Nov 19, 2014, at 10:43 PM, Juan Nunez-Iglesias <jni.soma at gmail.com>
> wrote:
> >>
> >> Is it what the "reference" implementation returns? Either way the sign
> is valuable info. +1 for returning the actual filter output.
> >>
> >> On Thu, Nov 20, 2014 at 11:25 AM, Johannes Schoenberger <jsch at demuc.de>
> wrote:
> >> Hi,
> >>
> >> Why are we returning the absolute values in the hsobel and vsobel
> functions?
> >>
> >> I do not see the benefit.
> >>
> >> Johannes
> >>
> >> --
> >> You received this message because you are subscribed to the Google
> Groups "scikit-image" group.
> >> To unsubscribe from this group and stop receiving emails from it, send
> an email to scikit-image+unsubscribe at googlegroups.com.
> >> For more options, visit https://groups.google.com/d/optout.
> >>
> >>
> >> --
> >> You received this message because you are subscribed to the Google
> Groups "scikit-image" group.
> >> To unsubscribe from this group and stop receiving emails from it, send
> an email to scikit-image+unsubscribe at googlegroups.com.
> >> For more options, visit https://groups.google.com/d/optout.
> >
> > --
> > You received this message because you are subscribed to the Google
> Groups "scikit-image" group.
> > To unsubscribe from this group and stop receiving emails from it, send
> an email to scikit-image+unsubscribe at googlegroups.com.
> > For more options, visit https://groups.google.com/d/optout.
>
> --
> You received this message because you are subscribed to the Google Groups
> "scikit-image" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to scikit-image+unsubscribe at googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/scikit-image/attachments/20141119/f54fa8e6/attachment.html>