[Insight-users] Distance map computation on an empty image

[Luis Ibanez]

Hi Andrey,

Thanks for pointing this out,
and for the detailed report.

Particularly for including the source code and
images that illustrate the problem.

I was able to replicate the problem, and it seems
indeed to be a bug in the Danielsson distance
filter.

Curiously, this incorrect behavior happens
regardless of whether we declare the filter
to work on a 2D or a 3D image.

I also added an image iterator to your Danielsson
test in order to further verify that the input image
is null.

Could you please log a bug entry for this issue:

http://public.kitware.com/Bug/my_view_page.php

and upload your .tgz as the reference file that
can be used for replicating the problem ?


    Thanks


         Luis


---------------------------------------------------------
On Fri, May 7, 2010 at 4:28 PM, Andriy Fedorov <fedorov at bwh.harvard.edu> wrote:
> Hi,
>
> I am processing a binary image once slice at a time, and calculate
> distance transform on each slice. Naturally, some of the slices are
> empty, which brought me to this problem which I describe next.
>
> If I use Danielsson filter to compute a distance map of the image that
> is empty (all pixels are 0), I get a non-zero image, with values
> increasing from the image corner (see the result image screenshot
> here: http://dl.dropbox.com/u/3770904/dt_result_screenshot.png)
>
> If I use Maurer filter, I get all values assigned to -INF.
>
> The code (ITK examples) with the input images, which allows to
> reproduce this result, can be downloaded here:
> http://dl.dropbox.com/u/3770904/DanielssonTest.tgz
>
> Is this a bug?
>
> Andrey Fedorov
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