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

[Andriy Fedorov]

Hi Luis,

Thank you for looking into this.

I submitted the bug report http://www.itk.org/Bug/view.php?id=10757

AF



On Mon, May 24, 2010 at 12:05, Luis Ibanez <luis.ibanez at kitware.com> wrote:
> 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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>