[Insight-users] Get label boundaries

[Martijn Steenwijk]

LabelContourImageFilter constructs an RGB image with a contour, if i
understood correctly. so not quite what I am looking for (just boundary
voxels with label id's ).

Best,
Martijn


On Tue, Feb 25, 2014 at 4:38 PM, Dženan Zukić <dzenanz at gmail.com> wrote:

> I suggested that as a way to compute the required contour while being
> unaware that such a filter, probably computationally fairly efficient,
> already exists.
>
>
> On Tue, Feb 25, 2014 at 4:35 PM, Martijn Steenwijk <
> martijnsteenwijk at gmail.com> wrote:
>
>> Sorry for the late response. I refer to a contour (so in fact what the
>> LabelContourImageFilter is highlighting), not a bounding box. I appreciate
>> the suggestion of using a distance map; however, that would be quite
>> computation intensitive for images in which I have a few thousand labels?
>>
>> Best,
>> Martijn
>>
>>
>> On Tue, Feb 25, 2014 at 1:32 PM, Bill Lorensen <bill.lorensen at gmail.com>wrote:
>>
>>> And here is an example:
>>>
>>> http://itk.org/Wiki/ITK/Examples/ImageSegmentation/LabelContourImageFilter
>>>
>>> Bill
>>>
>>>
>>> On Tue, Feb 25, 2014 at 7:15 AM, Nicholas Tustison <ntustison at gmail.com>
>>> wrote:
>>> > Perhaps this is what is needed:
>>> >
>>> >
>>> http://www.itk.org/Doxygen/html/classitk_1_1LabelContourImageFilter.html
>>> >
>>> >
>>> >
>>> > On Feb 25, 2014, at 7:02 AM, Dženan Zukić <dzenanz at gmail.com> wrote:
>>> >
>>> > I believe he is referring to contours of labels.
>>> >
>>> > Maybe you can calculate distance map, and then zero out the
>>> pixels/voxels
>>> > which are more than 1 pixel away from the boundaries?
>>> >
>>> >
>>> > On Mon, Feb 24, 2014 at 2:46 PM, Bradley Lowekamp <
>>> blowekamp at mail.nih.gov>
>>> > wrote:
>>> >>
>>> >> Hello,
>>> >>
>>> >> What do you mean by boundaries? An axis aligned bounding box? A
>>> oriented
>>> >> bounding box? Or A contour of label?
>>> >>
>>> >> Brad
>>> >>
>>> >> On Feb 24, 2014, at 7:44 AM, Martijn Steenwijk
>>> >> <martijnsteenwijk at gmail.com> wrote:
>>> >>
>>> >> > Hi all,
>>> >> >
>>> >> > Is there any way to easily obtain the (inner and/or outer)
>>> boundaries of
>>> >> > a set of labels (preserving label id's), in order to compute some
>>> statistics
>>> >> > at the label boundaries, for example with
>>> itkLabelStatisticsImageFilter?
>>> >> >
>>> >> > Thanks for ideas in advance,
>>> >> > Martijn
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>>
>>
>> _____________________________________
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>>
>> Visit other Kitware open-source projects at
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