[Insight-users] Get label boundaries

[Dženan Zukić]

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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>
>
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