[ITK] Determine surface area of certain region in image

[Dženan Zukić]

Hi Matthias,

perimeter should be surface area in 3D (which you can divide by 2 to
eliminate back side if you have a very flat object). In 2D image, it is the
circumference. In 2D image, you can get object's surface area by counting
how many pixels it has and then multiplying that by the size of each pixel
(spacing[0]*spacing[1]).

Regards,
Dženan

On Wed, Aug 10, 2016 at 2:40 AM, Matthias B <matthias.b at hotmail.com> wrote:

> Thank you for answering!
>
> At this moment I get the perimeter in pixel units (not the surface area of
> my X,Y-data) of my labeled image.
> I have also really no idea how to use my 3D data with a labeled image. I
> see no way how to add 3D data to a LabelMap for example.
>
> This is what I have at the moment.
> Dim labelShapeStatistics = New simple.LabelShapeStatisticsImageFilter()
> labelShapeStatistics.Execute(labelImage)
> Dim perimeterValue= labelShapeStatistics.GetPerimeter(1)
>
> Thanks for any help, Matthias
>
>
>
> ------------------------------
> From: blowekamp at mail.nih.gov
> To: matthias.b at hotmail.com
> CC: community at itk.org
> Subject: Re: [ITK] Determine surface area of certain region in image
> Date: Tue, 9 Aug 2016 15:58:56 +0000
>
>
> Hello,
>
> You should look into the label map framework [1]. In particular the
> LabelImageToShapeLabelMapFilter[2] and the Perimeter attribute [3] [4].
>
> HTH,
> Brad
>
> [1] http://hdl.handle.net/1926/584
> [2] https://itk.org/Doxygen/html/classitk_1_1LabelImageToShapeLabelMapFilt
> er.html
> [3] https://itk.org/Doxygen/html/classitk_1_1ShapeLabelObject.html#
> aff1209e925293c15775520ef89e97afb
> [4] http://hdl.handle.net/10380/3342
>
> On Aug 9, 2016, at 11:50 AM, Matthias B <matthias.b at hotmail.com> wrote:
>
> Hello ITK-community,
>
> At the moment I'm working with 3D Images with following structure:
> 100x80x3. Every pixel contains a X,Y,Z value.
> I want to calculate the surface area of a certain region that I have
> defined with a boolean 2D-Image (100x80).
> The surface area should only be calculated with the X,Y-data.
>
> In Matlab I have experience with this by using the function bwboundaries
> on the boolean image. This function determines the indices of the the
> boundaries in clockwise direction.  Next I take the corresponding X,Y
> values of the indices so I can calculate the surface area with the function
> polyarea.
>
> Is this possbile with the ITK-library?
>
> Thank you for your help guys.
>
>
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