[Insight-developers] Problem with LabelMap and negativ spacing

[Bradley Lowekamp]

Hi,

I have always assumed that the spacing is positive. I am surprised that it wasn't enforced or check else where.

Generally the direction cosine matrix is used for orientation.

Why are you using a negative spacing? (that does just sound wrong to me)

Brad



On Jun 7, 2013, at 6:50 AM, Carsten Kendziorra <carsten.kendziorra at charite.de> wrote:

> Hello,
> 
> I'm using a itk::BinaryImageToShapeLabelMapFilter to create a itk::LabelMap and take afterwards a an object:
> 
> itk::LabelMap::LabelObjectType* labelObject = labelMap->GetNthLabelObject(LabelNumber);
> 
> Unfortunately
> labelObject->GetEquivalentEllipsoidDiameter()
> returns [-nan, -nan, -nan], if the spacing of the BinaryImage is negative. Everything works fine for positive spacing.
> 
> Is negative spacing not allowed here? Or how to deal with negative spacing?
> 
> Thanks for any help!
> Carsten
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