Hi Brad,
my binary image is extracted from a DICOM with negative spacing in
z-direction. I didn't produce them and I'm not sure why some have
negative and some positive spacing in z-direction, but in principle it's
possible.
Carsten
On 06/07/2013 12:55 PM, Bradley Lowekamp wrote:
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 <[email protected]>
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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