[ITK] [ITK-users] Offset directions

[med aweng]

Hello,


For the directions (degrees): 0, 45, 90, 135, if I want to apply them on an
image, I knew that for instance here:
https://github.com/ComplexSystemsModeling/DCMTK-ITK/blob/master/Modules/Numerics/Statistics/test/itkScalarImageToRunLengthMatrixFilterTest.cxx

 {0,-1} is "vertical", and {-1,0} is "horizontal".

Can you kindly just clarify to me how it was known that the first is
vertical and the later is horizontal? And, if we want to represent 35
degrees and 135 degrees, how will this be represented?

Thanks.
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