SimpleITK 3.0.0 Alpha 3

[Niels_Dekker]

Thanks for embracing the new Sobel coefficients for 3D, @blowekamp

@blowekamp

I believe that there was a discussion some place about why the legacy behavior was wrong it would probably be good to include that in the notes. So you know where the discussion occoured? Is this it: Sobel operator extended for 4D, legacy support for 3D, OK?

Yes indeed! I added the following motivation at https://github.com/InsightSoftwareConsortium/ITK/pull/5718 :

The new coefficients are more commonly used by other toolkits, including SciPy’s scipy.ndimage.sobel, and correspond with https://en.wikipedia.org/wiki/Sobel_operator

Technically, the new coefficients for 3D are computed by the very same algorithm as the coefficients for 2D, 4D, …, and ND. So in that way, they are consistent with the other supported dimensionalities.