Which transformation is used here?

[adrianloy]

Hi,
Just a short question: Which transformation is implemented in this DIRnet? Is it a cubic B spline transformation as described in "Nonrigid Registration Using Free-Form
Deformations: Application to Breast MR Images" (Section II B) and mentioned in the original DIRnet paper?

Thanks in advance, and nice code!
Cheers

[iwyoo]

Actually, I used a simple bicubic interpolation on vector control points. I'm not sure it is same with cubic B-spline. You can check https://github.com/iwyoo/bicubic_interp-tensorflow and https://blog.demofox.org/2015/08/15/resizing-images-with-bicubic-interpolation/.

[o0t1ng0o]

Hi, @adrianloy

Did you figure out whether the transformation is cubic B spline transformation?

Many thanks!