Quote:
Originally Posted by Wilbert
The author of Panorama Tools doesn't define a polynomial on [-4,-3]. If you do it correctly (using 8 splines, setting yj=0 except at the center), you will get this one: http://forums.virtualdub.org/index.p...&f=11&t=17212& (see post: May 20 2009, 02:44 AM). I don't see any difference with the existing Spline64 though. |
Wilbert, I hadn't seen your reply when I made the previous post.
After looking at the vdub forum thread, I think there is some confusion over the underlying process. Your method (from Panorama tools) fits a spline through the sample points and then derives the filter kernel from the resulting blending polynomials. The approach suggested by phaeron derives the kernel
itself as a spline. It's not clear to me which is more 'correct', or if there is an equivalence between the two approaches at some level.