tuning parameter k2

[lyn-max]

Hi,

1. I'm curious that in the paper k2h = kDetail / (kShrink * A), but in your implementation k2h = kDetail / kShrink * A, why did you modified it?
2. From formula derivation is [c,s]T corresponding to k1, and [s,-c]T corresponding to k2? Also, in your implementation they were reversed.

regards max

[kunzmi]

Hi Max,

good question, it has been a while that I was fighting with these equations ;-)
I was checking for my notes from that time but I didn't find them, at least the part of interest is missing... So I have to rely on my memories:

1. I don't remember if I had a specific mathematical reason for that or just try and error. Given that the formula for A was already wrong the following isn't really reliable. I remember though that I tried to reproduce the kernels of figure 8 in the main paper and if I didn't mess up things, the code should reproduce these kernels (whereas the kernel in the figure seems normalized, so only the shape and ratios count).
2. yes, I changed these, otherwise your kernel is transposed. At the end the only question is, if your kernel is a row first or a column first matrix, or if you flip x and y, etc. Maybe my indexation is wrong, mayber there's, I didn't check that, all I wanted is that the kernel shown in the GUI matches the edges and that the calculations are correct, which should be the case.

Cheers,
Michael

[lyn-max]

@kunzmi thanks for your excellent work!