What is the zeta parameter in the variational refinement method ?

asked 2019-08-23 07:23:38 -0500

The method implemented in class VariationalRefinementImpl (file modules/video/src/variational_refinement.cpp) is a modification from [T. Brox, A. Bruhn, N. Papenberg, J. Weickert. High Accuracy Optical Flow Estimation Based on a Theory for Warping. ECCV (4) 2004: 25-36]

The OpenCV implementation has additional parameters, that do not appear in the original formulation of Brox et al : \delta and \zeta

The OpenCV implementation minimizes : \delta \Psi(E_I) + \gamma \Psi(E_G) + \alpha \Psi(E_S) where E_I,E_G,E_S are color constancy, gradient constancy and smoothness terms respectively. So, the purpose of this additional \delta is clear for me. However, I do not understand the purpose of the additional \zeta, which is used in the computation of the data term. Any comments on this?

Thanks for your time

edit retag flag offensive close merge delete