Directed Video Stab

[ishank-juneja]

Add saliency constraints as described in the paper to implement directed video-stabilization

[denny3388]

Hi! Thanks for your excellent work! I just wonder that have you added the saliency constraints?

[ishank-juneja]

I haven't gotten around to it yet, hence the open issue.
I am happy to merge someone else's contribution that solves the problem