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Revision as of 14:53, 16 May 2017

Intro

This is a FAQ for Autopano Video 3 and it's new features.
New questions will surely be added so be sure to check back regularly!



What is D.WARP?

D.WARP is Kolor's answer to stitching issues. It is a parallax compensation algorithm. This means that computer vision automatically fixes the viewpoint differences between two videos. It goes beyond just fixing parallax, it also helps with synchronization issues and rolling shutter glitches. We believe D.WARP will also allow to fix most of the stitching issues coming from your shots and this will dramatically reduce the time needed to fix stitching issues during post-production.


Is D.WARP a motion flow stitching algorithm?

Not really. Motion flow based algorithms are computing a complete motion flow on the images, which is costly and can fail when there is no solution (something visible in one camera can be masked in the other one). D.WARP is smarter than that. It only examines the overlapping area between cameras and computes a deformation in source image so that both images fit on the seam.
This approach has 2 advantages, the first one is that the deformation (or warp) of sources images is smoothly diffused toward the center of images, avoiding too much pixel stretching like what is sometimes visible on some motion flow implementation. The second is that the approach is time-coherent which makes the algorithm relevant to moving cameras or subjects. Simple motion / optical flow approaches fail in both areas.


Will it fix any parallax?

The amount of parallax it can fix (closest object distance) highly depends on the size of the overlapping area. In shots made with Omni, we can correct objects that are at least 60cm away. Again, we expect this algorithm to work on many cases but not all cases. All feedback on failure cases will help us improve D.WARP. Does it work with moving cameras? Yep, D.WARP works for both static and moving shots. Later we will add some settings to tune the D.WARP algorithm that will enable you to get even better results for all situations.


What type of new artifact will D.WARP create?

As D.WARP is mainly a warp mesh on the source videos, you can see artifacts that you can expect from such approaches e.g. backgrounds "bumping" around fast moving objects entering the frontiers or bent straight lines.
Note: In many cases, D.WARP won't deteriorate the content quality of the source the way motion flow algorithms do.


Is D.WARP compatible with any rig?

Currently D.WARP only works with the OMNI rig. The reasons are the following:

  • The geometry is known
  • The synchronization is perfect
  • The overlaps are big enough for D.WARP

Omni was the first choice for D.WARP, but our aim is to make D.WARP compatible with more rigs. Stay tunned for updates on that.






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