User Manual

A Repair Frame node set up to analyze a MediaIn node using internal optical flow analysis
Inspector
Controls Tab
The Controls tab includes options for how to repair the frames. It also includes controls for
adjusting the optical flow analysis, identical to those controls in the Optical Flow node.
Depth Ordering
The Depth Ordering determines which parts of the image should be rendered on top by
selecting either Fastest On Top or Slowest On Top. The examples below best explain
these options.
In a locked-off camera shot where a car is moving through the frame, the background does not
move, so it produces small, or slow, vectors, while the car produces larger, or faster, vectors.
The depth ordering in this case is Fastest On Top since the car draws over the background.
In a shot where the camera pans to follow the car, the background has faster vectors, and the
car has slower vectors, so the Depth Ordering method is Slowest On Top.
Clamp Edges
Under certain circumstances, this option can remove the transparent gaps that may appear on
the edges of interpolated frames. Clamp Edges causes a stretching artifact near the edges of
the frame that is especially visible with objects moving through it or when the camera is moving.
Because of these artifacts, it is a good idea to use clamp edges only to correct small gaps
around the edges of an interpolated frame.
Edge Softness
This slider is displayed only when Clamp Edges is enabled. The slider helps to reduce the
stretchy artifacts that might be introduced by Clamp Edges.
If you have more than one of the Source Frame and Warp Direction checkboxes turned on, this
can lead to doubling up of the stretching effect near the edges. In this case, you’ll want to keep
the softness rather small at around 0.01. If you have only one checkbox enabled, you can use a
larger softness at around 0.03.
Chapter – 101 Optical Flow 2246