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– Orange: Low Confidence. May be acceptable in some situations.
– Red: No Confidence. The tracks have not solved well.
Hovering the pointer over any tracking point displays a large metadata tooltip that includes the solve
error for the point. For a more visual representation of the accuracy, you can enable the display of
3D locators in the viewer by clicking the Reprojection Locators button in the viewer toolbar.
After a solve, the Camera Tracker toolbar can display Reprojection locators
When the tracking points are converted into a point cloud by the solver, it creates 3D reprojection
locators for each tracking point. These Reprojection locators appear as small X marks near the
corresponding tracking point. The more the two objects overlap, the lower the solve error.
Reprojection locators displayed with tracking points, and tooltip
The goal when filtering the trackers is to remove all red tracker marks and keep all the green marks.
Whether you decide to keep both the yellow and orange or just the yellow is more a question of how
many marks you have in the clip. You produce a better solve if you retain only the yellow marks;
however, if you do not have enough marks to calculate the 3D scene, you will have to keep some of
the better orange marks as well.
Tips for What to Keep and What to Delete
Understanding what false tracks look like, and then manually cleaning the track data to
reduce it to a precise set of clear tracks, will result in a more accurate solve. When cleaning up
any track—particularly yellow and orange color coded tracks—keep the following in mind:
– Keep all tracks with motion that’s completely determined by the motion of the
live-action camera.
– Delete tracks on moving objects or people and tracks that have parallax issues.
– Delete tracks that are reflected in windows or water.
– Delete tracks of highlights that move over a surface.
– Delete tracks that do not do a good job of following a feature.
– Delete tracks that follow false corners created by the superposition of
foreground and background layers.
– Consider deleting tracks that correspond to locators that the solver has reconstructed
at an incorrect Z-depth.
Chapter 863D Camera Tracking 1576
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