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Tracking, Including Lidar

Tracking anamorphic shots requires many trackers, well-distributed throughout the image frame, with special attention given to the edges, where the most distortion information is present. Thirty active trackers on every frame might be a minimum starting point.

Tip: When auto-tracking, it may give better results if you use the image preprocessor to temporarily resample the footage to a 1:1 pixel aspect (with same overall image aspect), especially with an initial squeeze of 2.

A half-dozen or so zero-weighted canary trackers are a good idea as a monitor against overfitting of the scene, where the solver exactly replicates the noisy behavior of the limited available data, without accurately capturing the overall situation. The canary trackers don’t contribute to the solve, but are evaluated using its results.

When a lidar scan is available, each tracker should be “Placed” on the mesh in the location corresponding to what it is tracking, labeled as a seed point and with full XYZ locking. See the tutorial “ Anamorphic Solve Using a Lidar Scan.”

Then, the solve should use From Seed Points mode with the Constrain turned on so that the tracker coordinates are effective during the solve.

You might also turn on Peg for each tracker, to force the tracker coordinates to be taken exactly. That’s a little risky since any errors can severely impact the solve; it might be better to try it first without Peg, examine the Coordinates listing to find trackers with higher error constraints, double-check them, then ultimately turn on Peg.

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