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Separated vs Merged Models
There are two separate sets of anamorphic models, “merged” models and “separated” models.
The separated models are not specially indicated; they are the normal more complex models used on difficult shots. They have two separate sets of the nine C nn parameters: one set of nine CXnn parameters for X-axis distortion, and a second set of nine CY nn parameters for the Y-axis distortion. The two separate sets give the separated models more flexibility to adapt to complex distortions, though a very large discrepancy may indicate an unlikely nonphysical solve.
The Merged model uses the same set of Cnn parameters for both the X and Y axes. As a result, it can accommodate less complex distortion, but it requires a smaller number of trackers and requires less motion to generate an adequately constrained solution. The merged models are probably a better choice for shots such as a hand-held closeup that is largely static.
You can start with a Merged model for initial solving, then change to the separated model. The Merged model’s parameters will be duplicated to the
corresponding parameters of the separated model, and you can continue to refine the solve from there.
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