Reoptimize calibration - PIX4Dmatic


This article describes the Reoptimize calibration feature, when it becomes visible, and when to utilize it.

Reoptimize calibration

Reoptimize calibration feature updates the internal and external camera parameters when new inputs, like marks on images have been added after the Calibrate step has been run. It is a faster method for updating calibration and improving accuracy when compared to re-running the initial Calibrate step.

Reoptimize calibration can be used when there have been changes to:

  • Ground Control Points (GCPs).
  • Checkpoints (CPs).
  • Manual Tie Points (MTPs)

These changes include adjusting, adding or removing marks on images for existing tie points. Additionally, if a tie point has been added or removed entirely from a project, Reoptimize calibration can be initiated.

Important: The project is reoptimized only when all other Calibrate options remain unchanged. For example, when changing the Image scale or Keypoints, the Calibrate step must be re-run in place of Reoptimize.

Out of date layers

When there has been a change orange dots will appear in the Content panel indicating which layers are considered out of date, and thus require updating. In this case, reoptimization can quickly update the Calibrated cameras.


An example of an out of date layer.

When a layer requires updating the Reoptimize calibration step will become visible under the Calibrate step in the Processing options panel. Once the Reoptimize calibration step has completed the orange dots will disappear indicating that the layer is current, and successive processing steps can be initiated. 


Reoptimization calibration.

Important: When images have been removed or new images have been added the Calibration step must be re-run.
Note: If all processing steps (Densify, Mesh, DSM, and Orthomosaic) have been completed and the calibration has been reoptimized, then all successive steps will be considered out of date and thus will need to be processed again.



Rematch option.

When enabled, this feature is a quicker method for computing more matches between the images, and therefore more Automatic Tie Points. Rematch is recommended to use when:

  • Trying to manually calibrate cameras that were not initially calibrated.
  • For difficult projects where few matches were initially found.
Note: This option will add more time to the Reoptimization calibration process.
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