Merge calibration files

Calibration files can be merged in the case that a measurement volume cannot be calibrated at the same time. The calibration files must include the same cameras, i.e. cameras that are unused for a volume must still be connected during the calibration of that volume. Calibration can for example be merged in the following situations.

  • A fixed camera system when not all of the cameras can be calibrated at once.

  • Separated volumes that don't overlap, for example measuring in two different rooms.

Follow these steps to calibrate and then merge calibration files.

  1. Disable the cameras that can't be used for a certain volume on the Linearization page in Project options.

  2. Calibrate with the remaining cameras in the system. Remember the name of the calibration file.

  3. Enable the other cameras on the Linearization page and disable the first set of cameras. It is possible to merge any number of calibration files so the system can be divided into any number of calibration files.

  4. Calibrate the system again and remember the name of the calibration files if there is more than one.

    • For separated volumes it is necessary to translate the coordinate system. It is recommended that the L-frames are placed in the same direction to make it easier to measure the distance. Measure the distance between the L-frames and enter the distance in x, y and z on the Transformation page in Project options, see chapter Transformation.

      For systems above and under water it is recommended to use the Twin system feature and use the Twin system calibration to define the relations between the coordinate systems.

  5. When all calibrations are finished, open the Current calibration page in Project options and click on Load other.

  6. Select all of the calibration files made in the previous steps and click on Open.

  7. The calibrations are merged and the result of the merge is displayed in the Calibration results. The merged calibration is saved as a QCA file but it only includes the calibration results and not the individual 2D data. If any reprocessing is needed for the calibration use the original files and repeat the merge.