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Theia Axiom - v2025
Theia Axiom - v2025
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  • Load Videos
  • Camera Type
  • Load Default RX0 II Intrinsics
  • Load Object
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  • Add
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  • Auto-Step
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  • Reset Camera
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  1. Theia3D Documentation
  2. Theia3D Dropdown Menus
  3. Calibration Menu

Object Calibration

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Last updated 17 days ago

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The object calibration dialog

Object calibration is performed in order to determine the position and orientation of all cameras in the system in 3D space using a recorded object calibration trials. See for detailed instructions for recording object calibration trials.


Load Videos


Camera Type

Detects and indicates the camera manufacturer based on the videos loaded. This allows the automatic application of default Sony RX0 II camera intrinsic parameters when the calibration videos were recorded using this camera system (see below).


Load Default RX0 II Intrinsics

Load default lens calibration parameters for Sony RX0 II cameras and apply them to all cameras. This can be used to avoid performing a lens calibration when using the RX0 II cameras. Loading default intrinsics overwrites any existing lens calibration parameters. Note: These parameters are only valid for Sony RX0 II cameras with standard lenses. For any other cameras or lenses these default parameters are invalid.


Load Object

Load a TXT file defining the calibration object. Each line of the file contains comma-separated x-y-z coordinates of one of the key points on the object in mm. To load the object, browse to and select the object file. Once loaded, the object points will be displayed in the table.

A minimum of 6 points per camera is required to calibrate the system using object calibration.


Save Object

Save the current object definition. To save the object, browse to the desired save location and enter the desired filename.


Add

Add a calibration object point definition (x, y, z coordinate values).


Remove

Add a calibration object point definition (x, y, z coordinate values).


Auto-Step

If checked, the selected object point will advance each time a point is identified in one of the 2D views.


Cam ID

The ID of the camera corresponding to the current 2D view. Use the drop-down to select a different 2D view. Maximizing a view will automatically select it.


Reset Point

Remove the currently selected point from the current view.


Reset Camera

Remove all points from the current view.


Reset All Cameras

Remove all points from all views.


Calibrate Cameras

Perform the extrinsic calibration for all of the cameras. After performing the calibration, the position of any camera points that were not identified before the calibration are calculated and drawn in the 2D views as an ‘*’.


Adjust Origin

When using the checkerboard extrinsic calibration, sometimes the origin may appear at an undefined location because the board was not recognized in the origin frame. This feature allows you to adjust the reference frame by clicking on an object (typically four squares on the checkerboard). Since the frame is just being adjusted (not computed), a calibration needs to be loaded to use this feature, and the relative pose of the cameras will be unchanged.

To adjust the origin, you need to manually identify the object points for three cameras only.

Load video files (MP4 or AVI) containing the extrinsic calibration object. To load the videos, browse to and select the folder containing the videos. The structure of this folder must conform to the format described in.

As with the method, the results dialog window provides the options to Save, Save & Assign, or to acknowledge and close the results dialog window using Ok.

Video Data
Chessboard Calibration
Recording Extrinsic Object Calibrations
The object calibration dialog is used to calibrate extrinsic camera parameters (camera position and orientation).