Calibration

A calibration describes a camera precisely: its lens (focal length, optical centre and fisheye distortion), where the motion sensor sits relative to the camera, and the small fixed time offset between camera and motion sensor. It is what turns pixels and motion samples into metric measurements — for undistortion, stereo depth and visual-inertial odometry.

What your camera comes with

Camera	Calibration
Trinet Stereo, Stereo GS	Calibrated individually at the factory. The calibration is stored on the camera and embedded in every recording.
Trinet Mono	Use the reference calibration for your hardware version. A per-unit calibration is available as an add-on calibration service — contact us.

Where to find a unit's calibration

• In every recording. Recordings carry the camera's stored calibration inside the video file, so a clip is usable for undistortion even on its own. The toolkit reads it.
• From the camera. The Trinet app can read the stored calibration (Calibration → Read), and apps can use the SDK's getCalibration.
• As a file. Where we hold your units' calibrations as files, they use the same JSON format as the reference calibrations, keyed by device ID.

Cameras can also store a calibration you provide: Calibration → Upload from file in the app, with Lock calibration to prevent it being overwritten.

Reference vs per-unit calibration

The reference (batch) calibration is a representative calibration for each hardware version. Focal length, distortion, stereo baseline, camera–IMU rotation, lever arm and time offset are very similar from unit to unit; the optical centre and, on stereo cameras, the small rotation between the two eyes vary per unit.

Use the reference calibration for	Use a per-unit calibration for
Mono units without the calibration service	Metric stereo depth
Quick starts, prototyping, simulation, dataset tooling	Visual-inertial odometry / SLAM at full accuracy
Initial values for online refinement	Anything needing sub-pixel accuracy

Next: Reference calibrations · Use a calibration