I'm a freelance computer-vision developer with a PhD in human-movement science, and I build applied technology for health, physical activity and sports performance. This is the story of why I ended up writing my own multi-camera calibration tool — and why I open-sourced it.
The dependency I couldn't avoid
A lot of my client work rests on the same unglamorous first step: calibrating a rig of USB cameras. Before you can reconstruct a movement in 3D, track a joint or line up several viewpoints, every camera needs its intrinsics (focal length, lens distortion) and its extrinsics (its 6-DoF position and orientation in one shared coordinate frame). Get calibration wrong and everything downstream is wrong — so it kept coming back, project after project, as the quiet dependency I couldn't skip.
Where the existing tools rubbed
The best open-source reference I found was Caliscope. Its calibration math is
