We measure
what the eye
cannot

A French CV/ML lab turning human motion into measurements you can defend. First deployment in rhythmic gymnastics — the same instrument applies wherever a defendable number outweighs an opinion.

Calibrated motion measurement, in 3D
Fig.Reprojection overlayAIST++ · 4-cam
How it works

Many cameras in,
one motion out

Synchronised camera views fuse into a single calibrated 3D skeleton. The output is recoverable from any angle - the centre clip here is such reconstruction, with the virtual camera rotating around it.

Cam A · 0°
3D Reconstruction
Cam B · 90°
Fig. Raw views from the AIST++ Dance Motion Dataset (Li et al., 2021, CC BY 4.0). 3D reconstruction produced by our calibration and triangulation pipeline.
On method

Calibrated.
Not magic

Multi-view geometry is a sixty-year-old discipline. We use it correctly — known baselines, DLT triangulation, reprojection-error gating, audit-trail outputs.

  • Linear DLTN-view triangulation, confidence-gated
  • Pinhole-from-geometryMultiple source capture · chessboard planned
22mmMPJPE
100%Triangulation rate
4–8camPer rig
LiDAROptional modules
On validation

15 mm of mean
joint error

Four cameras around a dance sequence on the public AIST++ benchmark — no gymnast, no worker, no domain-specific tuning. The geometry is sport-agnostic by construction, and every number is reproducible end-to-end from the same artefacts our pipeline writes.

20 mm — review threshold
noseeye·leye·rear·lear·rshldr·lshldr·relb·lelb·rwrst·lwrst·rhip·lhip·rknee·lknee·rankl·lankl·r
Fig. Per-joint reprojection error across the AIST++ validation clip.Linear DLT · stock COCO-17 pose · no biomechanics tuning
First vertical
ARGRASS

Judging-assist for rhythmic gymnastics

Two cameras for training-grade capture in clubs and academies; scale to four or more with an optional LiDAR module for competition-grade precision and apparatus-touch detection. Every metric ships with a confidence interval and the frame range a judge can replay.

Starter

Training-grade

2 × camera · 1 × laptop · training-grade
  • Cloud reconstruction
  • Coach review UI
  • 60 fps capture
  • Cross-platform export
For clubs and academies
Competition-readyRecommended

Federation-grade

4–8 × camera · LiDAR module · competition-grade
  • Optional LiDAR module · LIFeLiDAR SAS
  • Judge review UI
  • Audit trail · signed export
  • Apparatus-touch detection
For federations and events
Our vision

Gymnastics is
where we start

The same calibrated stack measures any motion worth measuring. The geometry does not care whether you put a gymnast, a worker, or an inspector in front of it.

Rhythmic
gymnastics
Live · Shipping pilot

Calibrated multi-camera judging-assist. Per-frame 3D measurements with confidence intervals — pivot rotations, body deviation, apparatus throw height, catch accuracy. The judging panel keeps every call; ambiguous frames flag for review. Three pilots open across France through the 2026 season — the first room where the instrument earns its trust.

Meet ARGRASS →
Other possibilities · in scope
  • Occupational ergonomics
  • Protocol compliance
  • Healthcare procedures
  • Other sports
  • Industrial maintenance