# What do open papers measure for monocular and few-camera markerless capture against reference systems, what is the evidence for commercial tools such as Move AI, and what does it imply for animation production use?

- id: art_01M5MTYZ9JFSH9AJHG6N54JE3C
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T07, T11, T20 · tags: none
- updated: 2026-10-23T16:54:30.957Z
- url: https://veyrul.com/articles/art_01M5MTYZ9JFSH9AJHG6N54JE3C

Open results are research-method numbers, not commercial-tool numbers: on Human3.6M (marker-based) a monocular lifting model reports 46.8 mm MPJPE from detected 2D keypoints (37.2 mm from ground-truth 2D); on in-the-wild 3DPW WHAM reports 57.8 mm; on EMDB global trajectories WHAM reports 354.8 mm W-MPJPE100, 6.0 % root-translation error and 4.4 mm foot sliding. A 2022 clinical review gives 40-60 mm joint-centre differences and up to 30 degree ankle-angle differences for monocular methods, and OpenCap (two or more phones) reports 4.5 degree joint-angle MAE against skin-marker capture, with the authors noting that skin-marker error itself limits what can be shown. No open independent validation of Move AI or Flow Studio mocap against marker-based ground truth was found (bounded Europe PMC search), and Move's own accuracy page gives no numbers. Implication (synthesis): treat markerless output as animation reference or blocking requiring cleanup of root drift and foot contact, not as ma...

Open results are research-method numbers, not commercial-tool numbers: on Human3.6M (marker-based) a monocular lifting model reports 46.8 mm MPJPE from detected 2D keypoints (37.2 mm from ground-truth 2D); on in-the-wild 3DPW WHAM reports 57.8 mm; on EMDB global trajectories WHAM reports 354.8 mm W-MPJPE100, 6.0 % root-translation error and 4.4 mm foot sliding. A 2022 clinical review gives 40-60 mm joint-centre differences and up to 30 degree ankle-angle differences for monocular methods, and OpenCap (two or more phones) reports 4.5 degree joint-angle MAE against skin-marker capture, with the authors noting that skin-marker error itself limits what can be shown. No open independent validation of Move AI or Flow Studio mocap against marker-based ground truth was found (bounded Europe PMC search), and Move's own accuracy page gives no numbers. Implication (synthesis): treat markerless output as animation reference or blocking requiring cleanup of root drift and foot contact, not as marker-equivalent data.

Curator qualifications: All excerpts located; WHAM 57.8 mm (3DPW) vs 46.8 mm (Human3.6M) not comparable - kept.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://arxiv.org/pdf/1811.11742v2",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://arxiv.org/pdf/2312.07531v2",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC8884063/",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC10586693/",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://move.ai/accuracy",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://www.ebi.ac.uk/europepmc/webservices/rest/search?query=%22Move%20AI%22%20markerless&format=json&pageSize=10&resultType=lite",
      "note": "candidate evidence excerpts"
    },
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC13511503/",
      "note": "candidate evidence excerpts"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Open results are research-method numbers, not commercial-tool numbers: on Human3.6M (marker-based) a monocular lifting model reports 46.8 mm MPJPE from detected 2D keypoints (37.2 mm from ground-truth 2D); on in-the-wild 3DPW WHAM reports 57.8 mm; on EMDB global trajectories WHAM reports 354.8 mm W-MPJPE100, 6.0 % root-translation error and 4.4 mm foot sliding. A 2022 clinical review gives 40-60 mm joint-centre differences and up to 30 degree ankle-angle differences for monocular methods, and OpenCap (two or more phones) reports 4.5 degree joint-angle MAE against skin-marker capture, with the authors noting that skin-marker error itself limits what can be shown. No open independent validation of Move AI or Flow Studio mocap against marker-based ground truth was found (bounded Europe PMC search), and Move's own accuracy page gives no numbers. Implication (synthesis): treat markerless output as animation reference or blocking requiring cleanup of root drift and foot contact, not as marker-equivalent data. · locator: candidate evidence excerpts · source: https://arxiv.org/pdf/1811.11742v2

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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