---
license: apache-2.0
tags: [onnx, mediapipe, face-detection, blazeface, qtmesheditor]
---

# BlazeFace short-range face detector (ONNX)

Google MediaPipe's BlazeFace short-range detector, from the Face Landmarker
`.task` bundle, converted to ONNX.

- **Input** `input` `[1,128,128,3]` RGB, normalized to `[-1,1]`, keep-aspect
  letterboxed (zero border).
- **Outputs** `regressors` `[1,896,16]` (box + 6 keypoints per anchor),
  `classificators` `[1,896,1]` (score logits). SSD anchors: strides
  `[8,16,16,16]`, min/max scale 0.1484375/0.75 → 896 anchors; decode + weighted
  NMS at IoU 0.3.
- Feeds the face ROI (rotation from the eye keypoints, 1.5× square-long) to the
  Face Mesh landmark model.

## License

Apache-2.0 — this graph is a direct ONNX conversion of a Google
[MediaPipe](https://developers.google.com/mediapipe) model (Apache-2.0 code
AND weights). Conversion + numerical-parity proof (vs the Python `mediapipe`
reference): [`scripts/export-facecap-onnx.py`](https://github.com/fernandotonon/QtMeshEditor/blob/master/scripts/export-facecap-onnx.py),
contract in [`docs/MOCAP_SPIKE.md`](https://github.com/fernandotonon/QtMeshEditor/blob/master/docs/MOCAP_SPIKE.md).

## How it is used

Mirror of one graph from [`fernandotonon/QtMeshEditor-models`](https://huggingface.co/fernandotonon/QtMeshEditor-models)
(`mocap/…`), which [QtMeshEditor](https://github.com/fernandotonon/QtMeshEditor)
downloads on first use for its **Performance Capture** feature (video/webcam →
facial morph + head + full-body skeletal animation, epic #869). This standalone
repo is for discoverability; the app fetches from the aggregate repo.