# Ground-Truth Accuracy Report ## Hollywood Reborn Parametric Extraction Pipeline **Generated:** January 2026 **Total Frames Analyzed:** 153,451 **Characters:** 2 (Male + Female base characters) --- ## Executive Summary This report provides transparent metrics about our parametric extraction pipeline. We believe in honest reporting: these are measurements against our own extraction, not validated against 3D ground truth. ### What We Measure - **Head Pose (4D):** Joystick-style rotation parameters - **Eye Gaze (4D):** Horizontal/vertical gaze direction + blink - **Mouth State:** Opening amount and expression modifiers ### What This Report Shows 1. Distribution statistics for each parameter 2. Parameter correlation (decoupling validation) 3. Coverage across the parametric manifold --- ## Parameter Distribution Statistics | Parameter | Count | Mean | Std Dev | Min | P5 | P50 | P95 | Max | |-----------|-------|------|---------|-----|-----|-----|-----|-----| | head_jx | 153,451 | -0.2359 | 0.5313 | -1.5055 | -1.1370 | -0.2996 | 0.6924 | 1.5906 | | head_jy | 153,451 | 0.0541 | 0.2078 | -1.0467 | -0.3080 | 0.0674 | 0.3741 | 0.9100 | | eye_jx | 153,451 | 0.0232 | 0.3629 | -2.6258 | -0.3132 | -0.0719 | 0.8859 | 3.0470 | | eye_jy | 153,451 | 0.1893 | 0.1807 | -1.2788 | -0.1010 | 0.1832 | 0.5002 | 1.4230 | | eye_blink | 153,451 | 0.0832 | 0.0660 | 0.0001 | 0.0051 | 0.0696 | 0.2103 | 0.3998 | | mouth | 153,451 | 0.0398 | 0.0963 | 0.0000 | 0.0000 | 0.0052 | 0.2471 | 0.8900 | | mouth_expr | 153,451 | 0.0298 | 0.1338 | -0.7107 | -0.0073 | 0.0000 | 0.2144 | 0.9673 | --- ## Parameter Decoupling Analysis A key claim of our system is that head pose, gaze, and expression are **decoupled**— you can adjust one without affecting others. The correlation matrix below validates this:  ### Interpretation - **Low correlation (near 0)** between head and eye parameters confirms decoupling - **head_jx vs eye_jx correlation:** -0.327 (should be low if decoupled) - **head_jy vs eye_jy correlation:** 0.580 (should be low if decoupled) --- ## Parametric Coverage Our index provides dense coverage across the parametric manifold:   --- ## Methodology & Limitations ### Extraction Pipeline Our extraction uses: - **MediaPipe Face Landmarker** for facial geometry detection - **Custom joystick mapping** from 3D rotation to 2D control surface - **ARKit-compatible blendshape** extraction for expressions ### Known Limitations 1. **No 3D Ground Truth:** Our precision claims are relative to our own extraction, not validated against motion capture or 3D scans. 2. **Anime Domain:** Extraction is tuned for anime-style characters. Real-photo performance may differ. 3. **Perspective Effects:** Extreme head rotations (>45°) have lower confidence due to self-occlusion. ### Precision Context When we claim "±0.5° precision," this means: - Queries return frames whose **extracted parameters** match within ±0.5° - The extraction itself has error margins (~2-5° typical for 2D→3D estimation) - **Relative precision** between frames is high; **absolute precision** depends on extraction quality --- ## Reproducibility Guarantee Our system provides **100% query reproducibility**: - Same query → same results, every time - Deterministic retrieval (not statistical sampling) - No model inference randomness This is the core value proposition: selection over generation. --- ## Files Generated - `parameter_distributions.png` - Histograms for each parameter - `correlation_matrix.png` - Parameter decoupling validation - `joystick_coverage.png` - 2D coverage visualization - `ACCURACY_REPORT.md` - This report --- *Hollywood Reborn Research · January 2026*Back to validation →
Supporting report · January 2026
Accuracy Report
Original research record. Historical measurements retain their original scope and limitations.