{
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    "coordinate_frame": "calibration_canonical_metric_mm",
    "distance": "exact Euclidean nearest-neighbour via scipy.spatial.cKDTree",
    "primary_cad_sampling": {
      "method": "triangle-area-uniform barycentric sampling with numpy PCG64",
      "sample_count": 100000,
      "seed": 20260811
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    "registration_performed_by_aggregator": false,
    "representation_policy": "Phone rows sample reconstructed triangle surfaces; the Helios row retains its measured canonical points. This is a capture-pipeline comparison, not a sensor-only or representation-identical ranking.",
    "same_reference_cad": true,
    "similarity_rescaling_by_aggregator": false,
    "transform_applied_by_aggregator": "identity"
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          "mean_mm": 1.54653,
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      "registration_provenance": {
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        "icp_scale_policy": "fixed metric scale; rotation and translation only",
        "method": "proper rigid PCA/trimmed-ICP with dynamic known-target prism",
        "metric_scale_basis": "known-target consistency; scale held at exactly 0.001 m/mm",
        "metric_scale_verified": true,
        "proper_rotation_determinant": 1.0000000092937067,
        "rotation_orthogonality_max_abs_error": 8.668075812678921e-09,
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        "uses_reflection": false,
        "whole_target_icp": true
      },
      "representation": "canonical_measured_point_cloud",
      "representation_sample_count": 16274
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  ],
  "limitations": [
    "Phone metrics represent reconstructed mesh surfaces, while Helios metrics represent retained measured points.",
    "Helios registration includes fixed-scale whole-target rigid ICP; all phone registrations use direct four-target-tag metric-rigid recovery without whole-target ICP or fitted scale.",
    "All results include print, assembly, capture, reconstruction, registration, and finite-sampling effects."
  ],
  "publication_safety": {
    "absolute_input_paths_included": false,
    "artifact_identity": "basename, byte count, and SHA-256 only"
  },
  "schema": "org.iphonotype.helios-phone-surface-comparison/v1",
  "source_reports": {
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      "bytes": 25736,
      "sha256": "6c5eac5c39d7c5c13a653f0a438fd4ec87a76c524c6f12f262b734f81c37e5bb"
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      "bytes": 964,
      "sha256": "2bdef361a2b0183f3c3b5dde6a0a6b5e2f709e99936b95376e1db7e9dbb7dedf"
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    "phone_comparison": {
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      "bytes": 26992,
      "sha256": "2098a8f9758780a7a444e19a2c5990dedeea1a42b4216c82cb1a4e95f2f023d6"
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  "status": "complete",
  "tool": {
    "name": "aggregate_helios_phone_surface_comparison.py",
    "version": "1.0.0"
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}