{
  "schemaVersion": 1,
  "session": "2025-09-01 Harris Hill CCW \u2014 original JPEGs",
  "annotationProvenance": "Source-only garment landmark estimates by Codex on 2026-09-14 before detector inspection of these 2025 photos; not independent human ground truth. Points under riding gear have 25-pixel uncertainty. Hidden opposite-side anatomy not annotated. Previous 2026 results have been seen. No normalized torso-scale accuracy claim.",
  "pairs": [
    {
      "id": "H01",
      "file": "103310013-R52B8972.JPG",
      "riders": [
        {
          "role": "subject",
          "rider": "James",
          "panel": {
            "x": 0,
            "y": 0,
            "width": 2048,
            "height": 1366
          },
          "crop": {
            "x": 800,
            "y": 250,
            "width": 530,
            "height": 550
          },
          "annotations": [
            {
              "name": "left_shoulder",
              "point": {
                "x": 1078,
                "y": 463
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "left_elbow",
              "point": {
                "x": 1070,
                "y": 587
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "left_wrist",
              "point": {
                "x": 934,
                "y": 576
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "left_knee",
              "point": {
                "x": 1095,
                "y": 668
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "left_ankle",
              "point": {
                "x": 1142,
                "y": 754
              },
              "uncertaintyPixels": 25
            }
          ],
          "torsoLength": null,
          "annotationNote": "Source-only provisional visible garment landmarks; other joints unassessed. Select white-helmet silver-bike rider. No reference supplied for this track day."
        }
      ]
    },
    {
      "id": "H02",
      "file": "103310014-R52A0575.JPG",
      "riders": [
        {
          "role": "subject",
          "rider": "James",
          "panel": {
            "x": 0,
            "y": 0,
            "width": 2048,
            "height": 1365
          },
          "crop": {
            "x": 530,
            "y": 275,
            "width": 830,
            "height": 700
          },
          "annotations": [
            {
              "name": "left_elbow",
              "point": {
                "x": 1269,
                "y": 763
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "left_knee",
              "point": {
                "x": 1165,
                "y": 896
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "right_elbow",
              "point": {
                "x": 915,
                "y": 443
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "right_knee",
              "point": {
                "x": 800,
                "y": 524
              },
              "uncertaintyPixels": 25
            }
          ],
          "torsoLength": null,
          "annotationNote": "Source-only provisional visible garment landmarks; other joints unassessed. Select white-helmet silver-bike rider. No reference supplied for this track day."
        }
      ]
    },
    {
      "id": "H03",
      "file": "103310015-R52B0380.JPG",
      "riders": [
        {
          "role": "subject",
          "rider": "James",
          "panel": {
            "x": 0,
            "y": 0,
            "width": 2048,
            "height": 1366
          },
          "crop": {
            "x": 395,
            "y": 230,
            "width": 675,
            "height": 735
          },
          "annotations": [
            {
              "name": "right_shoulder",
              "point": {
                "x": 468,
                "y": 525
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "right_elbow",
              "point": {
                "x": 529,
                "y": 670
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "right_wrist",
              "point": {
                "x": 667,
                "y": 650
              },
              "uncertaintyPixels": 25
            },
            {
              "name": "right_knee",
              "point": {
                "x": 515,
                "y": 843
              },
              "uncertaintyPixels": 25
            }
          ],
          "torsoLength": null,
          "annotationNote": "Source-only provisional visible garment landmarks; other joints unassessed. Select white-helmet silver-bike rider. No reference supplied for this track day."
        }
      ]
    }
  ]
}