{
  "coordinate_systems": {
    "pdf": {
      "width_points": 612,
      "height_points": 792,
      "origin": "top-left"
    },
    "omr_template": {
      "width_pixels": 1700,
      "height_pixels": 2200,
      "origin": "marker-center crop top-left"
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  },
  "registration_markers": {
    "pdf_top_origin_centers": [
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        39
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      [
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        39
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      [
        39,
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      [
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        753
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    ],
    "outer_radius_points": 12
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    "bubble_centers_y_points": [
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    "bubble_radius_points": 7.0,
    "writing_boxes": [
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        "center_x": 455.0,
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        "width": 24
      },
      {
        "center_x": 497.0,
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      {
        "center_x": 531.0,
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      }
    ],
    "prefill": {
      "text_center_top_y_points": 54.0,
      "recommended_font": "DejaVu Sans",
      "recommended_font_size_points": 12,
      "bubble_fill_radius_points": 5.5
    }
  },
  "control_marks": {
    "purpose": [
      "orientation",
      "registration quality",
      "contrast/mark-readability check"
    ],
    "bubble_radius_points": 7.0,
    "row_gap_points": 16,
    "stations": {
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        "center_x": 52.0,
        "first_center_y": 170.0,
        "pattern": [
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        ],
        "pdf_top_origin_centers": [
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        ],
        "template_pixel_centers": [
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          [
            41,
            453
          ],
          [
            41,
            502
          ]
        ]
      },
      "upper_right": {
        "center_x": 560.0,
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        "pattern": [
          1,
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        ],
        "pdf_top_origin_centers": [
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        ],
        "template_pixel_centers": [
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          [
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          [
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        ]
      },
      "lower_left": {
        "center_x": 52.0,
        "first_center_y": 650.0,
        "pattern": [
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        ],
        "pdf_top_origin_centers": [
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          ],
          [
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          [
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        ],
        "template_pixel_centers": [
          [
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          ],
          [
            41,
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          [
            41,
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        ]
      },
      "lower_right": {
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        ],
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        ]
      }
    },
    "acceptance_rule": "All four normalized three-bit patterns must match after orientation correction; otherwise flag for review or rescan."
  }
}