metadata/class_definitions.json

{
  "class_definitions": {
    "background": {
      "class_id": 0,
      "pixel_value": 0,
      "name": "background",
      "description": "Background regions without methane plumes, including ice block and ambient environment",
      "color_rgb": [0, 0, 0]
    },
    "control_diet": {
      "class_id": 1,
      "pixel_value": 1,
      "name": "control_diet",
      "description": "Methane plumes from control diet (50:50 forage to concentrate ratio)",
      "gc_range_ppm": "166-171",
      "diet_composition": {
        "forage_percentage": 50,
        "concentrate_percentage": 50,
        "description": "Standard dairy cow diet with balanced forage to concentrate ratio"
      },
      "color_rgb": [255, 0, 0]
    },
    "low_forage_diet": {
      "class_id": 2,
      "pixel_value": 3,
      "name": "low_forage_diet", 
      "description": "Methane plumes from low forage diet (20:80 forage to concentrate ratio)",
      "gc_range_ppm": "300-334",
      "diet_composition": {
        "forage_percentage": 20,
        "concentrate_percentage": 80,
        "description": "High-concentrate diet with reduced forage content"
      },
      "color_rgb": [0, 255, 0]
    },
    "high_forage_diet": {
      "class_id": 3,
      "pixel_value": 2,
      "name": "high_forage_diet",
      "description": "Methane plumes from high forage diet (80:20 forage to concentrate ratio)", 
      "gc_range_ppm": "457-510",
      "diet_composition": {
        "forage_percentage": 80,
        "concentrate_percentage": 20,
        "description": "High-forage diet with minimal concentrate supplementation"
      },
      "color_rgb": [0, 0, 255]
    }
  },
  "excluded_classes": {
    "control_bromoform": {
      "description": "Control diet with bromoform addition (0.14 mg/L)",
      "gc_range_ppm": "~1.41",
      "exclusion_reason": "Methane concentration below OGI camera detection limit due to bromoform inhibition"
    }
  },
  "class_mapping": {
    "0": "background",
    "1": "control_diet", 
    "2": "low_forage_diet",
    "3": "high_forage_diet"
  },
  "pixel_to_class_mapping": {
    "0": 0,
    "1": 1,
    "2": 3,
    "3": 2
  },
  "total_classes": 4,
  "annotation_format": "Binary masks with pixel values 0-3 corresponding to class IDs",
  "validation_method": "Gas Chromatography (GC) concentration measurements",
  "notes": {
    "concentration_correlation": "Class assignments based on measured GC concentration ranges from corresponding dietary treatments",
    "mask_generation": "Automated pipeline with background subtraction, thresholding, and watershed segmentation",
    "quality_assurance": "Manual verification of automated mask generation results",
    "pixel_value_discrepancy": "Class IDs follow paper numbering (Class 2=Low Forage, Class 3=High Forage), but pixel values in masks are swapped (Low Forage=3, High Forage=2). Dataset loader handles this conversion automatically."
  }
}