{
  "title": "Fields contours",
  "description": "Pixel coordinates of the contours on the image",
  "type": "object",
  "properties": {
    "objects": {
      "description": "List of the contours",
      "type": "array",
      "items": {
        "description": "Field contour",
        "type": "object",
        "properties": {
          "data": {
            "description": "List of the coordinates. First element describes exterior of the contour, next elements decribes holes in the contour",
            "type": "array"
          },
          "type": {
            "description": "Object type. To work correctly, it must be 'region'",
            "type": "string",
            "const": "region"
          }
        },
        "required": [
          "data",
          "type"
        ]
      }
    },
    "size": {
      "description": "Size of the image ([width, height])",
      "type": "array"
    }
  },
  "required": [
    "objects",
    "size"
  ]
}