Objects Filter

This layer (objects_filter) deletes annotations less (or greater) than specified size or percentage of image area.

Settings

• filter_by

  • polygon_sizes
    • filtering_classes (type: array of classes)
    • area_size one of
      • percent (type: number)
      • size:
        • width (type: number)
        • height (type: number)
    • comparator (type: enum ["less", "greater"])
    • action (type: enum ["delete"])

  or

  • names (type: array of classes)

Case: names

{
  "action": "objects_filter",
  "src": ["$sample1"],
  "dst": "$sample2",
  "settings": {
    "filter_by": {
      "names": ["Class A", "Class C"]
    }
  }
}

Delete annotations of classes which not present in names.

Case: area percent

{
  "action": "objects_filter",
  "src": ["$sample1"],
  "dst": "$sample2",
  "settings": {
    "filter_by": {
      "polygon_sizes": {
        "filtering_classes": ["person"],
        "area_size": {
          "percent": 5
        },
        "action": "delete",
        "comparator": "less"
      }
    }
  }
}

Delete annotations of classes from filtering_classes that have area (in percentage of image area) less than specified value of area_size.

Use comparator = greater to delete annotations which area is greater than defined.

Case: bounding box size

{
  "action": "objects_filter",
  "src": ["$sample1"],
  "dst": "$sample2",
  "settings": {
    "filter_by": {
      "polygon_sizes": {
        "filtering_classes": ["person"],
        "area_size": {
          "width": 10,
          "height": 40
        },
        "action": "delete",
        "comparator": "less"
      }
    }
  }
}

Delete annotations of classes from filtering_classes that have some side (determined by the annotation bounding box) less than specified value of width or height correspondingly.

Use comparator = greater to delete annotations which some side is greater than defined.

Example

Remove annotations of class bus that are smaller than 10% of image area.

[
  {
    "dst": "$data",
    "src": [
      "mini_pascal/*"
    ],
    "action": "data",
    "settings": {
      "classes_mapping": "default"
    }
  },
  {
    "action": "objects_filter",
    "src": ["$data"],
    "dst": "$output",
    "settings": {
      "filter_by": {
        "polygon_sizes": {
          "filtering_classes": ["bus"],
          "area_size": {
            "percent": 10
          },
          "action": "delete",
          "comparator": "less"
        }
      }
    }
  },
  {
    "dst": "example_filter",
    "src": [
      "$output"
    ],
    "action": "supervisely",
    "settings": {}
  }
]