Connected-component analysis (cv::connectedComponents). 8- or 4-connectivity; outputs a per-pixel integer label map. Combine with statistics for counting and small-area noise removal.

Module：OpenCV segmentation · Task type：opencv_connected_components

Ports

Inputs

PortTypeRequired
inImage / cv::Mat✓

Outputs

PortTypeRequired
labelsImage / cv::Mat—
num_labelsImage / cv::Mat—

Parameters

参数类型默认值范围 / 选项说明
connectivityenum8C8 / C48 or 4

Example graph

A minimal runnable pipeline (read → process → write). Drag it into GraphStudio or open via --open; replace data/test.png with a real path.

{
  "version": "2.0",
  "tasks": [
    {
      "id": "read",
      "type": "opencv_image_read",
      "params": {
        "file_path": "data/test.png"
      }
    },
    {
      "id": "node",
      "type": "opencv_connected_components",
      "params": {
        "connectivity": 8
      }
    },
    {
      "id": "save1",
      "type": "opencv_image_write",
      "params": {
        "file_path": "out_labels.png"
      }
    },
    {
      "id": "save2",
      "type": "opencv_image_write",
      "params": {
        "file_path": "out_num_labels.png"
      }
    }
  ],
  "edges": [
    {
      "from": "read",
      "from_port": "out",
      "to": "node",
      "to_port": "in"
    },
    {
      "from": "node",
      "from_port": "labels",
      "to": "save1",
      "to_port": "in"
    },
    {
      "from": "node",
      "from_port": "num_labels",
      "to": "save2",
      "to_port": "in"
    }
  ]
}

Part of the GraphStudio node guide series; parameters reflect the latest release.