Fixed threshold (cv::threshold). type picks binary/inverted/truncate/to-zero semantics; OTSU_BINARY / TRIANGLE_BINARY ignore thresh and derive the threshold automatically.

Module：OpenCV color & threshold · Task type：opencv_threshold

Ports

Inputs

PortTypeRequired
inImage / cv::Mat✓

Outputs

PortTypeRequired
outcv::Mat✓

Parameters

参数类型默认值范围 / 选项说明
threshfloat128[0, 255]
maxvalfloat255[0, 255]
typeenum0BINARY / BINARY_INV / TRUNC / TOZERO / TOZERO_INV / OTSU_BINARY / TRIANGLE_BINARY

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_threshold",
      "params": {
        "thresh": 128,
        "maxval": 255,
        "type": 0
      }
    },
    {
      "id": "save",
      "type": "opencv_image_write",
      "params": {
        "file_path": "out_out.png"
      }
    }
  ],
  "edges": [
    {
      "from": "read",
      "from_port": "out",
      "to": "node",
      "to_port": "in"
    },
    {
      "from": "node",
      "from_port": "out",
      "to": "save",
      "to_port": "in"
    }
  ]
}

Notes

  • OTSU/TRIANGLE ignore thresh; the input must be 8-bit single channel (grayscale first).

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