Affine warp (cv::warpAffine). The matrix is a six-number string (row-major, e.g. translation 1,0,20;0,1,10); anything that preserves parallel lines can be expressed.

Module：OpenCV geometry · Task type：opencv_warp_affine

Ports

Inputs

PortTypeRequired
inImage / cv::Mat✓

Outputs

PortTypeRequired
outcv::Mat✓

Parameters

参数类型默认值范围 / 选项说明
anglefloat0[-360, 360]
scalefloat1[0.01, 32]
center_xfloat-1[-1, 8192]
center_yfloat-1[-1, 8192]
output_widthint0[0, 8192]
output_heightint0[0, 8192]
interpolationenum1LINEAR / NEAREST / CUBIC / LANCZOS4interpolation method
border_modeenum0CONSTANT / REPLICATE / REFLECT / REFLECT_101 / WRAP

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_warp_affine",
      "params": {
        "angle": 0,
        "scale": 1,
        "center_x": -1,
        "center_y": -1,
        "output_width": 0,
        "output_height": 0,
        "interpolation": 1,
        "border_mode": 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"
    }
  ]
}

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