GPU alpha composite: in (alpha-carrying foreground) over in2 (background). Feeds matting/cutout RGBA straight into the final composition.

Module：GPU image processing · Task type：gpu_alpha_composite

Ports

Inputs

PortTypeRequired
inImage / cv::Mat✓
in2Image / cv::Mat✓

Outputs

PortTypeRequired
outtask_graph::Image✓

Parameters

参数类型默认值范围 / 选项说明

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": "read1",
      "type": "opencv_image_read",
      "params": {
        "file_path": "data/test.png"
      }
    },
    {
      "id": "read2",
      "type": "opencv_image_read",
      "params": {
        "file_path": "data/test.png"
      }
    },
    {
      "id": "node",
      "type": "gpu_alpha_composite",
      "params": {}
    },
    {
      "id": "save",
      "type": "opencv_image_write",
      "params": {
        "file_path": "out_out.png"
      }
    }
  ],
  "edges": [
    {
      "from": "read1",
      "from_port": "out",
      "to": "node",
      "to_port": "in"
    },
    {
      "from": "read2",
      "from_port": "out",
      "to": "node",
      "to_port": "in2"
    },
    {
      "from": "node",
      "from_port": "out",
      "to": "save",
      "to_port": "in"
    }
  ]
}

Notes

  • in2 must be 3-channel (BGR); both inputs must match in size.
  • Get 4-channel input via opencv_image_read keep_alpha or matting’s cutout output.

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