{
  "id": "feedback-highlight-accumulator",
  "name": "Feedback Background Memory",
  "description": "Learns a persistent per-pixel background plate in shader-local feedback and compares the live frame against that evolving full-frame state.",
  "category": "Feedback",
  "entryPoint": "updateBackgroundModel",
  "passes": [
    {
      "id": "background",
      "source": "shader.slang",
      "entryPoint": "updateBackgroundModel",
      "output": "backgroundModel"
    },
    {
      "id": "display",
      "source": "shader.slang",
      "entryPoint": "displayBackgroundDifference",
      "inputs": [
        "backgroundModel"
      ],
      "output": "layerOutput"
    }
  ],
  "feedback": {
    "enabled": true,
    "writePass": "background"
  },
  "parameters": [
    {
      "id": "learnRate",
      "label": "Learn Rate",
      "type": "float",
      "default": 0.03,
      "min": 0.001,
      "max": 0.5,
      "step": 0.001,
      "description": "How quickly the stored background model adapts toward the current frame."
    },
    {
      "id": "differenceThreshold",
      "label": "Difference Threshold",
      "type": "float",
      "default": 0.12,
      "min": 0.001,
      "max": 1.0,
      "step": 0.001,
      "description": "Minimum difference between the live frame and stored background before the overlay becomes visible."
    },
    {
      "id": "softness",
      "label": "Threshold Softness",
      "type": "float",
      "default": 0.08,
      "min": 0.001,
      "max": 0.5,
      "step": 0.001,
      "description": "Softens the transition around the difference threshold."
    },
    {
      "id": "overlayOpacity",
      "label": "Overlay Opacity",
      "type": "float",
      "default": 0.85,
      "min": 0.0,
      "max": 1.0,
      "step": 0.01,
      "description": "Strength of the motion/difference overlay on top of the live image."
    },
    {
      "id": "backgroundMix",
      "label": "Background Mix",
      "type": "float",
      "default": 0.15,
      "min": 0.0,
      "max": 1.0,
      "step": 0.01,
      "description": "Amount of the learned background model shown underneath the live source."
    },
    {
      "id": "overlayTint",
      "label": "Overlay Tint",
      "type": "color",
      "default": [
        1.0,
        0.45,
        0.08,
        1.0
      ],
      "min": [
        0.0,
        0.0,
        0.0,
        0.0
      ],
      "max": [
        1.0,
        1.0,
        1.0,
        1.0
      ],
      "step": [
        0.01,
        0.01,
        0.01,
        0.01
      ],
      "description": "Tint used for areas that differ from the learned background."
    }
  ]
}