frigate/web/public/locales/en/config/lpr.json

{
  "label": "License Plate Recognition",
  "description": "License plate recognition settings including detection thresholds, formatting, and known plates.",
  "enabled": {
    "label": "Enable LPR",
    "description": "Enable or disable LPR globally; camera-level settings can override."
  },
  "model_size": {
    "label": "Model size",
    "description": "Model size used for text detection/recognition; small runs on CPU, large on GPU."
  },
  "detection_threshold": {
    "label": "Detection threshold",
    "description": "Detection confidence threshold to begin running OCR on a suspected plate."
  },
  "min_area": {
    "label": "Minimum plate area",
    "description": "Minimum plate area (pixels) required to attempt recognition."
  },
  "recognition_threshold": {
    "label": "Recognition threshold",
    "description": "Confidence threshold required for recognized plate text to be attached as a sub-label."
  },
  "min_plate_length": {
    "label": "Min plate length",
    "description": "Minimum number of characters a recognized plate must contain to be considered valid."
  },
  "format": {
    "label": "Plate format regex",
    "description": "Optional regex to validate recognized plate strings against an expected format."
  },
  "match_distance": {
    "label": "Match distance",
    "description": "Number of character mismatches allowed when comparing detected plates to known plates."
  },
  "known_plates": {
    "label": "Known plates",
    "description": "List of plates or regexes to specially track or alert on."
  },
  "enhancement": {
    "label": "Enhancement level",
    "description": "Enhancement level (0-10) to apply to plate crops prior to OCR; higher values may not always improve results, levels above 5 may only work with night time plates and should be used with caution."
  },
  "debug_save_plates": {
    "label": "Save debug plates",
    "description": "Save plate crop images for debugging LPR performance."
  },
  "device": {
    "label": "Device",
    "description": "This is an override, to target a specific device. See https://onnxruntime.ai/docs/execution-providers/ for more information"
  },
  "replace_rules": {
    "label": "Replacement rules",
    "description": "Regex replacement rules used to normalize detected plate strings before matching.",
    "pattern": {
      "label": "Regex pattern"
    },
    "replacement": {
      "label": "Replacement string"
    }
  },
  "expire_time": {
    "label": "Expire seconds",
    "description": "Time in seconds after which an unseen plate is expired from the tracker (for dedicated LPR cameras only)."
  }
}