lpr dynamic config

frigate/data_processing/post/license_plate.py

@@ -12,6 +12,7 @@ from frigate.comms.embeddings_updater import EmbeddingsRequestEnum
 from frigate.comms.event_metadata_updater import EventMetadataPublisher
 from frigate.comms.inter_process import InterProcessRequestor
 from frigate.config import FrigateConfig
+from frigate.config.classification import LicensePlateRecognitionConfig
 from frigate.data_processing.common.license_plate.mixin import (
     WRITE_DEBUG_IMAGES,
     LicensePlateProcessingMixin,
@@ -47,6 +48,11 @@ class LicensePlatePostProcessor(LicensePlateProcessingMixin, PostProcessorApi):
         self.sub_label_publisher = sub_label_publisher
         super().__init__(config, metrics, model_runner)
 
+    def update_config(self, lpr_config: LicensePlateRecognitionConfig) -> None:
+        """Update LPR config at runtime."""
+        self.lpr_config = lpr_config
+        logger.debug("LPR config updated dynamically")
+
     def process_data(
         self, data: dict[str, Any], data_type: PostProcessDataEnum
     ) -> None:

frigate/data_processing/real_time/license_plate.py

@@ -8,6 +8,7 @@ import numpy as np
 from frigate.comms.event_metadata_updater import EventMetadataPublisher
 from frigate.comms.inter_process import InterProcessRequestor
 from frigate.config import FrigateConfig
+from frigate.config.classification import LicensePlateRecognitionConfig
 from frigate.data_processing.common.license_plate.mixin import (
     LicensePlateProcessingMixin,
 )
@@ -40,6 +41,11 @@ class LicensePlateRealTimeProcessor(LicensePlateProcessingMixin, RealTimeProcess
         self.camera_current_cars: dict[str, list[str]] = {}
         super().__init__(config, metrics)
 
+    def update_config(self, lpr_config: LicensePlateRecognitionConfig) -> None:
+        """Update LPR config at runtime."""
+        self.lpr_config = lpr_config
+        logger.debug("LPR config updated dynamically")
+
     def process_frame(
         self,
         obj_data: dict[str, Any],

frigate/embeddings/maintainer.py

@@ -102,6 +102,7 @@ class EmbeddingMaintainer(threading.Thread):
         self.face_recognition_config_subscriber = ConfigSubscriber(
             "config/face_recognition", exact=True
         )
+        self.lpr_config_subscriber = ConfigSubscriber("config/lpr", exact=True)
 
         # Configure Frigate DB
         db = SqliteVecQueueDatabase(
@@ -277,6 +278,7 @@ class EmbeddingMaintainer(threading.Thread):
             self.config_updater.check_for_updates()
             self._check_classification_config_updates()
             self._check_face_recognition_config_updates()
+            self._check_lpr_config_updates()
             self._process_requests()
             self._process_updates()
             self._process_recordings_updates()
@@ -289,6 +291,7 @@ class EmbeddingMaintainer(threading.Thread):
         self.config_updater.stop()
         self.classification_config_subscriber.stop()
         self.face_recognition_config_subscriber.stop()
+        self.lpr_config_subscriber.stop()
         self.event_subscriber.stop()
         self.event_end_subscriber.stop()
         self.recordings_subscriber.stop()
@@ -381,6 +384,30 @@ class EmbeddingMaintainer(threading.Thread):
 
         logger.debug("Applied dynamic face recognition config update")
 
+    def _check_lpr_config_updates(self) -> None:
+        """Check for LPR config updates."""
+        topic, lpr_config = self.lpr_config_subscriber.check_for_update()
+
+        if topic is None:
+            return
+
+        previous_min_area = self.config.lpr.min_area
+        self.config.lpr = lpr_config
+
+        for camera_config in self.config.cameras.values():
+            if camera_config.lpr.min_area == previous_min_area:
+                camera_config.lpr.min_area = lpr_config.min_area
+
+        for processor in self.realtime_processors:
+            if isinstance(processor, LicensePlateRealTimeProcessor):
+                processor.update_config(lpr_config)
+
+        for processor in self.post_processors:
+            if isinstance(processor, LicensePlatePostProcessor):
+                processor.update_config(lpr_config)
+
+        logger.debug("Applied dynamic LPR config update")
+
     def _process_requests(self) -> None:
         """Process embeddings requests"""
 

web/src/components/config-form/section-configs/lpr.ts

@@ -40,21 +40,7 @@ const lpr: SectionConfigOverrides = {
       "device",
       "replace_rules",
     ],
-    restartRequired: [
-      "enabled",
-      "model_size",
-      "detection_threshold",
-      "min_area",
-      "recognition_threshold",
-      "min_plate_length",
-      "format",
-      "match_distance",
-      "known_plates",
-      "enhancement",
-      "debug_save_plates",
-      "device",
-      "replace_rules",
-    ],
+    restartRequired: ["model_size", "enhancement", "device"],
     uiSchema: {
       format: {
         "ui:options": { size: "md" },