Min face configuration option (#18284)

* Add option to specify minimum face attempts for an object

* Set upper bound

frigate/config/classification.py

@@ -80,6 +80,12 @@ class FaceRecognitionConfig(FrigateBaseModel):
     min_area: int = Field(
         default=750, title="Min area of face box to consider running face recognition."
     )
+    min_faces: int = Field(
+        default=1,
+        gt=0,
+        le=6,
+        title="Min face attempts for the sub label to be applied to the person object.",
+    )
     save_attempts: int = Field(
         default=100, ge=0, title="Number of face attempts to save in the train tab."
     )

frigate/data_processing/real_time/face.py

@@ -302,6 +302,9 @@ class FaceRealTimeProcessor(RealTimeProcessorApi):
             self.person_face_history[id]
         )
 
+        if len(self.person_face_history[id]) < self.face_config.min_faces:
+            weighted_sub_label = "unknown"
+
         self.requestor.send_data(
             "tracked_object_update",
             json.dumps(