Add a field to configure inertia per zone

docs/docs/configuration/index.md

@@ -467,6 +467,8 @@ cameras:
         # Required: List of x,y coordinates to define the polygon of the zone.
         # NOTE: Presence in a zone is evaluated only based on the bottom center of the objects bounding box.
         coordinates: 545,1077,747,939,788,805
+        # Optional: Set the inertia required for an object to be considered present in the zone. Allowed values are 0 < inertia < 10 (default: shown below)
+        inertia: 3
         # Optional: List of objects that can trigger this zone (default: all tracked objects)
         objects:
           - person

frigate/config.py

@@ -326,6 +326,12 @@ class ZoneConfig(BaseModel):
     coordinates: Union[str, List[str]] = Field(
         title="Coordinates polygon for the defined zone."
     )
+    inertia: int = Field(
+        default_factory=3,
+        title="Number of frames required for object to be considered present in the zone.",
+        gt=0,
+        le=10,
+    )
     objects: List[str] = Field(
         default_factory=list,
         title="List of objects that can trigger the zone.",

frigate/object_processing.py

@@ -151,7 +151,7 @@ class TrackedObject:
                 self.zone_presence[name] = zone_score + 1
 
                 # an object is only considered present in a zone if it has a zone inertia of 3+
-                if zone_score >= 3:
+                if zone_score >= zone.inertia:
                     # if the object passed the filters once, dont apply again
                     if name in self.current_zones or not zone_filtered(self, zone.filters):
                         current_zones.append(name)
@@ -159,7 +159,7 @@ class TrackedObject:
                             self.entered_zones.append(name)
             else:
                 # once an object has a zone inertia of 3+ it is not checked anymore
-                if 0 < zone_score < 3:
+                if 0 < zone_score < zone.inertia:
                     self.zone_presence[name] = zone_score - 1
 
         if not self.false_positive: