allow specific objects to be listed for a zone (fixes #1123)

docs/docs/configuration/cameras.md

@@ -93,6 +93,9 @@ zones:
     # Required: List of x,y coordinates to define the polygon of the zone.
     # NOTE: Coordinates can be generated at https://www.image-map.net/
     coordinates: 545,1077,747,939,788,805
+    # Optional: List of objects that can trigger this zone (default: all tracked objects)
+    objects:
+      - person
     # Optional: Zone level object filters.
     # NOTE: The global and camera filters are applied upstream.
     filters:
@@ -312,6 +315,9 @@ cameras:
         # Required: List of x,y coordinates to define the polygon of the zone.
         # NOTE: Coordinates can be generated at https://www.image-map.net/
         coordinates: 545,1077,747,939,788,805
+        # Optional: List of objects that can trigger this zone (default: all tracked objects)
+        objects:
+          - person
         # Optional: Zone level object filters.
         # NOTE: The global and camera filters are applied upstream.
         filters:

frigate/config.py

@@ -185,6 +185,10 @@ class ZoneConfig(BaseModel):
     coordinates: Union[str, List[str]] = Field(
         title="Coordinates polygon for the defined zone."
     )
+    objects: List[str] = Field(
+        default_factory=list,
+        title="List of objects that can trigger the zone.",
+    )
     _color: Optional[Tuple[int, int, int]] = PrivateAttr()
     _contour: np.ndarray = PrivateAttr()
 

frigate/object_processing.py

@@ -143,6 +143,9 @@ class TrackedObject:
         bottom_center = (self.obj_data["centroid"][0], self.obj_data["box"][3])
         # check each zone
         for name, zone in self.camera_config.zones.items():
+            # if the zone is not for this object type, skip
+            if len(zone.objects) > 0 and not self.obj_data["label"] in zone.objects:
+                continue
             contour = zone.contour
             # check if the object is in the zone
             if cv2.pointPolygonTest(contour, bottom_center, False) >= 0: