diff --git a/frigate/config.py b/frigate/config.py
index ae5e9ee80..be02f4607 100644
--- a/frigate/config.py
+++ b/frigate/config.py
@@ -8,7 +8,6 @@ from typing import Dict, List, Optional, Tuple, Union
 
 import matplotlib.pyplot as plt
 import numpy as np
-import yaml
 from pydantic import BaseModel, Extra, Field, validator, parse_obj_as
 from pydantic.fields import PrivateAttr
 
@@ -19,12 +18,12 @@ from frigate.const import (
     YAML_EXT,
 )
 from frigate.util import (
+    BoundingBoxTriggerEnum,
     create_mask,
     deep_merge,
     get_ffmpeg_arg_list,
     escape_special_characters,
     load_config_with_no_duplicates,
-    load_labels,
 )
 from frigate.ffmpeg_presets import (
     parse_preset_hardware_acceleration,
@@ -33,14 +32,11 @@ from frigate.ffmpeg_presets import (
     parse_preset_output_rtmp,
 )
 from frigate.detectors import (
-    PixelFormatEnum,
-    InputTensorEnum,
     ModelConfig,
     DetectorConfig,
 )
 from frigate.version import VERSION
 
-
 logger = logging.getLogger(__name__)
 
 # TODO: Identify what the default format to display timestamps is
@@ -277,13 +273,6 @@ class RuntimeFilterConfig(FilterConfig):
         extra = Extra.ignore
 
 
-class BoundingBoxTriggerEnum(str, Enum):
-    bottom_center = "bottom-center"
-    left_center = "left-center"
-    top_center = "top-center"
-    right_center = "right-center"
-
-
 # this uses the base model because the color is an extra attribute
 class ZoneConfig(BaseModel):
     filters: Dict[str, FilterConfig] = Field(
diff --git a/frigate/object_processing.py b/frigate/object_processing.py
index 49679f9b0..e1c2e077a 100644
--- a/frigate/object_processing.py
+++ b/frigate/object_processing.py
@@ -136,15 +136,19 @@ class TrackedObject:
 
         # check zones
         current_zones = []
-        bottom_center = (obj_data["centroid"][0], 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 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:
+            if zone.bounding_box_trigger.is_in_zone(
+                obj_data["centroid"],
+                obj_data["box"],
+                zone.contour,
+            ):
                 # 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)
diff --git a/frigate/util.py b/frigate/util.py
index 79fe7932f..29d83178f 100755
--- a/frigate/util.py
+++ b/frigate/util.py
@@ -5,6 +5,7 @@ import shlex
 import subprocess as sp
 import json
 import re
+from enum import Enum
 import signal
 import traceback
 import urllib.parse
@@ -972,3 +973,24 @@ class SharedMemoryFrameManager(FrameManager):
             self.shm_store[name].close()
             self.shm_store[name].unlink()
             del self.shm_store[name]
+
+
+class BoundingBoxTriggerEnum(str, Enum):
+    bottom_center = "bottom-center"
+    left_center = "left-center"
+    right_center = "right-center"
+    top_center = "top-center"
+
+    def is_in_zone(self, centroid, box, contour) -> bool:
+        """Tests a zone based on the bounding box
+        trigger and the objects bounding box."""
+        if self.value is self.bottom_center:
+            point = (centroid[0], box[3])
+        elif self.value is self.left_center:
+            point = (box[0], centroid[1])
+        elif self.value is self.right_center:
+            point = (box[2], centroid[1])
+        elif self.value is self.top_center:
+            point = (centroid[0], box[1])
+
+        return cv2.pointPolygonTest(contour, point, False) >= 0