add ability to specify min and max area as percentages

frigate/config/camera/objects.py

@@ -11,11 +11,13 @@ DEFAULT_TRACKED_OBJECTS = ["person"]
 
 
 class FilterConfig(FrigateBaseModel):
-    min_area: int = Field(
-        default=0, title="Minimum area of bounding box for object to be counted."
+    min_area: Union[int, float] = Field(
+        default=0,
+        title="Minimum area of bounding box for object to be counted. Can be pixels (int) or percentage (float between 0.01 and 0.99).",
     )
-    max_area: int = Field(
-        default=24000000, title="Maximum area of bounding box for object to be counted."
+    max_area: Union[int, float] = Field(
+        default=24000000,
+        title="Maximum area of bounding box for object to be counted. Can be pixels (int) or percentage (float between 0.01 and 0.99).",
     )
     min_ratio: float = Field(
         default=0,

frigate/config/config.py

@@ -29,6 +29,7 @@ from frigate.util.builtin import (
 )
 from frigate.util.config import (
     StreamInfoRetriever,
+    convert_area_to_pixels,
     find_config_file,
     get_relative_coordinates,
     migrate_frigate_config,
@@ -143,6 +144,13 @@ class RuntimeFilterConfig(FilterConfig):
         if mask is not None:
             config["mask"] = create_mask(frame_shape, mask)
 
+        # Convert min_area and max_area to pixels if they're percentages
+        if "min_area" in config:
+            config["min_area"] = convert_area_to_pixels(config["min_area"], frame_shape)
+
+        if "max_area" in config:
+            config["max_area"] = convert_area_to_pixels(config["max_area"], frame_shape)
+
         super().__init__(**config)
 
     def dict(self, **kwargs):

frigate/util/config.py

@@ -347,6 +347,36 @@ def get_relative_coordinates(
     return mask
 
 
+def convert_area_to_pixels(
+    area_value: Union[int, float], frame_shape: tuple[int, int]
+) -> int:
+    """
+    Convert area specification to pixels.
+
+    Args:
+        area_value: Area value (pixels or percentage)
+        frame_shape: Tuple of (height, width) for the frame
+
+    Returns:
+        Area in pixels
+    """
+    # If already an integer, assume it's in pixels
+    if isinstance(area_value, int):
+        return area_value
+
+    # Check if it's a percentage
+    if isinstance(area_value, float):
+        if 0.000001 <= area_value <= 0.99:
+            frame_area = frame_shape[0] * frame_shape[1]
+            return max(1, int(frame_area * area_value))
+        else:
+            raise ValueError(
+                f"Percentage must be between 0.000001 and 0.99, got {area_value}"
+            )
+
+    raise TypeError(f"Unexpected type for area: {type(area_value)}")
+
+
 class StreamInfoRetriever:
     def __init__(self) -> None:
         self.stream_cache: dict[str, tuple[int, int]] = {}

web/src/components/overlay/detail/ObjectLifecycle.tsx

@@ -490,12 +490,27 @@ export default function ObjectLifecycle({
                             Area
                           </p>
                           {Array.isArray(item.data.box) &&
-                          item.data.box.length >= 4
-                            ? Math.round(
-                                detectArea *
-                                  (item.data.box[2] * item.data.box[3]),
-                              )
-                            : "N/A"}
+                          item.data.box.length >= 4 ? (
+                            <>
+                              <div className="flex flex-col text-xs">
+                                px:{" "}
+                                {Math.round(
+                                  detectArea *
+                                    (item.data.box[2] * item.data.box[3]),
+                                )}
+                              </div>
+                              <div className="flex flex-col text-xs">
+                                %:{" "}
+                                {(
+                                  (detectArea *
+                                    (item.data.box[2] * item.data.box[3])) /
+                                  detectArea
+                                ).toFixed(4)}
+                              </div>
+                            </>
+                          ) : (
+                            "N/A"
+                          )}
                         </div>
                       </div>
                     </div>

web/src/views/settings/ObjectSettingsView.tsx

@@ -260,7 +260,7 @@ export default function ObjectSettingsView({
             </div>
           </TabsContent>
           <TabsContent value="objectlist">
-            {ObjectList(memoizedObjects)}
+            <ObjectList cameraConfig={cameraConfig} objects={memoizedObjects} />
           </TabsContent>
         </Tabs>
       </div>
@@ -284,7 +284,12 @@ export default function ObjectSettingsView({
   );
 }
 
-function ObjectList(objects?: ObjectType[]) {
+type ObjectListProps = {
+  cameraConfig: CameraConfig;
+  objects?: ObjectType[];
+};
+
+function ObjectList({ cameraConfig, objects }: ObjectListProps) {
   const { data: config } = useSWR<FrigateConfig>("config");
 
   const colormap = useMemo(() => {
@@ -326,7 +331,7 @@ function ObjectList(objects?: ObjectType[]) {
                     {capitalizeFirstLetter(obj.label.replaceAll("_", " "))}
                   </div>
                 </div>
-                <div className="flex w-8/12 flex-row items-end justify-end">
+                <div className="flex w-8/12 flex-row items-center justify-end">
                   <div className="text-md mr-2 w-1/3">
                     <div className="flex flex-col items-end justify-end">
                       <p className="mb-1.5 text-sm text-primary-variant">
@@ -351,7 +356,25 @@ function ObjectList(objects?: ObjectType[]) {
                       <p className="mb-1.5 text-sm text-primary-variant">
                         Area
                       </p>
-                      {obj.area ? obj.area.toString() : "-"}
+                      {obj.area ? (
+                        <>
+                          <div className="text-xs">
+                            px: {obj.area.toString()}
+                          </div>
+                          <div className="text-xs">
+                            %:{" "}
+                            {(
+                              obj.area /
+                              (cameraConfig.detect.width *
+                                cameraConfig.detect.height)
+                            )
+                              .toFixed(4)
+                              .toString()}
+                          </div>
+                        </>
+                      ) : (
+                        "-"
+                      )}
                     </div>
                   </div>
                 </div>