only use max target box for relative zoom limiter (blakeblackshear#8509)

frigate/ptz/autotrack.py

@@ -863,21 +863,11 @@ def _should_zoom_in(self, camera, obj, box, debug_zooming=False):
  # introduce some hysteresis to prevent a yo-yo zooming effect
  zoom_out_hysteresis = (
  self.tracked_object_metrics[camera]["target_box"]
- > (
- self.tracked_object_metrics[camera]["original_target_box"]
- * AUTOTRACKING_ZOOM_OUT_HYSTERESIS
- )
- or self.tracked_object_metrics[camera]["target_box"]
  > self.tracked_object_metrics[camera]["max_target_box"]
  * AUTOTRACKING_ZOOM_OUT_HYSTERESIS
  )
  zoom_in_hysteresis = (
  self.tracked_object_metrics[camera]["target_box"]
- < (
- self.tracked_object_metrics[camera]["original_target_box"]
- * AUTOTRACKING_ZOOM_IN_HYSTERESIS
- )
- or self.tracked_object_metrics[camera]["target_box"]
  < self.tracked_object_metrics[camera]["max_target_box"]
  * AUTOTRACKING_ZOOM_IN_HYSTERESIS
  )
@@ -1073,15 +1063,14 @@ def _get_zoom_amount(self, camera, obj, predicted_box, debug_zoom=True):
  )
  ) is not None:
  # zoom value
- limit = (
- self.tracked_object_metrics[camera]["original_target_box"]
- if self.tracked_object_metrics[camera]["target_box"]
- < self.tracked_object_metrics[camera]["max_target_box"]
- else self.tracked_object_metrics[camera]["max_target_box"]
+ ratio = (
+ self.tracked_object_metrics[camera]["max_target_box"]
+ / self.tracked_object_metrics[camera]["target_box"]
  )
- ratio = limit / self.tracked_object_metrics[camera]["target_box"]
  zoom = (ratio - 1) / (ratio + 1)
- logger.debug(f"{camera}: Zoom calculation: {zoom}")
+ logger.debug(
+ f'{camera}: limit: {self.tracked_object_metrics[camera]["max_target_box"]}, ratio: {ratio} zoom calculation: {zoom}'
+ )
  if not result:
  # zoom out with special condition if zooming out because of velocity, edges, etc.
  zoom = -(1 - zoom) if zoom > 0 else -(zoom * 2 + 1)