Fix Grounding DINO detections dropped by ByteTracker threshold mismatch

Lower ByteTracker new_track_thresh from 0.40 to 0.30 so DINO scores
(≥0.35) can spawn tracks. Harden DINO _post_process to remove bare
fallback that silently dropped to HuggingFace default threshold of 0.25.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

models/detectors/grounding_dino.py

@@ -62,25 +62,19 @@ class GroundingDinoDetector(ObjectDetector):
             return self.processor.post_process_grounded_object_detection(
                 outputs,
                 input_ids,
-                box_threshold=self.box_threshold,
+                threshold=self.box_threshold,
                 text_threshold=self.text_threshold,
                 target_sizes=target_sizes,
             )
         except TypeError:
-            try:
-                return self.processor.post_process_grounded_object_detection(
-                    outputs,
-                    input_ids,
-                    threshold=self.box_threshold,
-                    text_threshold=self.text_threshold,
-                    target_sizes=target_sizes,
-                )
-            except TypeError:
-                return self.processor.post_process_grounded_object_detection(
-                    outputs,
-                    input_ids,
-                    target_sizes=target_sizes,
-                )
+            # Older transformers versions used box_threshold
+            return self.processor.post_process_grounded_object_detection(
+                outputs,
+                input_ids,
+                box_threshold=self.box_threshold,
+                text_threshold=self.text_threshold,
+                target_sizes=target_sizes,
+            )
 
     def _parse_single_result(self, processed) -> DetectionResult:
         boxes = processed["boxes"].cpu().numpy()

utils/tracker.py

@@ -360,7 +360,7 @@ class STrack:
 
 class ByteTracker:
     def __init__(self, track_high_thresh=0.3, track_low_thresh=0.1,
-                 new_track_thresh=0.4, track_buffer=60, match_thresh=0.8,
+                 new_track_thresh=0.3, track_buffer=60, match_thresh=0.8,
                  frame_rate=30, min_hits=3):
         STrack.reset_count()
         self.track_high_thresh = track_high_thresh