v3 weights (yolo11s, 204k merged plate dataset, val mAP50=0.944)

miner.py

@@ -465,7 +465,7 @@ class Miner:
         # which would otherwise decay but not kill the lower-conf copy at
         # our low score_threshold=0.01. Without this step the deployed miner
         # emitted 2-3 outputs per plate (verified on validator task 57820).
-        all_dets = self._cluster_dedup(all_dets, iou_thresh=0.5)
+        all_dets = self._cluster_dedup(all_dets, iou_thresh=0.3)
 
         dets = self._soft_nms(all_dets)
 
@@ -475,6 +475,18 @@ class Miner:
             iy1 = max(0, min(orig_h, math.floor(y1)))
             ix2 = max(0, min(orig_w, math.ceil(x2)))
             iy2 = max(0, min(orig_h, math.ceil(y2)))
+            bw = ix2 - ix1
+            bh = iy2 - iy1
+            # Post-filter: reject non-plate geometry.
+            # F1a: oversized boxes (banners/text overlays at frame edges)
+            if max(bw, bh) > 150:
+                continue
+            # F1b: portrait-aspect boxes below confidence threshold —
+            # real plates are wider than tall; portrait boxes at low conf
+            # are vertical artifacts (posts, signs). High-conf portrait
+            # plates (e.g. vertically mounted) are preserved.
+            if bh > 0 and bw < bh * 0.8 and conf < 0.5:
+                continue
             out_boxes.append(
                 BoundingBox(
                     x1=ix1,