From d91c938fdd416890880728cdd2601cb7b0b77ae2 Mon Sep 17 00:00:00 2001
From: facok <128763816+facok@users.noreply.github.com>
Date: Mon, 30 Mar 2026 07:42:43 +0800
Subject: [PATCH] fix BBoxJoin merging bboxes at image-index level instead of
 per-image

The old code used list.extend() on the outer (image-index) dimension,causing bboxes from different inputs to be treated as separate images rather than merged into the same image's bbox list.
---
 py/object_detector.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/py/object_detector.py b/py/object_detector.py
index d7ad6cd..c37744a 100644
--- a/py/object_detector.py
+++ b/py/object_detector.py
@@ -59,12 +59,13 @@ class LS_BBOXES_JOIN:
     CATEGORY = '😺dzNodes/LayerMask'
 
     def bboxes_join(self, bboxes_1, bboxes_2=None, bboxes_3=None, bboxes_4=None):
-        if bboxes_2 is not None:
-            bboxes_1.extend(bboxes_2)
-        if bboxes_3 is not None:
-            bboxes_1.extend(bboxes_3)
-        if bboxes_4 is not None:
-            bboxes_1.extend(bboxes_4)
+        all_inputs = [b for b in [bboxes_2, bboxes_3, bboxes_4] if b is not None]
+        for other in all_inputs:
+            for i in range(len(other)):
+                if i < len(bboxes_1):
+                    bboxes_1[i].extend(other[i])
+                else:
+                    bboxes_1.append(other[i])
         return (bboxes_1,)
 
 class LS_OBJECT_DETECTOR_FL2:
@@ -562,4 +563,4 @@ NODE_DISPLAY_NAME_MAPPINGS = {
     "LayerMask: ObjectDetectorMask": "LayerMask: Object Detector Mask(Advance)",
     "LayerMask: ObjectDetectorYOLO8": "LayerMask: Object Detector YOLO8(Advance)",
     "LayerMask: ObjectDetectorYOLOWorld": "LayerMask: Object Detector YOLO World(Obsolete)"
-}
\ No newline at end of file
+}