update after ojzm

src/orisys/Stitcher.py

@@ -449,7 +449,7 @@ class Stitcher:
         n_boxes = 0
         bk_thresh = 0  # initial black threshold
         bk_thresh_step = 5
-        bk_thresh_max = 100
+        bk_thresh_max = 150
 
         # Also include a low global V threshold to capture colored but dark tiles
         hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
@@ -458,7 +458,12 @@ class Stitcher:
         while n_boxes != n_boxes_target and bk_thresh <= bk_thresh_max:
             _, v_mask = cv2.threshold(v, bk_thresh, 255, cv2.THRESH_BINARY)  # tune 50 if needed
 
-            mask = v_mask
+            mask = v_mask.copy()
+            # Exclude left and right boundary (20 pixels each) from detection
+            edge = 20
+            if w > edge * 2:
+                mask[:, :edge] = 0
+                mask[:, -edge:] = 0
 
             # Morphology: remove small specks, fill small holes
             k = max(1, morph_k)