Update app.py

app.py

@@ -46,20 +46,20 @@ def detect_qr_opencv(image_np: np.ndarray) -> List[Dict[str, Any]]:
     Use OpenCV's QRCodeDetector to find and decode QR codes.
     Returns list of dicts: {bbox: [x1,y1,x2,y2], data: str, points: np.ndarray}
     """
+    def detect_qr_opencv(image_np):
     det = cv2.QRCodeDetector()
-    data, points, _ = det.detectAndDecodeMulti(image_np)
-    results = []
-    if points is None:
-        # Try single QR fallback
-        data_single, points_single, _ = det.detectAndDecode(image_np)
-        if points_single is not None and data_single:
-            pts = np.array(points_single, dtype=np.float32).reshape(-1, 2)
-            x1, y1 = np.min(pts[:,0]), np.min(pts[:,1])
-            x2, y2 = np.max(pts[:,0]), np.max(pts[:,1])
-            results.append({"bbox": [float(x1), float(y1), float(x2), float(y2)],
-                            "data": data_single,
-                            "points": pts.tolist()})
-        return results
+    
+    try:
+        # For OpenCV >= 4.5.3
+        retval, decoded_info, points, _ = det.detectAndDecodeMulti(image_np)
+        if retval:
+            return decoded_info, points
+        else:
+            return [], []
+    except:
+        # Fallback to single QR detection
+        data, points, _ = det.detectAndDecode(image_np)
+        return [data] if data else [], points
 
     # points shape: (N,4,2), data is list/tuple of strings (may be '' for undecodeable)
     if isinstance(data, (list, tuple)):