Add --matcher-type option

opendm/config.py

@@ -157,6 +157,15 @@ def config(argv=None, parser=None):
                             'Can be one of: %(choices)s. Default: '
                             '%(default)s'))
     
+    parser.add_argument('--matcher-type',
+                        metavar='<string>',
+                        action=StoreValue,
+                        default='flann',
+                        choices=['flann', 'bow'],
+                        help=('Matcher algorithm, Fast Library for Approximate Nearest Neighbors or Bag of Words. FLANN is slower, but more stable. BOW is faster, but can sometimes miss valid matches. '
+                            'Can be one of: %(choices)s. Default: '
+                            '%(default)s'))
+
     parser.add_argument('--matcher-neighbors',
                         metavar='<integer>',
                         action=StoreValue,

opendm/osfm.py

@@ -105,7 +105,7 @@ class OSFMContext:
                 except Exception as e:
                     log.ODM_WARNING("Cannot set camera_models_overrides.json: %s" % str(e))
 
-            use_bow = False
+            use_bow = args.matcher_type == "bow"
             feature_type = "SIFT"
 
             # GPSDOP override if we have GPS accuracy information (such as RTK)