Fix label comparison in voc format (#1382)

CHANGELOG.md

@@ -35,6 +35,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Merge is allowed for points, but clicks on points conflict with frame dragging logic
 - Removed objects are visible for search
 - Add missed task_id and job_id fields into exception logs for the new UI (https://github.com/opencv/cvat/pull/1372)
+- VOC format exports Upper case labels correctly in lower case (https://github.com/opencv/cvat/pull/1379)
 - Fixed polygon exporting bug in COCO dataset (https://github.com/opencv/cvat/issues/1387)
 - Task creation from remote files (https://github.com/opencv/cvat/pull/1392)
 

datumaro/datumaro/plugins/voc_format/converter.py

@@ -1,5 +1,5 @@
 
-# Copyright (C) 2019 Intel Corporation
+# Copyright (C) 2020 Intel Corporation
 #
 # SPDX-License-Identifier: MIT
 
@@ -110,8 +110,8 @@ def init_dirs(self):
         self._images_dir = images_dir
 
     def get_label(self, label_id):
-        return self._extractor.categories()[AnnotationType.label] \
-            .items[label_id].name
+        return self._strip_label(self._extractor. \
+            categories()[AnnotationType.label].items[label_id].name)
 
     def save_subsets(self):
         subsets = self._extractor.subsets()
@@ -426,7 +426,7 @@ def _load_categories(self, label_map_source=None):
             label_map = OrderedDict()
             label_map['background'] = [None, [], []]
             for item in labels.items:
-                label_map[item.name] = [None, [], []]
+                label_map[self._strip_label(item.name)] = [None, [], []]
 
         elif label_map_source in [LabelmapType.guess.name, None]:
             # generate colormap for union of VOC and input dataset labels
@@ -489,7 +489,7 @@ def _get_actions(self, label):
 
     def _make_label_id_map(self):
         source_labels = {
-            id: label.name for id, label in
+            id: self._strip_label(label.name) for id, label in
             enumerate(self._extractor.categories().get(
                 AnnotationType.label, LabelCategories()).items)
         }

datumaro/tests/test_voc_format.py

@@ -649,7 +649,7 @@ def __iter__(self):
 
             def categories(self):
                 label_cat = LabelCategories()
-                label_cat.add('label_1')
+                label_cat.add('Label_1') # should become lowercase
                 label_cat.add('label_2')
                 return {
                     AnnotationType.label: label_cat,