Fix cropping

bob/db/uvad/query.py

@@ -49,7 +49,11 @@ class Database(FileListPadDatabase):
             # crop frames to 720 x 1024
             h, w = numpy.shape(frame)[-2:]
             dh, dw = (h - 720) // 2, (w - 1024) // 2
-            frame = frame[:, dh:-dh, dw:-dw]
+            if dh != 0:
+                frame = frame[:, dh:-dh, :]
+            if dw != 0:
+                frame = frame[:, :, dw:-dw]
+            assert frame.shape == self.frame_shape, frame.shape
             yield frame
 
     def number_of_frames(self, padfile):

bob/db/uvad/test.py

@@ -38,3 +38,5 @@ def test_frames():
             "way we can test more features of the database interface.")
     padfile = db.all_files(('train', 'dev'))[0][0]
     assert db.number_of_frames(padfile) == 270, db.number_of_frames(padfile)
+    frame = next(db.frames(padfile))
+    assert db.frame_shape == frame.shape, frame.shape