Merge pull request #9049 from Cartucho:improve_mask_tutorial_codes
authorAlexander Alekhin <alexander.a.alekhin@gmail.com>
Mon, 21 Aug 2017 07:14:45 +0000 (07:14 +0000)
committerAlexander Alekhin <alexander.a.alekhin@gmail.com>
Mon, 21 Aug 2017 07:14:46 +0000 (07:14 +0000)

Trivial merge