[image_view2] Use opencv2 c++ function to handle window
Merge remote-tracking branch 'refs/remotes/origin/master' into use-opencv-c++-function-to-handle-window
Merge remote-tracking branch 'refs/remotes/origin/master' into garaemon-use-opencv-c++-function-to-handle-window
Merge remote-tracking branch 'refs/remotes/origin/master' into garaemon-use-opencv-c++-function-to-handle-window
Merge pull request #656 from garaemon/use-opencv-c++-function-to-handle-window

[image_view2] Use opencv c++ function to handle window