Since a few years ago, 3D gesture recognition systems have become the new phase in equipping users with the creativity and facility to communicate and interact with technologies. With the recent integration of 3D depth cameras in devices, such as smartphones, tablets, and gaming system (e.g. the Microsoft Kinect), free-space gestures are a relatively new means that can expand and surpass current interaction modality. Although novel, such mode has yet to be the preferred interaction, as it remains to be compared to the popular touch-based interaction, which provides smooth and facile user...