Interacting with multi-touch handheld devices in augmented reality spaces: effects of marker and screen size

During the last years popularity of Augmented Reality (AR) has grown considerably. Nowadays most people have handheld devices equipped with camera, a variety of sensors and high computational power capable of rendering graphics previously only available on desktop computers. Such devices have replaced buttons with multi-touch screens as their main input system. In this paper we design and implement a technique for multi-touch handheld devices to manipulate objects in three-dimensional spaces. By mean of three experiments we studied the effect of workspace and device size on the performance.