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Usability Evaluation of Behind the Screen Interaction

A system (VizSpace) was evaluated that extends the conventional touch table interface by decoupling the display and placing it above the touch surface to create an interaction volume beneath the display. This physically situated setup enables touch and hand interactions beneath the display, allowing users to reach inside with their hands and interact in a 3D virtual workspace. This paper presents an empirical investigation of the performance and usability of such a system. Participants were asked to perform an object translation task that compares 2D drag with 3D grasp interaction techniques whilst also varying the height of the interaction volume. Results suggest that participants completed the task faster and more accurately with the 2D drag interaction mode compared to the 3D grasp interaction mode. More importantly, the size of the interaction volume did not affect task performance but system usability and subjective perception rankings were ranked lower for the least interaction volume with the clearest viewing area. Results suggest that a larger interaction area behind the screen is more important than a clearer viewing area.