  As interactive devices become pervasive, people are beginning to looking for
more advanced interaction with televisions in the living room. Interactive
television has the potential to offer a very engaging experience. But most
common user tasks are still challenging with such systems, such as menu
selection or text input. And little work has been done on understanding and
sup-porting the effective design of freehand interaction with an TV in the
living room. In this paper, we perform two studies investi-gating freehand
gestural interaction with a consumer level sensor, which is suitable for TV
scenarios. In the first study, we inves-tigate a range of design factors for
tiled layout menu selection, including wearable feedback, push gesture depth,
target size and position in motor space. The results show that tactile and
audio feedback have no significant effect on performance and prefer-ence, and
these results inform potential designs for high selection performance. In the
second study, we investigate a common TV user task of text input using freehand
gesture. We design and evaluate two virtual keyboard layouts and three freehand
selec-tion methods. Results show that ease of use and error tolerance can be
both achieved using a text entry method utilizing a dual circle layout and an
expanding target selection technique. Finally, we propose design guidelines for
effective, usable and com-fortable freehand gestural interaction for
interactive TV based on the findings.
