Digital Image Processing
High precision touch screen interaction
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Visual tracking of bare fingers for interactive surfaces
Proceedings of the 17th annual ACM symposium on User interface software and technology
Precise selection techniques for multi-touch screens
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Vision-based hand pose estimation: A review
Computer Vision and Image Understanding
Fitts' law as a research and design tool in human-computer interaction
Human-Computer Interaction
Back-of-device interaction allows creating very small touch devices
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Effects of motor scale, visual scale, and quantization on small target acquisition difficulty
ACM Transactions on Computer-Human Interaction (TOCHI)
On the limits of the human motor control precision: the search for a device's human resolution
INTERACT'11 Proceedings of the 13th IFIP TC 13 international conference on Human-computer interaction - Volume Part II
Mobile pointing task in the physical world: balancing focus and performance while disambiguating
Proceedings of the 15th international conference on Human-computer interaction with mobile devices and services
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This paper addresses the limit of user precision in pointing to a target when the finger is already in contact with a touch surface. User precision was measured for linear and rotational pointing. We developed a novel experimental protocol that improves the estimation of user's precision as compare to previous protocols. Our protocol depends on high-resolution measurements of finger motions. This was achieved by the means of two optical finger trackers specially developed for this study. The trackers provide stable and precise measurements of finger translations and rotations. We used them in two user experiments that revealed that (a) user's precision for linear pointing is about 150dpi or 0.17mm, and (b) user can reliably point at sectors as narrow as 2.76 degrees in 2s in rotational pointing. Our results provide new information for the optimization of interactions and sensing devices that involve finger pointing on a surface.