Hand occlusion on a multi-touch tabletop

Abstract

We examine the shape of hand and forearm occlusion on a multi-touch table for different touch contact types and tasks. Individuals have characteristic occlusion shapes, but with commonalities across tasks, postures, and handedness. Based on this, we create templates for designers to justify occlusion-related decisions and we propose geometric models capturing the shape of occlusion. A model using diffused illumination captures performed well when augmented with a forearm rectangle, as did a modified circle and rectangle model with ellipse "fingers" suitable when only X-Y contact positions are available. Finally, we describe the corpus of detailed multi-touch input data we generated which is available to the community.

Multi-touch gestures for pre-kindergarten children

“…It would therefore be interesting to explore potential improvements in multi-touch usability, for instance by determining and filtering out unexpected blob contacts wherever applicable. In this respect, works such as those of (Schwarz et al, 2014) and (Vogel et al, 2012), who studied the detection of different types of contacts and occlusion patterns on multitouch surfaces, could be used as a starting point.…”

Touch interaction for children aged 3 to 6 years: Experimental findings and relationship to motor skills

“…Consequently, their performance was affected by not being able to see the visual feedback of their task in progress, such as dragging the item towards the new location. To compensate for this aspect, techniques from the literature that detect and avoid occlusion, such as the ones introduced by Vogel and Balakrishnan (2010) andVogel and Casiez (2012) could also be adopted for children's touch interactions. However, we haven't found references in the literature to validate such techniques for children.…”

ObjecTop

“…Our work also relates to prior studies focusing on occlusion of screen contents created by users' fingers, hands and forearms during direct touch or pen-based input [12,13,14,15]. Shift [12] addressed the problem of finger occlusion on small handheld touch screen devices by displaying a callout showing a copy of the occluded screen area.…”

“…Vogel et al [14] presented a similar technique for stylus displays based on a detailed model of the user's hand. This model was later refined for multitouch gestures [15]. Occlusion by the hand and forearm is considerably different from occlusion by physical objects because physical objects are generally less frequently moved, have less predictable shapes, and can be more numerous as most of our desktops attest by the common presence of piles of papers, magazines, soda cans, coffee cups, and other objects.…”