ZeroTouch (ZT) is a unique optical sensing technique and architecture that allows precision
sensing of hands, fingers, and other objects within a constrained 2-dimensional plane …

Applications in smart environments can make use of a user positioning service for various
purposes such as activity recognition, context awareness and indoor navigation. We …

Given a set of n non-overlapping unit disks in the plane, a line l is called blocked if it
intersects at least one of the disks and a point p is called a shadow point if all lines …

Indoor positioning is a service required by many smart environment applications for various
purposes, such as activity classification, indoor navigation and context awareness. In this …

We propose an approach for recognition of mobile devices on interactive surfaces that do
not support optical markers. Our system only requires an axis aligned bounding box of the …

We consider the problem of blocking all rays emanating from a unit disk U by a minimum
number Nd of unit disks in the two-dimensional space, where each disk has at least a …

We consider the problem of blocking all rays emanating from a closed unit disk with a
minimum number of closed unit disks in the two-dimensional space, where the minimum …