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In this paper, we describe Gesture Viewport, a projector-camera system that enables finger gesture interactions with media content on any surface. We propose a novel and computationally efficient finger localization method based on the detection of occlusion patterns inside a virtual sensor grid rendered in a layer on top of a viewport widget. We develop several robust interaction techniques to prevent...
Microsoft Kinect cameras provide a fast and convenient way to acquire depth information. However, the interference problem of multiple Kinect cameras dramatically degrades the depth quality. In this paper, we study the interference problem and propose an interference cancelation approach based on the statistical properties of depth maps. The gradient values are investigated and propagated from the...
Spatial reuse in a wireless network can allow multiple communications to proceed concurrently. Usually it seems that the more concurrent transmissions are allowed, the more the aggregate throughput can be sought. Unfortunately, to increase the level of spatial reuse, medium access control (MAC) protocols should either reduce the transmit power or increase the carrier sense (CS) threshold dynamically,...
In ad hoc networks, any concurrent transmission will add to the level of interference and collision experienced by other users. The spatial density of transmissions that could be supported subject to two constraints: the excessive interference of attempted receivers, the channel access collision of attempted transmitters. We combine two constraint factors and define channel interference and access...
Interference in the mobile ad hoc networks (MANET) influences performances of the networks badly. In this paper, we propound a new interference-aware probability forwarding (IPF) mechanism to reduce interference. Firstly, IPF is to adjust the carrier sensing threshold, resulting in a higher level of spatial reuse. Secondly, IPF distributes a probability to every node. The probability is related with...
Topology control in wireless ad hoc networks can be considered the task of given a network connectivity graph computing a sub graph with specific desired properties, such as connectivity, symmetry, sparsity, low interference. All previous approaches used for topology control have in common that they model wireless networks as purely geometric graphs, hence neglecting one of the most crucial aspects...
Physical carrier sensing plays an important role in collision avoidance in wireless networks, and the size of the physical carrier sense threshold has a great impact on the system performance. As the channel access activities and packet reception rate of a node is affected by the accumulative interference, we present a new analytical approach that demonstrates how to tune the sense threshold to reduce...
The interference imposes a potential negative impact on the performance of a wireless network. A device is interfered if it receives a transmission not intended for it. In this paper, we introduce an explicit computation model of node interference based on its actual inducement on the physical layer. We prove that there exists an optimal algorithm to solve the corresponding topology control problem,...
The intrinsic flexibility and independence of infrastructure enable mobile ad hoc networks (MANET) to be widely used in various environments such as disaster rescue, and battlefield. Recently, researches have shown that interference can impose a significant impact on the performance of a MANET. However, there is no unified definition of interference in MANETs currently. Therefore, in this paper, we...
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