81,988 research outputs found
Building a grid-semantic map for the navigation of service robots through human–robot interaction
AbstractThis paper presents an interactive approach to the construction of a grid-semantic map for the navigation of service robots in an indoor environment. It is based on the Robot Operating System (ROS) framework and contains four modules, namely Interactive Module, Control Module, Navigation Module and Mapping Module. Three challenging issues have been focused during its development: (i) how human voice and robot visual information could be effectively deployed in the mapping and navigation process; (ii) how semantic names could combine with coordinate data in an online Grid-Semantic map; and (iii) how a localization–evaluate–relocalization method could be used in global localization based on modified maximum particle weight of the particle swarm. A number of experiments are carried out in both simulated and real environments such as corridors and offices to verify its feasibility and performance
BLE Beacons for Indoor Positioning at an Interactive IoT-Based Smart Museum
The Internet of Things (IoT) can enable smart infrastructures to provide
advanced services to the users. New technological advancement can improve our
everyday life, even simple tasks as a visit to the museum. In this paper, an
indoor localization system is presented, to enhance the user experience in a
museum. In particular, the proposed system relies on Bluetooth Low Energy (BLE)
beacons proximity and localization capabilities to automatically provide the
users with cultural contents related to the observed artworks. At the same
time, an RSS-based technique is used to estimate the location of the visitor in
the museum. An Android application is developed to estimate the distance from
the exhibits and collect useful analytics regarding each visit and provide a
recommendation to the users. Moreover, the application implements a simple
Kalman filter in the smartphone, without the need of the Cloud, to improve
localization precision and accuracy. Experimental results on distance
estimation, location, and detection accuracy show that BLE beacon is a
promising solution for an interactive smart museum. The proposed system has
been designed to be easily extensible to the IoT technologies and its
effectiveness has been evaluated through experimentation
Cooperative μUAV-UGV autonomous indoor surveillance
In this paper, we present a heterogenous UGV-UAV system cooperatively solving tasks of periodical surveillance in indoor environments. In the proposed scenario, the UGV is equipped with an interactive helipad and it acts as a carrier of the UAV. The UAV is a light-weight quadro-rotor helicopter equipped with two cameras, which are used to inspect locations inaccessible for the UGV. The paper is focused on the most crucial aspects of the proposed UAV-UGV periodical surveillance that are visual navigation, localization and autonomous landing that need to be done periodically. We propose two concepts of mobile helipads employed for correction of imprecise landing of the UAV. Beside the description of the visual navigation, relative localization and both helipads, a study of landing performance is provided. The performance of the complex system is proven by an experiment of autonomous periodical surveillance in a changing environment with presence of people
Integration and coordination in a cognitive vision system
In this paper, we present a case study that exemplifies
general ideas of system integration and coordination.
The application field of assistant technology provides an
ideal test bed for complex computer vision systems including
real-time components, human-computer interaction, dynamic
3-d environments, and information retrieval aspects.
In our scenario the user is wearing an augmented reality device
that supports her/him in everyday tasks by presenting
information that is triggered by perceptual and contextual
cues. The system integrates a wide variety of visual functions
like localization, object tracking and recognition, action
recognition, interactive object learning, etc. We show
how different kinds of system behavior are realized using
the Active Memory Infrastructure that provides the technical
basis for distributed computation and a data- and eventdriven
integration approach
SMART-I²: Spatial Multi-users Audio-visual Real Time Interactive Interface, a broadcast application context
International audienceSMART-I2 is a high quality 3D audio-visual interactive rendering system. In SMART-I2, the screen is also used as a multichannel loudspeaker. The spatial audio rendering is based on Wave Field Synthesis, an approach that creates a coherent spatial perception of sound over a large listening area. The azimuth localization accuracy of the system has been verifed by a perceptual experiment. Contrary to conventional systems, SMART-I2 is able to realize a high degree of 3D audio-visual integration with almost no compromise on either the audio or the graphics rendering quality. Such a system can provide benefits to a wide range of applications. Index Terms-- Audio-visual integratio
Feedback-induced interactive dynamics: unitary but dissipative evolution
The time evolution of a physical system is generally described by a
differential equation, which can be solved numerically by adopting a difference
scheme with space-time discretization. This discretization, as a numerical
artifact, results in accumulated errors during evolution thus usually plays a
negative role in simulations. In a quantum circuit, however, the ``evolution
time'' is represented by the depth of the circuit layer, thus is intrinsically
discrete. Hence, the discretization-induced error therein is not a numerical
artifact, but a physical observable effect responsible for remarkable
nonequilibrium phenomena absent in conventional quantum dynamics. In this
paper, we show that the combination of measurement feedback and temporal
discretization can give rise to a new type of quantum dynamics characterized by
unitary but dissipative evolution. As physical consequences of such an unitary
but dissipative evolution, a nonequilibrium steady state with spontaneous
symmetry breaking is revealed in a zero-dimensional (single-qubit) system. A
localization mechanism distinct from that in the well-established Anderson
localization has also been proposed in an one-dimensional interactive quantum
system.Comment: accepted by Science Bulleti
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