1,547 research outputs found
Eye Tracker Accuracy: Quantitative Evaluation of the Invisible Eye Center Location
Purpose. We present a new method to evaluate the accuracy of an eye tracker
based eye localization system. Measuring the accuracy of an eye tracker's
primary intention, the estimated point of gaze, is usually done with volunteers
and a set of fixation points used as ground truth. However, verifying the
accuracy of the location estimate of a volunteer's eye center in 3D space is
not easily possible. This is because the eye center is an intangible point
hidden by the iris. Methods. We evaluate the eye location accuracy by using an
eye phantom instead of eyes of volunteers. For this, we developed a testing
stage with a realistic artificial eye and a corresponding kinematic model,
which we trained with {\mu}CT data. This enables us to precisely evaluate the
eye location estimate of an eye tracker. Results. We show that the proposed
testing stage with the corresponding kinematic model is suitable for such a
validation. Further, we evaluate a particular eye tracker based navigation
system and show that this system is able to successfully determine the eye
center with sub-millimeter accuracy. Conclusions. We show the suitability of
the evaluated eye tracker for eye interventions, using the proposed testing
stage and the corresponding kinematic model. The results further enable
specific enhancement of the navigation system to potentially get even better
results
The Ultraviolet View of the Magellanic Clouds from GALEX: A First Look at the LMC Source Catalog
The Galaxy Evolution Exporer (GALEX) has performed unprecedented imaging
surveys of the Magellanic Clouds (MC) and their surrounding areas including the
Magellanic Bridge (MB) in near-UV (NUV, 1771-2831\AA) and far-UV (FUV,
1344-1786\AA) bands at 5" resolution. Substantially more area was covered in
the NUV than FUV, particularly in the bright central regions, because of the
GALEX FUV detector failure. The 5 depth of the NUV imaging varies
between 20.8 and 22.7 (ABmag). Such imaging provides the first sensitive view
of the entire content of hot stars in the Magellanic System, revealing the
presence of young populations even in sites with extremely low star-formation
rate surface density like the MB, owing to high sensitivity of the UV data to
hot stars and the dark sky at these wavelengths.
The density of UV sources is quite high in many areas of the LMC and SMC.
Crowding limits the quality of source detection and photometry from the
standard mission pipeline processing. We performed custom-photometry of the
GALEX data in the MC survey region ( from the LMC,
from the SMC). After merging multiple detections of sources in overlapping
images, the resulting catalog we have produced for the LMC contains nearly 6
million unique NUV point sources within 15 and is briefly presented
herein. This paper provides a first look at the GALEX MC survey and highlights
some of the science investigations that the entire catalog and imaging dataset
will make possible.Comment: 16 pages, 8 figures; J. Adv. Space Res. (2013
Charged complexes at the surface of liquid helium
Charged clusters in liquid helium in an external electric field form a
two-dimensional system below the helium surface. This 2D system undergoes a
phase transition from a liquid to a Wigner crystal at rather high temperatures.
Contrary to the electron Wigner crystal, the Wigner lattice of charged clusters
can be detected directly.Comment: 6 pages, 1 figur
5D fuzzball geometries and 4D polar states
We analyze the map between a class of `fuzzball' solutions in five dimensions
and four-dimensional multicentered solutions under the 4D-5D connection, and
interpret the resulting configurations in the framework of Denef and Moore. In
five dimensions, we consider Kaluza-Klein monopole supertubes with circular
profile which represent microstates of a small black ring. The resulting
four-dimensional configurations are, in a suitable duality frame, polar states
consisting of stacks of D6 and anti-D6 branes with flux. We argue that these
four-dimensional configurations represent zero-entropy constituents of a
2-centered configuration where one of the centers is a small black hole. We
also discuss how spectral flow transformations in five dimensions, leading to
configurations with momentum, give rise to four-dimensional D6 anti-D6 polar
configurations with different flux distributions at the centers.Comment: Latex, 36 pages, 2 figures. v2: typos corrected, references added,
published versio
Subjektfinanzierung im Behindertenwesen : freie Lebensgestaltung von Menschen mit Behinderung - durch Subjektfinanzierung?
Menschen mit Behinderung erhalten die Gelder, die für ihre Unterstützung vorgesehen sind, direkt vom Kanton und entscheiden selbst, welche Dienstleistungen sie einkaufen und wie sie ihr Leben führen wollen. Doch reicht es für eine freiere Lebensgestaltung aus, die Gelder anders zu verteilen? Oder anders gefragt: Wer muss dazu eigentlich was können und verstehen? Im White Paper werden die Herausforderungen, die mit der Subjektfinanzierung für die drei Akteure – Menschen mit Behinderung, Leistungsanbieter und Kanton – verbunden sind, und Handlungsbedarfe, damit die Subjektfinanzierung Menschen mit Behinderung neue Möglichkeiten eröffnet, skizziert
- …