Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absolute Geometry Calibration of Distributed Microphone Arrays in an
  Audio-Visual Sensor Network   Joint audio-visual speaker tracking requires that the locations of
microphones and cameras are known and that they are given in a common
coordinate system. Sensor self-localization algorithms, however, are usually
separately developed for either the acoustic or the visual modality and return
their positions in a modality specific coordinate system, often with an unknown
rotation, scaling and translation between the two. In this paper we propose two
techniques to determine the positions of acoustic sensors in a common
coordinate system, based on audio-visual correlates, i.e., events that are
localized by both, microphones and cameras separately. The first approach maps
the output of an acoustic self-calibration algorithm by estimating rotation,
scale and translation to the visual coordinate system, while the second solves
a joint system of equations with acoustic and visual directions of arrival as
input. The evaluation of the two strategies reveals that joint calibration
outperforms the mapping approach and achieves an overall calibration error of
0.20m even in reverberant environments.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat