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This monograph introduces novel responses to the different problems
that arise when multiple robots need to execute a task in
cooperation, each robot in the team having a monocular camera as
its primary input sensor. Its central proposition is that a
consistent perception of the world is crucial for the good
development of any multi-robot application. The text focuses on the
high-level problem of cooperative perception by a multi-robot
system: the idea that, depending on what each robot sees and its
current situation, it will need to communicate these things to its
fellows whenever possible to share what it has found and keep
updated by them in its turn. However, in any realistic scenario,
distributed solutions to this problem are not trivial and need to
be addressed from as many angles as possible. Distributed Consensus
with Visual Perception in Multi-Robot Systems covers a variety of
related topics such as: * distributed consensus algorithms; * data
association and robustness problems; * convergence speed; and *
cooperative mapping. The book first puts forward algorithmic
solutions to these problems and then supports them with empirical
validations working with real images. It provides the reader with a
deeper understanding of the problems associated to the perception
of the world by a team of cooperating robots with onboard cameras.
Academic researchers and graduate students working with multi-robot
systems, or investigating problems of distributed control or
computer vision and cooperative perception will find this book of
material assistance with their studies.
Vision-based control of wheeled mobile robots is an interesting
field of research from a scientific and even social point of view
due to its potential applicability. This book presents a formal
treatment of some aspects of control theory applied to the problem
of vision-based pose regulation of wheeled mobile robots. In this
problem, the robot has to reach a desired position and orientation,
which are specified by a target image. It is faced in such a way
that vision and control are unified to achieve stability of the
closed loop, a large region of convergence, without local minima
and good robustness against parametric uncertainty. Three different
control schemes that rely on monocular vision as unique sensor are
presented and evaluated experimentally. A common benefit of these
approaches is that they are valid for imaging systems obeying
approximately a central projection model, e.g., conventional
cameras, catadioptric systems and some fisheye cameras. Thus, the
presented control schemes are generic approaches. A minimum set of
visual measurements, integrated in adequate task functions, are
taken from a geometric constraint imposed between corresponding
image features. Particularly, the epipolar geometry and the
trifocal tensor are exploited since they can be used for generic
scenes. A detailed experimental evaluation is presented for each
control scheme.
This work examines the challenges of distributed map merging and
localization in multi-robot systems, which enables robots to
acquire the knowledge of their surroundings needed to carry out
coordinated tasks. After identifying the main issues associated
with this problem, each chapter introduces a different distributed
strategy for solving them. In addition to presenting a review of
distributed algorithms for perception in localization and map
merging, the text also provides the reader with the necessary tools
for proposing new solutions to problems of multi-robot perception,
as well as other interesting topics related to multi-robot
scenarios. The coverage is largely self-contained, supported by
numerous explanations and demonstrations, although references for
further study are also supplied. The reader will not require any
prior background knowledge, other than a basic understanding of
mathematics at a graduate-student level.
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