19,841 research outputs found
Disconnected Skeleton: Shape at its Absolute Scale
We present a new skeletal representation along with a matching framework to
address the deformable shape recognition problem. The disconnectedness arises
as a result of excessive regularization that we use to describe a shape at an
attainably coarse scale. Our motivation is to rely on the stable properties of
the shape instead of inaccurately measured secondary details. The new
representation does not suffer from the common instability problems of
traditional connected skeletons, and the matching process gives quite
successful results on a diverse database of 2D shapes. An important difference
of our approach from the conventional use of the skeleton is that we replace
the local coordinate frame with a global Euclidean frame supported by
additional mechanisms to handle articulations and local boundary deformations.
As a result, we can produce descriptions that are sensitive to any combination
of changes in scale, position, orientation and articulation, as well as
invariant ones.Comment: The work excluding {\S}V and {\S}VI has first appeared in 2005 ICCV:
Aslan, C., Tari, S.: An Axis-Based Representation for Recognition. In
ICCV(2005) 1339- 1346.; Aslan, C., : Disconnected Skeletons for Shape
Recognition. Masters thesis, Department of Computer Engineering, Middle East
Technical University, May 200
Birefringent and dichroic behaviour of plasmonic nano-antennas
Birefringence and dichroism of plasmonic nano-antennas are investigated. We
demonstrate that birefringent and dichroic behaviour of a cross-dipole nanoantenna is due to a length difference, and a relative plasmonic enhancement of the antenna particles, respectively
Single scale factor for the universe from the creation of radiation and matter till the present
A scheme for incorporating the creation of radiation and matter into the
cosmological evolution is introduced so that it becomes possible to merge the
times before and after the creation of radiation and matter in a single scale
factor in Robertson-Walker metric. This scheme is illustrated through a toy
model that has the prospect of constituting a basis for a realistic model.Comment: Minor typos are corrected, an acknowledgment is added, to be
published in The European Physical Journal
Fermion families, and chirality through extra dimensions
We give a simple model to explain the origin of fermion families, and
chirality through the use of a domain wall placed in a five dimensional
space-time.Comment: 12 page
Higgs field as the gauge field corresponding to parity in the usual space-time
We find that the local character of field theory requires the parity degree
of freedom of the fields to be considered as an additional dicrete fifth
dimension which is an artifact emerging due to the local description of
space-time. Higgs field arises as the gauge field corresponding to this
discrete dimension. Hence the noncommutative geometric derivation of the
standard model follows as a manifestation of the local description of the usual
space-time.Comment: 14 pages, latex, no figure
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