348 research outputs found
Non-photorealistic image rendering with a labyrinthine tiling
The paper describes a new image processing for a non-photorealistic
rendering. The algorithm is based on a random generation of gray tones and
competing statistical requirements. The gray tone value of each pixel in the
starting image is replaced selecting among randomly generated tone values,
according to the statistics of nearest-neighbor and next-nearest-neighbor
pixels. Two competing conditions for replacing the tone values - one position
on the local mean value the other on the local variance - produce a peculiar
pattern on the image. This pattern has a labyrinthine tiling aspect. For
certain subjects, the pattern enhances the look of the image.Comment: 9 pages, 5 figure
Mapping Images with the Coherence Length Diagrams
Statistical pattern recognition methods based on the Coherence Length Diagram
(CLD) have been proposed for medical image analyses, such as quantitative
characterisation of human skin textures, and for polarized light microscopy of
liquid crystal textures. Further investigations are made on image maps
originated from such diagram and some examples related to irregularity of
microstructures are shown
Effects of GIMP Retinex Filtering Evaluated by the Image Entropy
A GIMP Retinex filtering can be used for enhancing images, with good results
on foggy images, as recently discussed. Since this filter has some parameters
that can be adjusted to optimize the output image, several approaches can be
decided according to desired results. Here, as a criterion for optimizing the
filtering parameters, we consider the maximization of the image entropy. We
use, besides the Shannon entropy, also a generalized entropy.Comment: Keywords: Image Processing, Foggy Images, Retinex, Shannon Entropy,
Generalized Entropies, Kaniadakis Entrop
A tour about Isaac Newton's life
Here we propose a tour about the life of Isaac Newton, using a georeferenced
method, based on the free satellite maps. Our tour is modelled on the time-line
of the great scientist's life, as an ancient "itinerarium" was modelled on the
Roman roads, providing a listing of places and intervening distances, sometimes
with short description or symbols concerning the places. KML language and
Google Earth, with its Street View and 3D images are powerful tools to create
this virtual tour.Comment: Georeferencing, Satellite Maps, KML, XML, Acme Mapper, History of
Physic
Self frequency-locking of a chain of oscillators
The paper studies the vibrational modes of a slightly damped uniform chain,
with n masses coupled by elastic forces. It will be shown that, for certain
lengths of the chain, that is for certain values of n, the damping of one of
the masses at a specific position in the chain is able to constrain the
vibration of the system to oscillate at a specific frequency. The damped mass
turns out to be a node of the chain, subdividing it in two parts. This node can
be considered as the synchronization element of the two subchains. As a
consequence the oscillating system of n-masses is self-locking to the
synchronized frequency of its subchains
Undulation textures at the phase transitions of some alkyloxybenzoic acids
We observed undulated smectic textures for some compounds of the
4,n-alkyloxybenzoic (nOBAC) acid series, at transitions between the smectic and
the isotropic phase and between the smectic and nematic phase. Studied
compounds were 12OBAC, 16OBAC and a binary mixture of 12- and 16OBAC. The
undulations are dressing a usual Schlieren texture. In the case of the binary
mixture, an interesting fingerprint pattern is observed too
Texture transitions in binary mixtures of 6OBAC with compounds of its homologous series
Recently we have observed in compounds of the 4,n-alkyloxybenzoic acid
series, with the homologous index n ranging from 6 to 9, a texture transition
in the nematic range which subdivides the nematic phase in two sub-phases
displaying different textures in polarised light analysis. To investigate a
persistence of texture transitions in nematic phases, we prepared binary
mixtures of 4,6-alkyloxybenzoic acid (6OBAC) with other members (7-,8-,9-,12-,
16OBAC) of its homologous series. Binary mixtures exhibit a broadening in the
temperature ranges of both smectic and nematic phases. A nematic temperature
range of 75 C is observed. In the nematic phase, in spite of the microscopic
disorder introduced by mixing two components, the polarised light optics
analysis of the liquid crystal cells reveals a texture transition. In the case
of the binary mixture of 6OBAC with 12OBAC and with 16OBAC, that is of
compounds with monomers of rather different lengths, the texture transition
temperature is not homogeneous in the cell, probably due to a local variation
in the relative concentrations of compounds.Comment: 13 pages, 9 figure
Composition law of -entropy for statistically independent systems
The intriguing and still open question concerning the composition law of
-entropy with and is here
reconsidered and solved. It is shown that, for a statistical system described
by the probability distribution , made up of two statistically
independent subsystems, described through the probability distributions and , respectively, with , the joint entropy
can be obtained starting from the and
entropies, and additionally from the entropic functionals
and , being
the -Napier number. The composition law of the -entropy is
given in closed form, and emerges as a one-parameter generalization of the
ordinary additivity law of Boltzmann-Shannon entropy recovered in the limit.Comment: 14 page
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