22,618 research outputs found
Digital Color Imaging
This paper surveys current technology and research in the area of digital
color imaging. In order to establish the background and lay down terminology,
fundamental concepts of color perception and measurement are first presented
us-ing vector-space notation and terminology. Present-day color recording and
reproduction systems are reviewed along with the common mathematical models
used for representing these devices. Algorithms for processing color images for
display and communication are surveyed, and a forecast of research trends is
attempted. An extensive bibliography is provided
Nanostructure-modulated planar high spectral resolution spectro-polarimeter
We present a planar spectro-polarimeter based on Fabry-P{\'e}rot cavities
with embedded polarization-sensitive high-index nanostructures. A
m-thick spectro-polarimetric system for 3 spectral bands and 2 linear
polarization states is experimentally demonstrated. Furthermore, an optimal
design is theoretically proposed, estimating that a system with a bandwidth of
127~nm and a spectral resolution of 1~nm is able to reconstruct the first three
Stokes parameters \textcolor{black}{with a signal-to-noise ratio of -13.14~dB
with respect to the the shot noise limited SNR}. The pixelated
spectro-polarimetric system can be directly integrated on a sensor, thus
enabling applicability in a variety of miniaturized optical devices, including
but not limited to satellites for Earth observation
Phase-field approach to heterogeneous nucleation
We consider the problem of heterogeneous nucleation and growth. The system is
described by a phase field model in which the temperature is included through
thermal noise. We show that this phase field approach is suitable to describe
homogeneous as well as heterogeneous nucleation starting from several general
hypotheses. Thus we can investigate the influence of grain boundaries,
localized impurities, or any general kind of imperfections in a systematic way.
We also put forward the applicability of our model to study other physical
situations such as island formation, amorphous crystallization, or
recrystallization.Comment: 8 pages including 7 figures. Accepted for publication in Physical
Review
Phase-field approach to heterogeneous nucleation
We consider the problem of heterogeneous nucleation and growth. The system is
described by a phase field model in which the temperature is included through
thermal noise. We show that this phase field approach is suitable to describe
homogeneous as well as heterogeneous nucleation starting from several general
hypotheses. Thus we can investigate the influence of grain boundaries,
localized impurities, or any general kind of imperfections in a systematic way.
We also put forward the applicability of our model to study other physical
situations such as island formation, amorphous crystallization, or
recrystallization.Comment: 8 pages including 7 figures. Accepted for publication in Physical
Review
- âŠ