منابع مشابه
Polarization and anisotropy of the microwave sky.
We study the polarization-polarization and polarization-temperature correlations in standard adiabatic scenarios for structure formation. Temperature anisotropies due to gravitational potential wells and oscillations in the photon-baryon-electron uid on the surface of last scattering are each associated with a correlated polarization pattern. While thècorrelated part' of the polarization has an...
متن کاملDigital imaging of clear-sky polarization.
If digital images of clear daytime or twilight skies are acquired through a linear polarizing filter, they can be combined to produce high-resolution maps of skylight polarization. Here polarization P and normalized Stokes parameter Q are measured near sunset at one inland and two coastal sites. Maps that include the principal plane consistently show that the familiar Arago and Babinet neutral ...
متن کاملStatic Filtered Sky Color Constancy
In Computer Vision, the sky color is used for lighting correction, image color enhancement, horizon alignment, image indexing, and outdoor image classification and in many other applications. In this article, for robust color based sky segmentation and detection, usage of lighting correction for sky color detection is investigated. As such, the impact of color constancy on sky color detection a...
متن کاملFlying Drosophila Orient to Sky Polarization
Insects maintain a constant bearing across a wide range of spatial scales. Monarch butterflies and locusts traverse continents [1, 2], and foraging bees and ants travel hundreds of meters to return to their nests [1, 3, 4], whereas many other insects fly straight for only a few centimeters before changing direction. Despite this variation in spatial scale, the brain region thought to underlie l...
متن کاملPolarization singularities in the clear sky
Ideas from singularity theory provide a simple account of the pattern of polarization directions in daylight. The singularities (two near the Sun and two near the anti-Sun) are points in the sky where the polarization line pattern has index +1/2 and the intensity of polarization is zero. The singularities are caused by multiple scattering that splits into two each of the unstable index +1 singu...
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ژورنال
عنوان ژورنال: Monthly Weather Review
سال: 1921
ISSN: 0027-0644,1520-0493
DOI: 10.1175/1520-0493(1921)49<26c:caposl>2.0.co;2