Nowadays, with huge progress in digital imaging, new image processing methods are needed to manage digital images stored on disks. Image retrieval has been one of the most challengeable fields in digital image processing which means searching in a big database in order to represent similar images to the query image. Although many efficient researches have been performed for this topic so far, t...

Spatial field correlation functions represent a key quantity for the description of mesoscopic phenomena in disordered media and the optical characterization of complex materials. Yet many aspects related to the vector nature of light waves have not been investigated so far. We study theoretically the polarization and coherence properties of electromagnetic waves produced by a dipole source in ...

The intricate biochemical processes underlying avian magnetoreception, the sensory ability of migratory birds to navigate using earth's magnetic field, have been narrowed down to spin-dependent recombination of radical-ion pairs to be found in avian species' retinal proteins. The avian magnetic field detection is governed by the interplay between magnetic interactions of the radicals' unpaired ...

more than two third of the world lands are located in arid and semi arid area including iran. unfortunately there is lack of information and consequently poor scientific studies in these areas because of the difficulties which we face for collecting data and doing field studies in such a big areas under hard situations. however, in the recent decades there has been a great progress in using rem...

The objectives are i) to characterize the ambient noise field coherence for the data recorded on the North Pacific Acoustic Laboratory (NPAL) and ii) to apply broadband, full field processing to characterize the sources in the local environment. Coherence measurements based upon field data are fundamental to understanding how the various sources of the ambient noise superimpose and lead to both...

Interference phenomenon, regarded as a manifestation of the correlation between light beams at two or more space-time points is most often used to study the coherence properties of light. The correlation function is obtained from the measurement of the interference fringes formed when light from pairs of space-time separated points in the field are allowed to interfere. This idea was first used...