In this paper we present a sharpening operator for color images that is based on perceptual considerations about how human visual behaves for color scenes. Color contrast is an induction phenomenon of the visual system that varies the chromaticity of a color region depending on the color of its surround, provoking an enhanced perception of color scenes. This effect can be simulated by a sharpen...

We present RXTE observations of LMC X–2 obtained during a five-day interval in 1997 December, during which the source was radiating at a mean intensity near the Eddington limit, and strongly variable on timescales of seconds to hours. The shapes of the X-ray color-color and hardness-intensity diagrams during the observations, the presence of VLFN and HFN in the power spectra, and the high intri...

In this article the optical time division multiplexing technique for high speed point-to-point optical networks is discussed. We performed test of influence of selected types modulation formats in the optical time division multiplexing simulation model with a distance of 30 km. Additionally, this paper focuses on maximum bandwidth usage, improvement of bit error rate and the another goal is to ...

The emergence of optical Internet Things (optical-IoT) for sixth-generation (6G) networks has been envisaged to relieve the bandwidth congestion in conventional radio frequency (RF) channel, and support ever-increasing number smart devices. Among plethora device innovations deemed essential fortifying development, herein we report on visible-to-near-infrared color-conversion luminescent-dyes ba...

We report the experimental observation of strong two-color optical nonlinearity in an ultracold gas $^{85}\mathrm{Rb}$-$^{87}\mathrm{Rb}$ atom mixture. By simultaneously coupling two probe transitions $^{85}$Rb and $^{87}$Rb atoms to Rydberg states electromagnetically induced transparency (EIT) configurations, we observe significant suppression resonance for one field when second is detuned at ...

Fiber optics is the fastest and reliable means of transferring large amounts of data Optical fiber links are used for local area networks to world wide data communication. Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of light through an optical fiber. Digital optical communications explores the practical applications of this union...

A novel system of optical see-through augmented reality (AR) is proposed by making use of a holographic optical element (HOE) with full-color and lens-array functions. The full-color lens-array HOE provides see-through property with three-dimensional (3D) virtual images, for it functions as a conventional lens array only for Bragg-matched lights. An HOE recording setup was built, and it recorde...

The demands for greater spectral efficiency, higher line rate, higher channel count, greater amplifier/repeater spacing, Tb/s capacity DWDM long haul optical communication systems, efficient transmission of optical channels over long-haul optical fibre system is essential. Since the conventional Return to zero (RZ) and Non return to zero (NRZ) modulation formats suffer from dispersion and ineff...

This paper proposes improvements on the embedding and the detection watermarking techniques, aiming for improved color hardcopy watermarking using inkjet printers. We investigate informed coding along with a multibit spread spectrum modulation framework for watermarking color images to be deployed as printed media. The proposed approach aims to maximize the watermarking robustness with a modula...

Segmenting an image into semantically meaningful parts is a fundamental and challenging task in computer vision. Automatic methods are able to segment an image into coherent regions, but such regions generally do not correspond to complete meaningful parts. In this paper, we show that even a single training example can greatly facilitate the induction of a semantically meaningful segmentation o...