We study the discrete-time Poisson channel under the constraint that its average input power (in photons per channel use) must not exceed some constant E . We consider the wideband, high-photonefficiency extreme where E approaches zero, and where the channel’s “dark current” approaches zero proportionally with E . Improving over a previously obtained first-order capacity approximation, we deriv...

Air quality monitoring in polluted environments is of great significance to human health. Traditional methods use various pieces meteorological equipment, which have limited applications complex terrains and high costs. In this paper, a novel idea put forward solve the problem air pollution urban areas. We investigate whether can be assessed visually by examining haziness photos from far distan...

Abstract Image dehazing is an increasingly widespread approach to address the degradation of images natural environment by low-visibility weather, dust and other phenomena. Advances in autonomous systems platforms have increased need for low-complexity, high-performing techniques. However, while recent learning-based image approaches significantly performance, this has often been at expense com...

PURPOSE To investigate whether cysts in diabetic macular edema are better visualized in the red channel of color fundus camera images, as compared with the green channel, because color fundus camera screening methods that emphasize short-wavelength light may miss cysts in patients with dark fundi or changes to outer blood retinal barrier. METHODS Fundus images for diabetic retinopathy photosc...

A novel Encoder-Decoder Network with Guided Transmission Map (EDN-GTM) for single image dehazing scheme is proposed in this paper. The EDN-GTM takes conventional RGB hazy conjunction its transmission map estimated by adopting dark channel prior as the inputs of network. utilizes U-Net segmentation core network and various modifications including spatial pyramid pooling module Swish activation t...

We determine the reliability exponent ( ) of the Anantharam–Verdú exponential server timing channel with service rate for all rates between a critical rate = ( 4) log 2 and the channel capacity = 1 . For rates between 0 and , we provide a random-coding lower bound ( ) and a sphere-packing upper bound ( ) on ( ). We also determine that the cutoff rate 0 for this channel equals 4, thus answering ...

The capacity and error exponent of the direct detection optical channel are considered. The channel input in a T-second interval is a waveform A(r), 0 5 t I T, which satisfies 0 I A(t) I A, and (l/r)],,%(t) dt I aA, 0 < IT 11. The channel output is a Poisson process with intensity parameter X(t) + he. ‘The quantities A and CIA represent the peak and average power, respectively, of the optical s...

Abstract Most recent learning algorithms for single image dehazing are designed to train with paired hazy and corresponding ground truth images, typically synthesized images. Real datasets can help improve performance, but tough acquire. This paper proposes an unsupervised algorithm based on GAN alleviate this issue. An end-to-end network architecture is established fed unpaired clean signifyin...

A comprehensive analysis of cosmological and collider constraints is presented for three simplified models characterised by a dark matter candidate (real scalar, Majorana fermion real vector) coloured mediator (fermion, scalar respectively) interacting with the right-handed up quark Standard Model. Constraints from direct indirect detection relic density are combined bounds originating re-inter...