Image dehazing refers to procedures that attempt to remove the haze amount in a hazy image and grant the degraded image an overall sharpened appearance to obtain a clearer visibility and smooth image. In this paper, we studied various fast dehazing techniques like Tan’s dehazing method, Fattal’s dehazing method and Kaiming He et al, dehazing method. Among these methods the Dark Channel Prior (D...

Due to environmental pollution, the climate is worsening. The fog days up to 60% of the year in inland certain segments, which it has seriously affected the marine electronic cruise normal operation and navigation safety. According to the inland video image becomes gray and lack of visibility in foggy weather conditions, and in order to remove the haze to get a clear image color and contour, th...

Since the dark channel prior (DCP)-based dehazing method is ineffective in sky area and will cause problem of too color distortion image, we propose a novel based on segmentation image fusion. We first segment according to characteristics non-sky then estimate atmospheric light transmission map DCP correct them, fuse original after contrast adaptive histogram equalization improve details inform...

PURPOSE To investigate whether retinal vessel calibre measurements on optical retinal photography are affected by light and dark exposure prior to photography and whether the vessel calibre changes during an imaging sequence of several images. METHODS Digital optical retinal photographs were obtained from 32 healthy adults in two separate image sequences of six images during 1 min; one sequen...

We consider the transmission of a single bit over the continuous-time Poisson channel with noiseless feedback. We show that to send the bit reliably requires, on the average, half the energy of a photon. In the absence of peak-power constraints this holds irrespective of the intensity of the dark current. We also solve for the energy required to send log 2 M bits.

Considering the problem of color distortion caused by the defogging algorithm based on dark channel prior, an improved algorithm was proposed to calculate the transmittance of all channels respectively. First, incident light frequency’s effect on the transmittance of various color channels was analyzed according to the Beer-Lambert’s Law, from which a proportion among various channel transmitta...

Outdoor haze has adverse impact on outdoor image quality, including contrast loss and poor visibility. In this paper, a novel dehazing algorithm based the decomposition strategy is proposed. It combines advantages of two-dimensional variational mode (2DVMD) dark channel prior. The original hazy adaptively decomposed into low-frequency high-frequency images according to frequency band by using 2...

Haze, generated by floaters (semitransparent clouds, fog, snow, etc.) in the atmosphere, can significantly degrade utilization of remote sensing images (RSIs). However, existing techniques for single image dehazing rarely consider that haze is superimposed and shadow, they often aggravate degree shadow dark region. In this paper, a RSI method based on robust light-dark prior (RLDP) proposed, wh...

To address blur and noise issues caused by airlight atmospheric scattering in nighttime imaging environment, we proposed a multi-frame image restoration method. First, the Luojia 1–01 night-light degradation model was derived. Thereafter, APSF (Atmospheric Point Spread Function) for images estimated. Improved dark channel prior sparse constraint models were used to eliminate effects ofairlight ...