Research towards practical applications of ghost imaging lidar system especially in longer sensing distance has been urgent recent years. In this paper we develop a to boost an extension remote imaging, where the transmission collimated pseudo-thermal beam can be improved hugely over long range and just shifting adjustable lens assembly generates wide field view suiting for short-range imaging. Based on proposed system, changing tendency illuminating view, energy density, reconstructed...

Detector noise has a significantly negative impact on ghost imaging at low light levels, especially for existing recovery algorithm. Based the characteristics of additive detector noise, method named modified compressive sensing is proposed to reduce background imposed by randomly distributed signal path. Experimental results show that, with an appropriate choice threshold value, algorithm can dramatically enhance contrast-to-noise ratio object reconstruction compared traditional and...

In an imaging system, resolution and signal-to-noise ratio (SNR) are two important indexes to characterize quality. Ghost is a novel method whose SNR affected by the speckle size. this paper, relation between size as well that in GI system analyzed detail. It shown critical resolution, resolvable minimum-separation adjacent objects, approximately equal (speckle diameter). There exists optimum when larger than object Based on our conclusion, we propose scheme enhance of using vortex beam,...

The scattering medium is usually thought to have a negative effect on the imaging process. In this paper, it shown that quality of reflective ghost (GI) in can be improved effectively when binary method used. By experimental and numerical results, proved existence just cause phenomenon, i.e., has positive GI. During process, from behaves as random noise which makes an obvious improvement.

A label-free, low-photodamage, low-cost, and in vivo high-resolution microscopic imaging technique has been challenging to develop. Ghost (GI) is a computational protocol with the spatially nonlocal property, which enables low-light imaging. Considering advantages of GI, we propose method, called ghost (HRMGI), achieve by simply demagnifying signal beam. The analytical formulas for resolution depth field (DOF) HRMGI are provided. Experimental results show that system can have 10.5 times...

We present an experimental demonstration of ghost imaging reflective objects with different surface roughness. The influence the roughness, transverse size test detector, and angle on signal-to-noise ratio (SNR) is analyzed by measuring second-order correlation light field based classical statistical optics. It shown that SNR decreases increment roughness detector’s or a decrease angle. Additionally, comparative studies between rough object smooth one under same conditions are also discussed.

The imaging environment can be destabilized for moving objects and platforms, thus leading the detection to random trembling, which is detrimental object reconstruction. In this Letter, we experimentally investigate ghost detecting trembling with temporal changing, an improvement method based on property of process proposed. It demonstrated that effective in addressing image degradation due disturbance obtaining a higher-quality object. results provide promising approach deal caused by...

A model of the collection range a bucket detector is proposed to investigate ghost imaging through turbulent atmosphere. The influence on quality discussed under different turbulence intensities. numerical results show that increases with increment in and decrease intensity. Specifically, we give critical detector, which minimum for at Additionally, comparison atmosphere vacuum provided effect imaging.

Incident angle of light source is a key factor that affects imaging resolution direct optical for reflected target. For large incident angle, it easy to form the "blind area" in which image object cannot be distinguished clearly. Using classical statistical optics, we study ghost (GI) numerically and experimentally show by measuring second-order correlation fields, ghost-image with good quality can retrieved area." Unlike transmitted imaging, affected greatly transverse size test detector,...

Continuous scene imaging is an important research goal in the field of autonomous driving, and key to ensure quality efficiency. In this paper, we propose a method for information fusion wide-field scanning ghost using local binary pattern (LBP) based on deep learning. The initial physical model formed by LBP integrated into neural network, which effectively enhances expression image texture details. Then collected bucket signals are used as labels adaptive reconstruction, enabling...

Near field airflow induced by wind is an important factor influencing imaging quality when the system placed on a moving platform with high speed, such as airborne imaging. In this Letter, ghost through environment experimentally and numerically investigated. The experiment performed tunnel, decreases velocity. simulation model of kind proposed, results match well experiments. With model, are extended into supersonic region effects factors discussed in detail, comparison between atmosphere...

Ghost imaging through inhomogeneous turbulent atmosphere along an uplink path and a downlink is studied in detail by using the numerical simulation method. Based on Hufnagel-Valley 5/7 profile model, formula of ghost slant derived used to analyze influence quality, effect from zenith angle also discussed. The results show that quality better than one, which can be explained phase modulation effect.

Abstract The vortex generated in the gas–liquid interface may appear propagation path, and shows severe disturbance to light propagation, thus affects final imaging. In this Letter, influence from on underwater ghost imaging is investigated experimentally. We find a counter-intuitive phenomenon that quality becomes worse when close target, which absolutely different typical channel disturbances, such as atmospheric turbulence scattering. This can be explained by mechanism of speckle...

The resolution limit, which characterizes the power of an optical imaging system, is defined as resolvable minimum-separation between two points. In classical imaging, limit given by Rayleigh diffraction limit. this paper, we propose a concept critical resolution, used to describe minimum separation adjacent objects that system can resolve. pseudo-thermal ghost (PGI) analyzed. To quantify develop mathematical formula from one evaluate whether prescribed object be resolved in PGI system....

The vibration is one of the important factors affecting imaging quality conventional remote sensing because relative motion between system and target can result in degradation quality. influence detector test path on reflective ghost (RGI) investigated theoretically experimentally. We analyze effects vibrating amplitude velocity. results demonstrate that microvibrations bucket have almost no impact resolution signal-to-noise ratio (SNR) RGI, i.e., caused by be overcome to some extent. Our...

The inhibition effect from the cosh-Gaussian modulated incoherent source on defocusing is investigated theoretically in lensless ghost imaging (LGI) and diffraction (LGD) systems. corresponding numerical simulations are presented to show influence of LGI LGD. Compared with widely used Gaussian source, it shown that LGD can be greatly weakened by properly adjusting modulation parameter ω source. To explain this phenomenon, analytical expression for point spread function system derived.

The influence of the incident angle on imaging quality reflective ghost is investigated through atmospheric turbulence. It shown that under mediate turbulence, small angles have almost no effect quality, while result for direct gets slightly worse. An increase leads to degradation and imaging, latter better same turbulent intensity. For large angles, image from cannot be distinguished but can obtain a relatively good image. Moreover, relationship between fidelity different intensities presented.

Wind is an important factor in environment disturbance, and the inhomogeneous distribution of wind velocity leads to random airflow, which severely affects beam propagation. In this paper, numerical experimental studies have been performed investigate behavior a laser propagating through induced by wind, main focus deflection evolution under effect velocity. The experiment with tunnel, deviates from center during propagation, process average presents increasing trend for larger airflow...

Hypersonic turbulence, causing the environment disturbance, is an important factor influencing optical propagation and communication. Based on extended Huygens-Fresnel principle second-order moments of Wigner distribution function, we have derived analytical expressions average intensity, normalized factor, mean-squared beam width Gaussian Schell-model beams in anisotropic hypersonic turbulence. The evolution properties demonstrate severe expansion quality degradation, influences source...

Ghost imaging of a moving target has been discussed in some works, and the motion is usually considered as translation. Here we report first (to our knowledge) Fourier-transform diffraction pattern for rotating reflected object lensless ghost (LGD) Hanbury Brown–Twiss (HBT) systems based on second-order intensity correlation measurement light field. Both numerical experimental results demonstrate that patterns both LGD HBT become narrower with decrease incident angle, which from rotation...