A Strategy for Improving the Quality of Ghost Imaging

Abstract

A new method is proposed to improve the signal-to-noise ratio (SNR) of regions of interest (ROIs) in a ghost imaging (GI) system with uneven speckle illumination. The imaging results in a GI system can be distorted when there is an uneven distribution of light. In this study, three thin-film polarizers are used to create illumination patterns in uneven light intensity distribution. In particular, the polarizer set is loaded on the object arm only, that is, the original uniformly distributed light field is still acquired by the reference arm. This small change in the light path eliminates the distortion caused by uneven illumination while increasing the SNR of the ROI. This strategy has been confirmed in principle and through simulation and experiments.

High-Visibility Pseudothermal Light Source Based on a Cr4+ : YAG Passively Q-Switched Single-Longitudinal-Mode Laser

“…e statistical characteristics of the random fluctuation of the light field are usually measured by the normalized second-order correlation function. Given the space-time point (r 1 , t 1 ) and (r 2 , t ), the normalized second-order correlation function is defined as follows [13,14,[16][17][18]:…”

“…[4] and again attracts people attention recently. e development of the airborne three-dimensional ghost imaging LiDAR imaging motional targets require high energy, high visibility and brightness, and high-stability pseudothermal light source to avoid the attenuation during the propagation, the influence from the background radiation, and the unstable air environment [10][11][12][13]. erefore, nanosecond laser pulse with high energy becomes an ideal choice.…”