Reducing Motion Blur in Ghost Imaging Via the Hessian Matrix

Chen Chang,Guohua Wu,Bin Luo,Dongyue Yang,Longfei Yin

doi:10.3390/app11010323

Abstract

Different from conventional imaging, ghost imaging (GI) is an indirect modality of imaging that needs multiple measurements of the second-order correlation of data collected from two detectors. In some particular cases, the exposure time of two detectors or the rotation speed of the ground glass may not meet the need of experimental condition, resulting in motion blur that reduces the quality of the reconstructed image. In this paper, we propose a method to solve this problem. By convolving the data from the reference arm with the Hessian matrix, the intensity of the light in the data is replaced by the gradient of intensity and the influence of the motion blur in the reconstructed image can be reduced.

Highlights

IntroductionThe pseudo-thermal light produced by a laser passing through a rotating ground glass (RGG) is split into two arms by a beam splitter (BS); the arm with the illuminated object is called the signal arm and the data without spatial resolution from this arm is recorded by the bucket detector, which means that the data from the detector is the sum of all of the light intensities within the captured range of the detector
We did several experiments to simulate motion blur caused by the improper setting between the exposure time of the detectors and the coherence time
We saw motion blur in the images reconstructed by the SC and SC filtered by Lucy–Richardson, which reduced the quality of reconstructed image

Summary

Introduction

The pseudo-thermal light produced by a laser passing through a rotating ground glass (RGG) is split into two arms by a beam splitter (BS); the arm with the illuminated object is called the signal arm and the data without spatial resolution from this arm is recorded by the bucket detector, which means that the data from the detector is the sum of all of the light intensities within the captured range of the detector. When the RGG rotates through the size of the laser spot, the distribution of the laser speckle is gradually changed. Until it rotates out of the entire range of the laser spot, which corresponds to the “coherence time” of the pseudo-thermal light [3], the distribution of the laser speckle could be totally different from the original one.

Methods

Results

Conclusion