【作者】 孔庆楠； 王善德； 张驰； 秦伟平；

【Author】 KONG Qing-nan;WANG Shan-de;ZHANG Chi;QIN Wei-ping;State Key Laboratory on Integrated Optoelectronics,College of Electronic Science & Engineering,Jilin University;

【机构】 吉林大学电子科学与工程学院集成光电子学国家重点联合实验室；

【摘要】 研究了散斑平均尺寸对赝热光关联成像的影响。分别采用1幅二值图和1幅多灰度图作为待重构目标物体的图像,以峰值信噪比(PSNR)作为衡量指标,对重构质量进行了量化,同时从小到大选取3组不同尺寸散斑重构的图像进行了直观的对比。通过仿真实现了传统关联成像(GI)、差分关联成像(DGI)、基于压缩感知的关联成像(CGI)和基于伪逆的关联成像(PGI)4种关联成像方案。使用尺寸从小到大的多组散斑场分别对每一种方案进行重构。仿真结果表明,随着散斑平均尺寸的增大,GI、DGI和PGI重构图像的PSNR都有显著的提高,最高可达到7dB;而CGI重构图像的PSNR没有明显的提高。此外,当实验中的物臂和参考臂不完全对称时,双臂的散斑平均尺寸会有一定的偏差。4种方案重构图像的PSNR都随着偏差的增大有不同程度的下降,直至图像无法辨认。在保证重构图像可辨认的条件下,GI和DGI容许的偏差较大,CGI次之,PGI最小。更多还原

【Abstract】 The influence of speckle average size on the ghost imaging with pseudo-thermal light was investigated.A binary image and a grayscale image were used as images of an object to be reconstructed.The reconstruction quality was quantified by Peak Signal to Noise Ratio(PSNR)as the measure,while three sets of reconstructed pictures with different size speckles from small to large were compared intuitively.Four correlation imaging methods including Ghost Imaging(GI),Differential Ghost Imaging(DGI),Compressive-sensing Ghost Imaging(CGI)and Pseudo-inverse Ghost Imaging(PGI)were simulated.Then,several groups of speckle fields with a growing size were used to reconstruct respectively by these methods.The simulation result shows that the PSNRs of GI,DGI and PGI are improved to 7dB remarkable as the speckle size increasing,while the PSNR of the CGI enhances little.Besides,when the object arm and reference arm are not quite symmetrical in the experiment,the speckle size of two arms are deviated slightly.The reconstruction PSNRs of four methods are decreased as the bias increasing and indistinguishable finally.For a distinguishable reconstruction,the allowable deviations of GI and DGI could be bigger than that of the CGI,in which the PGI is the smallest.更多还原