Chin. Phys. Lett.  2012, Vol. 29 Issue (7): 074216    DOI: 10.1088/0256-307X/29/7/074216
Nonlocal Imaging by Conditional Averaging of Random Reference Measurements
LUO Kai-Hong1, HUANG Bo-Qiang1, ZHENG Wei-Mou2, WU Ling-An1**
1Laboratory of Optical Physics, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190
2Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190
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We report the nonlocal imaging of an object by conditional averaging of the random exposure frames of a reference detector, which only sees the freely propagating field from a thermal light source. A bucket detector, synchronized with the reference detector, records the intensity fluctuations of an identical beam passing through the object mask. These fluctuations are sorted according to their values relative to the mean, then the reference data in the corresponding time-bins for a given fluctuation range are averaged, to produce either positive or negative images. Since no correlation calculations are involved, this correspondence imaging technique challenges our former interpretations of "ghost" imaging. Compared with conventional correlation imaging or compressed sensing schemes, both the number of exposures and computation time are greatly reduced, while the visibility is much improved. A simple statistical model is presented to explain the phenomenon.

Received: 20 June 2012      Published: 29 July 2012
PACS:  42.50.Ar  
  42.30.Va (Image forming and processing)  
  42.50.St (Nonclassical interferometry, subwavelength lithography)  
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LUO Kai-Hong, HUANG Bo-Qiang, ZHENG Wei-Mou et al  2012 Chin. Phys. Lett. 29 074216
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LUO Kai-Hong
HUANG Bo-Qiang
WU Ling-An

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