Source-linked AI summary
Super-resolution far-field ghost imaging via compressive sampling
Wenlin Gong, Shensheng Han
TL;DR
Far-field imaging is diffraction-limited, while evanescent-wave super-resolution is restricted to the near field. This paper combines ghost imaging with sparse image recovery and experimentally demonstrates far-field super-resolution. In the double-slit setting, it also recovers the real-space image and diffraction pattern simultaneously.
Problem
In the Fresnel and Fraunhofer regions, diffraction limits imaging resolution, while evanescent-wave approaches to super-resolution are confined to the near field.
Source: p. 1Method
The authors combine far-field ghost imaging with compressive-sampling reconstruction that represents the image sparsely and recovers it through convex optimization.
Source: p. 2Results
GISC experimentally reconstructs images beyond the speckle-limited resolution of standard ghost imaging, including a double slit and an aperture.
Source: p. 3Takeaways & Limitations
Under the stated far-field double-slit conditions, GISC obtains the diffraction pattern and real-space image simultaneously.
Source: p. 3
Abstract
from arXiv · showhide
Much more image details can be resolved by improving the system's imaging resolution and enhancing the resolution beyond the system's Rayleigh diffraction limit is generally called super-resolution. By combining the sparse prior property of images with the ghost imaging method, we demonstrated experimentally that super-resolution imaging can be nonlocally achieved in the far field even without looking at the object. Physical explanation of super-resolution ghost imaging via compressive sampling and its potential applications are also discussed.