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Related Experiment Video

Updated: Nov 25, 2025

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization
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Partial aperture imaging system based on sparse point spread holograms and nonlinear cross-correlations.

Angika Bulbul1, Joseph Rosen2

  • 1School of Electrical and Computer Engineering, Ben-Gurion University of the Negev, P.O. Box 653, 8410501, Beer-Sheva, Israel. angikabulbul@gmail.com.

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|December 15, 2020
PubMed
Summary

This study enhances the partial aperture imaging system (PAIS) with structural and reconstruction improvements. The modified PAIS achieves comparable imaging capabilities with significantly reduced aperture size, offering cost and weight savings.

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Area of Science:

  • Optical Imaging Systems
  • Computational Imaging
  • Superresolution Techniques

Background:

  • Partial Aperture Imaging System (PAIS) offers comparable imaging to full aperture systems with reduced area.
  • PAIS has been demonstrated as an indirect incoherent digital 3D imaging technique.
  • Previous implementation in Synthetic Marginal Aperture Revolving Telescopes (SMART) achieved superresolution with subaperture area <1% of full aperture.

Purpose of the Study:

  • To test various improvements to the Partial Aperture Imaging System (PAIS).
  • To compare the performance of modified PAIS with equivalent systems.
  • To evaluate the impact of structural and reconstruction changes on imaging capabilities.

Main Methods:

  • Structural modification: using ring-shaped coded phase subapertures distributed along the aperture boundary.
  • Coded phase mask implementation: utilizing a sparse dot pattern point response.
  • Reconstruction process enhancement: employing nonlinear correlation with optimal parameters.

Main Results:

  • Modified-PAIS demonstrates improved image quality compared to previous iterations.
  • Experimental results with reflective objects validate the extended imaging limits.
  • The system shows potential for weight and cost reduction in imaging devices, especially space telescopes.

Conclusions:

  • The improved Partial Aperture Imaging System (PAIS) offers enhanced performance.
  • Coded aperture concepts effectively extend classical imaging limitations.
  • Modified PAIS presents a viable solution for efficient and high-performance imaging applications.