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Exploring the Parameter Space of Point Spread Function Determination for the Scanning Electron Microscope-Part II:

Mandy C Nevins1, Richard K Hailstone1, Eric Lifshin2

  • 1Center for Imaging Science, Rochester Institute of Technology, Rochester, NY 14623, USA.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|August 31, 2019
PubMed
Summary

Point spread function (PSF) deconvolution enhances scanning electron microscope (SEM) images by restoring blurred details. Optimal parameter selection is crucial for balancing image sharpness, noise reduction, and feature preservation.

Keywords:
deconvolutionimage restorationlow voltagepoint spread functionscanning electron microscopy

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Area of Science:

  • Microscopy
  • Image Processing
  • Materials Science

Background:

  • Scanning electron microscopy (SEM) images can be degraded by blurring, limiting resolution.
  • Point spread function (PSF) deconvolution offers a software-based solution for image restoration in SEM.
  • Accurate PSF estimation is critical for effective deconvolution.

Purpose of the Study:

  • To investigate the impact of various parameters on PSF deconvolution for SEM image restoration.
  • To determine optimal parameter settings for balancing image quality, sharpness, and noise reduction.
  • To evaluate the effectiveness of background correction in PSF deconvolution.

Main Methods:

  • PSF deconvolution applied to SEM images.
  • Systematic variation of parameters: reference particle size, PSF smoothing (K), background correction, and denoising (λ).
  • Image quality assessment through visual inspection and Fourier analysis.

Main Results:

  • PSF deconvolution generally improved image quality.
  • Denoising parameter (λ) critically affects the trade-off between sharpness and noise.
  • Background correction enhanced restoration quality, but overcorrection led to artifacts.
  • Reference particle size and K had minimal impact within tested ranges.

Conclusions:

  • PSF deconvolution is a valuable technique for SEM image enhancement.
  • Careful selection of the denoising parameter (λ) is essential for specific applications.
  • Background correction is beneficial, but requires precise implementation.
  • Automating parameter determination would improve consistency and interpretability.