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Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...

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A MRI-Based Toolbox for Neurosurgical Planning in Nonhuman Primates
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Complex spatial filtering with binary masks.

B R Brown1, A W Lohmann

  • 1The IBM Corporation, ResearchDivision, San Jose, California 95114, USA.

Applied Optics
|January 6, 2010
PubMed
Summary
This summary is machine-generated.

Computer-plotted binary holograms offer a novel method for hologram creation. These binary holograms achieve image reconstruction quality comparable to traditional holograms and are effective for optical character recognition.

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Digital Image Processing

Background:

  • Traditional holograms are typically produced using interference experiments.
  • Holographic data storage and processing are areas of active research.
  • Optical matched filtering is a key technique in pattern recognition.

Purpose of the Study:

  • To investigate the feasibility of computer-generated binary holograms.
  • To evaluate the image reconstruction quality of these binary holograms.
  • To assess the performance of binary holograms as optical matched filters for character recognition.

Main Methods:

  • Holograms were generated using a computer-guided plotter, producing binary transmittance values.
  • The computer-generated plots were minified and recorded onto film.
  • The binary holograms were tested in a coherent image forming system as spatial filters.

Main Results:

  • Binary holograms yielded reconstructed images of quality comparable to conventional holograms.
  • The binary Fourier hologram functioned effectively as an optical matched filter.
  • The binary matched filter demonstrated suitability for optical character recognition tasks.

Conclusions:

  • Computer-generated binary holograms provide a viable alternative to traditional holographic methods.
  • Binary holograms offer comparable image quality and functionality as spatial filters.
  • This technique shows promise for applications in optical character recognition and beyond.