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Related Experiment Videos

Pixel independence: measuring spatial interactions on a CRT display

D G Pelli1

  • 1Department of Psychology, New York University, NY 10003, USA. denis@psych.nyu.edu

Spatial Vision
|January 1, 1997
PubMed
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Most Cathode Ray Tube (CRT) monitors deviate from ideal pixel independence due to hardware limitations. This study recommends two tests to assess these deviations in CRT imaging systems.

Area of Science:

  • Medical Imaging
  • Display Technology

Background:

  • Standard Cathode Ray Tube (CRT) imaging assumes independent pixel processing.
  • This model includes monitor nonlinearity (gamma function) and beam spot blurring (point-spread function).
  • Real-world CRT monitors often exhibit inadequate video bandwidth, DC restoration, and voltage regulation, compromising this assumption.

Purpose of the Study:

  • To evaluate the deviation of CRT monitors from the ideal pixel-independence model.
  • To propose practical methods for assessing CRT imaging performance.

Main Methods:

  • Analysis of standard CRT imaging assumptions.
  • Identification of hardware limitations affecting image fidelity.
  • Development of two diagnostic tests for CRT performance evaluation.

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Main Results:

  • Most CRT monitors do not meet the ideal model of independent pixel imaging.
  • Inadequate hardware performance is a primary cause of deviation.
  • The proposed tests can quantify these deviations.

Conclusions:

  • CRT imaging systems frequently deviate from the assumed pixel independence.
  • Hardware limitations necessitate careful assessment of CRT performance.
  • The recommended tests provide a means to evaluate CRT imaging accuracy.