Analysis of Image Smear in CRT Displays Due to Scan Rate and Phosphor Persistence

Abstract

The increase in the use of cathode-ray-tube (CRT) displays for target detection and recognition has placed an emphasis on the ability of these displays to accurately reproduce amplitude and phase information for dynamic targets. This analysis investigates the theoretical dynamic image degradation occurring at the display as a result of the interaction between the target/ sensor relative velocity, the CRT system scan rate, and the persistence of the display phosphor. Expressions are developed to allow comparison of phosphors on the basis of modulation loss due to target/sensor motion. A model is developed which equates a target having a spatial frequency (S) and moving with a horizontal speed (V) to a stationary target with a sinusoidal varying intensity of frequency equal to SV. The model identifies phosphor persistence as a major contributor to amplitude modulation loss and predicts several image artifacts such as freezing and apparent motion reversal. Keywords: Image quality; Mathematical models; Limitations; Electrooptics; Line scan.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1982
Accession Number
ADA221095

Entities

People

  • Clarence E. Rash
  • Jacob Becher

Organizations

  • United States Army Aeromedical Research Lab

Tags

Communities of Interest

  • Biomedical
  • Sensors
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplitude Modulation
  • Biomedical Research
  • Cathode Ray Tubes
  • Classification
  • Detectors
  • Display Systems
  • Electro-Optics
  • Electron Beams
  • Electron Guns
  • Electrons
  • Engineering
  • Human Factors Engineering
  • Luminance
  • Luminescence
  • Military Research
  • New York
  • Optics

Fields of Study

  • Engineering
  • Physics

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Radar Systems Engineering.
  • Theoretical Analysis.