Accession Number:

ADA053447

Title:

The Design of an Optimum Alphanumeric Symbol Set for Cockpit Displays.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1977-12-01

Pagination or Media Count:

106.0

Abstract:

The purpose of this study was to design an alphanumeric symbol set with improved legibility which could be implemented as a standardized set for cockpit displays. PATTERN RECOGNITION THEORY WAS APPLIED IN WHICH THE TWO-DIMENSIONAL, DISCRETE, Fourier transform was used to obtain the feature space for each symbol. Spatial lowpass filtering techniques were employed and a decision rule was used based on the maximum nearest prototype Euclidian distance between symbols. A symbol change algorithm was developed in which symbols were moved away from their two closest neighbors in the transformed domain. LincolnMitre, a highly legible font, was used as the initial prototype set. A new alphanumeric symbol set was designed with 18 changed symbols that had an overall greater distance spread between nearest neighbor symbols. The LincolnMitre and a new test set were psychophysically tested with results indicating a 9.5 better performance for the changed symbols over the original LincolnMitre symbols. Author

Subject Categories:

  • Flight Control and Instrumentation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE