The Design of an Optimum Alphanumeric Symbol Set for Cockpit Displays.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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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
- Flight Control and Instrumentation