Accession Number : AD0865413

Title :   Studies of Display Symbol Legibility. XXIV. The Relative Legibility of Special Symbols Formed from Different Matrices, and the Legibility of Overprinted Special Symbols,

Corporate Author : MITRE CORP BEDFORD MA

Personal Author(s) : Shurtleff, Donald A.

Report Date : FEB 1970

Pagination or Media Count : 39

Abstract : The relative legibility of special symbols constructed from 5 x 7, 5 x 9, 7 x 9 and 7 x 11 dot matrices was determined. The special symbols were shown to one group of operators under nearly optimal viewing conditions. For two other groups of operators, symbol quality was degraded by vertically overprinting one symbol on another. The results indicated that symbol indentification was better for the 7 x 9 matrix than for the 5 x 7 matrix for both good and degraded display conditions. Symbol overprinting greatly impaired the operators' ability to identify special symbols. (Author)

Descriptors :   (*AIR TRAFFIC CONTROL SYSTEMS, PLAN POSITION INDICATORS), (*PLAN POSITION INDICATORS, SYMBOLS), (*CATHODE RAY TUBES, SYMBOLS), CHARACTER RECOGNITION, PERFORMANCE(HUMAN), RADAR TRACKING, COMMAND AND CONTROL SYSTEMS, IDENTIFICATION.

Subject Categories : Electrooptical and Optoelectronic Devices
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE