STUDIES OF DISPLAY SYMBOL LEGIBILITY: 21. THE RELATIVE LEGIBILITY OF SYMBOLS FORMED FROM MATRICES OF DOTS
MITRE CORP BEDFORD MA
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The purpose of the study was to determine the legibility of symbols formed from matrices which contained different numbers of dot elements. A set of alphanumeric symbols was constructed from each of the following dot matrices 3 x 5, 5 x 7, 7 x 11, and 9 x 15. The four symbol sets were shown for identification to one group of operators under nearly optimal viewing conditions and to a second group under degraded viewing conditions. Both rate and accuracy of identification were recorded. The results indicate that the 5 x 7 symbols are as legible as 7 x 11 and 9 x 15 symbols for most of the conditions studied, but in one condition the 7 x 11 was more legible than the 5 x 7.
- Human Factors Engineering and Man Machine Systems
- Non-Radio Communications