STUDIES OF DISPLAY SYMBOL LEGIBILITY. PART III. LINE SCAN ORIENTATION EFFECTS
MITRE CORP BEDFORD MA
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This report delineates effects upon letter legibility produced by horizontal, oblique, and vertical simulated linear TV scan lines. Horizontal lines were parallel to letter bases the angle between letter bases and oblique lines was 45 degrees and vertical lines were perpendicular to the letter bases. The results indicate that letter legibility, as measured by response accuracy and letter identification reaction time, is not affected to any significant degree by the scan line angle. In general, the oblique lines yielded the best legibility scores particularly for brief letter exposure times. The main finding of the study was that certain letters remain highly legible regardless of the scan line orientation used for their presentation, and, therefore, are uniquely suitable for TV display.
- Anatomy and Physiology
- Non-Radio Communications