The experiments showed that pilot's perception of symbolic information on the helmet-mounted display (HMD) depends on type of HMD (mono- or binocular), and structural complexity of the background image. Complex background extends time and increases errors in perception, particularly when monocular HMD is used. In extremely complicated visual situations (symbolic information on a background intricately structured by supposition of a TV image on real visual environment) significantly increases time and lowers precision of symbols perception no matter what the HMD type.
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