The Influence of Head Movement Parallax on Perceptual Performance Under Direct and TV-Displayed Conditions
Final rept. FY 1980
NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
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Previous research work in the analysis of TV-displayed information has not addressed the contribution of head movement parallax to operator performance. Horizontal head movements while viewing stereo TV produce the appearance of object displacement in direct proportion to the distance of the object from the focal plane. The direction of movement is opposite to that observed under direct-viewed conditions. This phenomenon is termed pseudo- movement parallax. The present study was designed to evaluate the influence of head motion parallax cues on measures of stereoacuity under direct-viewing and under TV-viewing conditions. Results of the study indicate that stereoacuity measured with a Howard-Dolman task is neither enhanced nor degraded by the pseudo-movement parallax cues associated with stereo TV. However, these cues have yet to be tested under conditions most likely to show enhanced performance i.e., where scene ambiguity is great, and objects are unfamiliar. A major task in future work is to assess the contribution that movement parallax has on operator performance when the TV display system is designed so that the head and the cameras are directly coupled, thus producing vertical head movement parallax cues. An analysis of the implications of this effort is presented, along with recommendations for future research.