Abstract
If dynamic sensor imagery is overlaid on the view seen through the windscreen using a HUD, and if the sensor is misaligned with the pilot's eye, the resulting motion transparency can lead to systematic errors in perceiving the direction of heading. We examined whether coding misaligned, dynamic imagery in distinct colors aids pre-attentive segregation of transparent optical flow, thus eliminating errors in heading perception. Observers were shown displays overlaying radially expanding optic flow patterns with foci of expansion (FOEs) separated along the horizontal meridian and indicated the perceived direction of the FOE of one flow pattern by moving an on-screen cross-hair. We found significant repulsion errors when the angular separation between the FOEs exceeded four degrees. Further, coding the flow patterns in distinct colors did not eliminate the repulsion errors. Distinctive color coding alone appears to be insufficient for overcoming errors in heading perception induced by motion transparency.
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