Pseudo-shape Sensation by Stereoscopic Projection Mapping
Pseudo-haptics employ visual information rather than active haptic devices to generate haptic sensations by exploiting a cross-modal effect in the brain between visual and haptic sensations. To date, little research has focused on pseudo-haptics in the projection mapping research field. This study investigates the effect of stereoscopic projection mapping on haptic shape perception. We developed a perspective projection mapping technique that visually deforms a physical surface and translates a finger touching the surface. Psychophysical experiments were conducted to investigate the relationship between the degree of deformation and the haptically perceived shape relative to the height and curvature radius. The results indicate that the proposed stereoscopic projection mapping technique can manipulate haptic shape sensation, i.e., perceived deformation increases as the projected deformation increases. In addition, we found that the perceived shape was in between the physical and projected shapes, and converged to both the upper and lower limits. Further analysis revealed that the pseudo-haptic sensation of the curvature radius was stronger than that of the height.