The Effects of Perspective Distortion in Stereoscopic Video Displays
John O. Merritt
Interactive Technologies, Inc. Williamsburg, MA, USA
Robert E. Cole & Curtis Ikehara Department of Psychology
University of Hawaii Honolulu, Hawaii, USA
Abstract
The image size of an object can be kept constant regardless of distance, by adjusting the focal length of the lens. Although wide angle and telephoto lenses have been used to capture images this way photographers know from experience that the images are not equivalent. Specifically, the difference lies with distortions of regard relative to perspective of the imaging device. In remote orthostereoscopic view the focal length of the camera lenses and intercamera distance is closely matched to that of the viewing system and the human viewer. In teleoperation it is not uncommon to attempt to recreate the same view from a greater distance by using a longer focal length lens and a corresponding larger intercamera separation. This attempt to recreate the view from a distant perspective will distort the perceptual space of the manipulator operator. In this study the rapid sequential positioning task is used to compare manipulator performance under the orthostereoscopic perspective with that obtained using a longer focal length perspective and corresponding intercamera separation. Results will provide estimates of the effects of such perspective distortions on teleoperator performance with stereoscopic displays.