week 6 summary – Hitesh

Importance of Stereo and Eye-Coupled Perspective for Eye-Hand Coordination in Fish Tank VR

The paper intends to investigate the importance of different kinds of depth cues in 3D perception depending upon the kind of task being performed. It also takes into account the probable advantages of head tracking for visual guided tasks.

The two depth cues being referred are motion parallax and Stereopsis. Stereoscopic depth is the information perceived through disparities – difference in relative separation between pairs of features imaged in two eyes. Whereas Motion parallax is the depth information the observer perceives when in motion relative to the environment. The paper highlights that for fine-positioning tasks involving a steady head, parallax information is not used for depth cue, and Stereoscopic depth information plays an important role.

The experiment was carried out in a Fish tank VR setup as a variant of Fitt’s law wherein subjects were asked to tap on series of cylinders of varying sizes with virtual barriers. The experiment involved controlling three Independent variables: Stereo vs non-stereo depth information, head tracking vs fixed perspective and four varying levels of Index of difficulty.  The results indicated that average time for task increased by 11% without head tracking and by 33% with Stereoscopic information, confirming that it is more advantageous than eye coupled perspective for such guided tasks. Also, the performance increased with increase in index of difficulty. Head tracking also measurably improved performance.