Download
stereoscopic viewing n.
Skip this Video
Loading SlideShow in 5 Seconds..
Stereoscopic Viewing PowerPoint Presentation
Download Presentation
Stereoscopic Viewing

Stereoscopic Viewing

3 Vues Download Presentation
Télécharger la présentation

Stereoscopic Viewing

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

  1. Stereoscopic Viewing Summarized by Geb Thomas

  2. Learning Objectives • Learn how to calculate retinal disparity • Understand the variety of cues that provide depth perception • Understand the main stereo viewing devices and the differences between them • Understand how to calculate important engineering parameters of stereoscopic display systems

  3. Computation of Retinal Disparity • Cormack and Fox • Images of objects nearer or farther than fixation fall on noncorresponding points on the retinas -- retinal disparity • Typically Assume that all points are on the horizontal fixation plane

  4. Fixation Angle 1 = ATN[J+Af/Df] Angle 2 = ATN[J-Af/Df] Convergence = Ang1 + Ang2

  5. Target Angle 3 = ATN[J+At/Dt] Angle 4 = ATN[J-At/Dt] ct = Ang3 + Ang4 r = angle cf - angle ct

  6. Stereoscopic Displays • “3D visual display systems for virtual environments,” McKenna and Zeltzer • Display Characteristics • 5 Display Designs

  7. Visual Cues and Display Attributes • Field of View -- angle subtended by viewing surface (human eye 120x180) • Spatial Resolution -- pixels (1280x1024 for many monitors; human has fovial region for 1-2 deg, sensitivity of 2-4 cycles/degree ~ 30 arc-sec) • Refresh and Update rates -- critical fusion frequency ~60Hz, 10-15Hz update rate for motion.

  8. Visual Cues and Display Attributes, Cont. • Brightness -- from 1-1000 mL, response follows Weber’s law at ~2% contrast. Most displays range from 2-8 to 20-60mL. • Color -- Trichromatic color reproduction is somewhat noisy process, limits range of color reproduction. • Information Rate and Bandwidth -- Human eye info rate -- 4.3Mbits/sec along nerve pathways, monitor has 2 Gbits/sec.

  9. Visual Cues and Display Attributes, Cont • Viewing Zone/ Volume Extent • Number of Views

  10. Depth Perception and Depth Cues • Stereoscopic vrs. Autostereoscopic • Oculomotor cues -- vergence and accomodation • Binocular disparity • Binocular depth resolution • Motion parallax • Pictorial Depth Cues -- Overlap, image size, linear perspective (position), texture gradient, aerial perspective, shading

  11. Stereoscopic Display

  12. Interactive Stereo

  13. Lenticular Screen/ Parallax Barrier

  14. Slice Stacking

  15. Computer-Generated Holography

  16. Learning Objectives • Learn how to calculate retinal disparity • Understand the variety of cues that provide depth perception • Understand the main stereo viewing devices and the differences between them • Understand how to calculate important engineering parameters of stereoscopic display systems