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TZID:Asia/Seoul
X-LIC-LOCATION:Asia/Seoul
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TZOFFSETFROM:+0900
TZOFFSETTO:+0900
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DTSTART:18871231T000000
DTSTART:19881009T020000
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BEGIN:VEVENT
DTSTAMP:20230103T035310Z
LOCATION:Room 323\, Level 3\, West Wing
DTSTART;TZID=Asia/Seoul:20221208T110000
DTEND;TZID=Asia/Seoul:20221208T111200
UID:siggraphasia_SIGGRAPH Asia 2022_sess257_gp_135@linklings.com
SUMMARY:Multifocal Stereoscopic Projection Mapping
DESCRIPTION:Talks\n\nMultifocal Stereoscopic Projection Mapping\n\nIwai\n\
 nStereoscopic projection mapping (PM) allows a user to see a three-dimensi
 onal (3D) computer-generated (CG) object floating over physical surfaces o
 f arbitrary shapes around us using projected imagery. However, the current
  stereoscopic PM technology only satisfies binocular cues and is not capab
 le of providing correct focus cues, which causes a vergence--accommodation
  conflict (VAC). Therefore, we propose a multifocal approach to mitigate V
 AC in stereoscopic PM. Our primary technical contribution is to attach ele
 ctrically focus-tunable lenses (ETLs) to active shutter glasses to control
  both vergence and accommodation. Specifically, we apply fast and periodic
 al focal sweeps to the ETLs, which causes the ``virtual image'' (as an opt
 ical term) of a scene observed through the ETLs to move back and forth dur
 ing each sweep period. A 3D CG object is projected from a synchronized hig
 h-speed projector only when the virtual image of the projected imagery is 
 located at a desired distance. This provides an observer with the correct 
 focus cues required. In this study, we solve three technical issues that a
 re unique to stereoscopic PM: (1) The 3D CG object is displayed on non-pla
 nar and even moving surfaces; (2) the physical surfaces need to be shown w
 ithout the focus modulation; (3) the shutter glasses additionally need to 
 be synchronized with the ETLs and the projector. We also develop a novel c
 ompensation technique to deal with the ``lens  breathing'' artifact that v
 aries the retinal size of the virtual image through focal length modulatio
 n. Further, using a proof-of-concept prototype, we demonstrate that our te
 chnique can present the virtual image of a target 3D CG object at the corr
 ect depth. Finally, we validate the advantage provided by our technique by
  comparing it with conventional stereoscopic PM using a user study on a de
 pth-matching task.\n\nRegistration Category: FULL ACCESS, EXPERIENCE PLUS 
 ACCESS, TRADE EXHIBITOR\n\nLanguage: ENGLISH\n\nFormat: IN-PERSON
URL:https://sa2022.siggraph.org/en/full-program/?id=gp_135&sess=sess257
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