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DTSTART:19911015T033000
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BEGIN:VEVENT
DTSTAMP:20251218T030655Z
LOCATION:Meeting Room S426+S427\, Level 4
DTSTART;TZID=Asia/Hong_Kong:20251215T140400
DTEND;TZID=Asia/Hong_Kong:20251215T141500
UID:siggraphasia_SIGGRAPH Asia 2025_sess106_papers_1083@linklings.com
SUMMARY:Frame-Free Representation of Polarized Light for Resolving Stokes 
 Vector Singularities
DESCRIPTION:Shinyoung Yi (Korea Advanced Institute of Science and Technolo
 gy (KAIST), Kyung Hee University) and Jiwoong Na, Seungmin Hwang, Inseung 
 Hwang, and Min H. Kim (Korea Advanced Institute of Science and Technology 
 (KAIST))\n\nStokes parameters are the standard representation of polarized
  light intensity in Mueller calculus and are widely used in polarization-a
 ware computer graphics. However, their reliance on local frames--aligned w
 ith ray propagation directions--introduces a fundamental limitation: numer
 ical discontinuities in Stokes vectors despite physically continuous field
 s of polarized light. This issue originates from the Hairy Ball Theorem, w
 hich guarantees unavoidable singularities in any frame-dependent function 
 defined over spherical directional domains. In this paper, we overcome thi
 s long-standing challenge by introducing the first frame-free representati
 on of Stokes vectors. Our key idea is to reinterpret a Stokes vector as a 
 Dirac delta function over the directional domain and project it onto spin-
 2 spherical harmonics, retaining only the lowest-frequency coefficients. T
 his compact representation supports coordinate-invariant interpolation and
  distance computation between Stokes vectors across varying ray directions
 --without relying on local frames. We demonstrate the advantages of our ap
 proach in two representative applications: spherical resampling of polariz
 ed environment maps (e.g., between cube map and equirectangular formats), 
 and view synthesis from polarized radiance fields. In both cases, conventi
 onal frame-dependent methods produce singularity artifacts. In contrast, o
 ur frame-free representation eliminates these artifacts, improves numerica
 l robustness, and simplifies implementation by decoupling polarization enc
 oding from local frames.\n\nRegistration Category: Full Access, Full Acces
 s Supporter\n\nSession Chair: Yuchi Huo (Zhejiang University, Korea Advanc
 ed Institute of Science and Technology)\n\n
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