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UID:2026-09-21-tomoki-ichikawa@cail.columbia.edu
DTSTAMP:20260921T213313Z
DTSTART:20260921T140000Z
DTEND:20260921T150000Z
SUMMARY:Vision Seminar: Tomoki Ichikawa - Modeling and Designing Polarizat
 ion for Visual Sensing
LOCATION:Zoom and CSB 488
DESCRIPTION:Polarization is a fundamental property of light\, alongside in
 tensity and color. Unlike intensity and color\, it is invisible to the hum
 an eye and has often been overlooked. Today\, polarimetric cameras allow u
 s to readily capture linear polarization. In computer vision\, polarizatio
 n has mainly been exploited as an auxiliary cue for various tasks.\n\nRath
 er than treating polarization simply as an additional cue\, this talk expl
 ores two complementary directions: modeling polarization and designing pol
 arization. I first present two works on modeling how polarization behaves 
 in the real world. The first models outdoor polarimetric reflection to exp
 loit the unique polarization pattern of a clear sky for surface normal rec
 overy. The second introduces the Fresnel Microfacet BRDF\, a physically ba
 sed reflectance model that unifies surface and body reflections with the s
 ame microgeometry and describes both their radiometric and polarimetric be
 havior. It enables accurate reflectometry from a single polarimetric image
 .\n\nIn the final part\, I turn to designing polarization and present Stru
 ctured Polarization\, a projector-camera sensing framework that encodes il
 lumination patterns in polarization rather than in intensity or color\, as
  conventional structured light does. Since these polarization patterns are
  invisible to the human eye\, they preserve the natural appearance of the 
 target while enabling joint recovery of shape and reflectance. I first pre
 sent SPIDeRS\, which realizes this concept\, and then Spatial Polarization
  Multiplexing\, which extends it to single-shot recovery.\n\nhttps://cail.
 columbia.edu/events/2026-09-21-tomoki-ichikawa
URL:https://cail.columbia.edu/events/2026-09-21-tomoki-ichikawa
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