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SUMMARY:First-person Hyperlapse Videos  - Johannes Kopf\, Microsoft Resear
 ch 
DTSTART:20141006T120000Z
DTEND:20141006T130000Z
UID:TALK54465@talks.cam.ac.uk
CONTACT:Microsoft Research Cambridge Talks Admins
DESCRIPTION:We present a method for converting first-person videos\, for e
 xample\, captured with a helmet camera during activities such as rock clim
 bing or bicycling\, into *hyperlapse* videos\, i.e.\, time-lapse videos wi
 th a smoothly moving camera. At high speed-up rates\, simple frame sub-sam
 pling coupled with existing video stabilization methods does not work\, be
 cause the erratic camera shake present in first-person videos is amplified
  by the speed-up. Our algorithm first reconstructs the 3D input camera pat
 h as well as dense\, per-frame proxy geometries. We then optimize a novel 
 camera path for the output video that passes near the input cameras while 
 ensuring that the virtual camera looks in directions that can be rendered 
 well from the input. Finally\, we generate the novel smoothed\, time-lapse
  video by rendering\, stitching\, and blending appropriately selected sour
 ce frames for each output frame. We present a number of results for challe
 nging videos that cannot be processed using traditional techniques. 
LOCATION:Auditorium\, Microsoft Research Ltd\, 21 Station Road\, Cambridge
 \, CB1 2FB
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