[AG-TECH] AG SIGGRAPH Session Mon 9th Nov: Video Show+
Martin Turner
Martin.Turner at manchester.ac.uk
Sun Nov 1 15:43:29 CST 2009
*** Apologies for Cross-posting ***
*** DOUBLE EVENT Day MONDAY 9th November 2009. 1pm and 2pm GMT ***
*** PS Wine available - and there is now an extra special Stereoscopic
NASA video show sequence ***
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Graham Fyffe, "Cosine Lobe Based Relighting from Gradient Illumination
Photographs"
Monday 9th November 2009, 1-2pm Room 1.10, Kilburn Building The
University of Manchester
Abstract: We present an image-based method for relighting a scene by
analytically fitting a cosine lobe to the reflectance function at each
pixel, based on gradient illumination photographs. Realistic relighting
results for many materials are obtained using a single per-pixel cosine
lobe obtained from just two color photographs: one under uniform white
illumination and the other under colored gradient illumination. For
materials with wavelength-dependent scattering, a better fit can be
obtained using independent cosine lobes for the red, green, and blue
channels, obtained from three monochromatic gradient illumination
conditions instead of the colored gradient condition. We explore two
cosine lobe reflectance functions, both of which allow an analytic fit
to the gradient conditions. One is non-zero over half the sphere of
lighting directions, which works well for diffuse and specular
materials, but fails for materials with broader scattering such as fur.
The other is non-zero everywhere, which works well for broadly
scattering materials and still produces visually plausible results for
diffuse and specular materials. Additionally, we estimate scene geometry
from the photometric normals to produce hard shadows cast by the
geometry, while still reconstructing the input photographs exactly.
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Carlye Archibeque, 2009 SIGGRAPH Computer Animation Festival, Executive
Producer "CAF (Computer Animation Festival) Screening"
Monday 9th November 2009, 2-3pm Room 1.10, Kilburn Building The
University of Manchester
Abstract: Carlye Archibeque will be presenting some of the best SIGGRAPH
animation video clips from the 2009 DVD collection. This covers a unique
set of animation from professional houses to amateur enthusiasts all of
whom have excelled in excellence. Wine will be available to help the event.
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Part of http://manchester.siggraph.org/
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Anyone wishing to view a discussion via Access Grid should note the
following. Please check the Jabber room shortly before the start of the
seminar to find if ScreenStreamer is to be used.
Virtual Venue: University of Manchester Room1:10
Jabber Room: university-of-manchester-(1.10)
(sam.ag.manchester.ac.uk)@conference.mcs.anl.gov
ScreenStreamer: Preferably use ScreenStreamer software - go to
http://www.memetic-vre.net/software/ScreenStreamer/ScreenStreamer.php
and select room "University of Manchester (1.10)" from the AGSC section.
Grab the screen feed (by clicking on it) from the screenstreamer window
and resize it - more info can be found on
http://www.memetic-vre.net/software/ScreenStreamer.
Alternatively, the screenshot (not animated) can be accessed at
http://192.150.184.66:7890 (this IP might change for some sessions -
please check Jabber).
PS the video show may not have full quality etc.
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