-
Light field rendering is a new approach to rendering from either
computer generated or real world images. A 2D array is of images
with different viewpoints and directions is used to reconstruct
views from positions other then the ones in the images.
6. General Discussion Items
- CGL group picture.
7. Action List
- UofT visit, car pooling
- CGL group picture
8. Director's Meeting
9. Seminars
COMPUTER GRAPHICS SEMINAR
-Monday, October 28, 1996
Tom Lyche, Institutt for Informatikk, University of
Oslo, will speak on ``The Sensitivity of a Spline
Function to Perturbations of the Knots''.
TIME: 3:30-4:30
ROOM: DC 1304
ABSTRACT
In many applications of splines, like design,
intersection problems, offsets, and datacompression,
the knot vector is the result of long computations or
interactive manipulations. It is then possible that
knots may be placed very close together without
actually being equal. To get a ``nicer'' knot vector,
it may then be tempting to perturb some knots a little
and in this way get a more evenly spaced knot vector,
or introduce knots that are identical instead of almost
identical. Another situation where one would like to
change knots is in lofting, where a familly of spline
curves need to be defined over a common knot vector.
In this talk we give upper limits on how much a knot
may be moved without the spline changing more than the
tolerance. Examples are provided showing that the upper
bounds are sharp.
CS COLLOQUIUM SERIES
DATE: Tuesday, October 29, 1996
TIME: 4:00 5:30 p.m.
PLACE: DC 1302
Dr. Gerard Roth
Senior Research Officer -
Visual Information Group Institute for Information Technology
Building Geometric Models using Three-dimensional Laser
Range-finder Data
At the Institute for Information Technology of the National
Research Council of Canada we have been developing laser range-
finders and applying them to a number of practical problems for
over a decade. Such sensors directly obtain three-dimensional
surface information by using a scanning laser beam. In this talk
we will first describe the principles of operation of our sensors
and show its ability to capture both geometry and colour at a
high resolution.
Then we will discuss how we take a number of range images and
build a geometric model of an object or environment. Such models
are useful in the application areas of virtual reality, robotics
and manufacturing. We are able to take registered range images
and make both parametric models, and mesh models. A parametric
model consists of spline surfaces while a mesh model consists of
many small triangular patches.
The web page http://www.iitsg.nrc.ca/~roth shows some of the
models that have been built, and
http://www.autsrv.iitsg.nrc.ca/choice.html gives an overview of
the entire project along, with some textured models. Most of the
models are in vrml form and can be displayed with most vrml
viewers.
10. Lab Cleanup (until 12:30 or 5 minutes)
Meeting
Agenda