[Group Home]
[Research Statement]
[Projects]
[Publications]
[Members]
Florida State Vision Group |
|
Florida State Vision Group was founded by
Dr. Xiuwen Liu at the
Florida State University
with the support from the Department and the University.
The ultimate goal of our research is to build a vision system
that is capable of performing detection and recognition of a large number of objects
in real-time
under a typical unconstrained environment.
The current goal of our group's research is to
build a machine vision system that provides
useful functionalities for variety of computer vision applications
in real time;
in speech recognition technology terms, we are seeking a system that
is equivalent to a large vocabulary, speeker independent speech recognition
real-time system.
|
|
Our Approach
Our research activities are centered around efficient representations and
inference architectures for computer vision applications.
As a concrete goal for the following few years,
we want to build a system that is capable of
detecting and recognizing 30,000 different objects in real-time. Here
30,000 is an estimate of the
human's capacity for basic-level visual categorization
given by Biederman [1].
In order to make progress toward our goal of building a machine system,
our group recently has focused on the following problems.
or real-world problems.
The main research areas of the
Florida State Vision Group at the
Florida
State University are broad areas of artificial
intelligence, focusing on computer vision and perception modeling.
Our group believes that the traditional way of
from-specific-to-generic methodology does not work because a system
specially designed under certain assumptions will fail when those
assumptions are not met. Also as shown by many perceptual phenomena,
visual perception is nonlinear. This makes many of the tools very critical
for linear systems not applicable.
It is widely accepted that a successful vision system
must have a feedback loop
between low-level modules, such as filtering, and high-level modules
such as recognition. Our current research projects build on a spectral
histogram, which can be viewed as a bottom-up feature. However,
this bottom-up feature has some distinctive properties and can be used
very effectively for classification, segmentation, and even recognition.
We view that this generic feature is necessary because without it the
system would have to search a very gigantic solution space, which
would be very inefficient.
Justifications and Philosophical Arguments
It has been a dream of many ambitious scientists to make a machine
which can "see" robustly and flexibly in a natural environment
as we human beings do.
Toward realizing the dream,
our approach is based on
our belief that a feasible vision system can only be achieved by efficient approximations
of representations and inference architectures as the computational complexity
is a key requirement.
There are several reasons that support our belief.
- The computational capacity of the universe is estimated to 10^{120} operations, known as
the Landauer-Lloyd limit [2]. Given this, any algorithm that requires computation beyond this limit
is a phantom.
- To certain extend, computer vision is not a theoretical problem.
For example, one can give an optimal solution based on a look-up table; any
intelligent agent can be modeled this way [3], which, of course, does not lead to any .
- Most effective computer vision techniques must be unique to vision applications;
this is just another way of stating the well known "no free lunch theorem" (p. 456, [4]) and
"ugly duckling theorem" (p. 461, [4]).
Reference
[1] I. Biederman, ``Recognition-by-Components: A theory of human image understanding,''
Psychological Review, vol. 94, pp. 115-147, 1987.
[2] S. Lloyd, "Computational capacity of the universe," Physical Review Letters, vol. 88, no. 23, pp. 237901-1 -
237901-4, 2002.
[3] S. Russell and P. Norvig, "Artificial intelligence: A modern approach," 2nd edition, Prentice Hall, 2003.
[4] R. O. Duda, P. E. Hart, and D. G. Stork, Pattern Classification, John Wiley & Sons, 2001.
[Group Home]
[Research Statement]
[Projects]
[Publications]
[Members]
Last modified oon June 10, 2002