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VISION-LIST Digest 1989 07 31
Vision-List Digest Mon Jul 31 10:25:00 PDT 89
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Today's Topics:
Resolution issues
Satellite Image Data
IJCAI 89 Update
color processing
defocussing & Fourier domain.
Need time sequences sampled in various ways
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Date: 21 Jul 89 22:13:53 GMT
From: muttiah@cs.purdue.edu (Ranjan Samuel Muttiah)
Subject: Resolution
Organization: Department of Computer Science, Purdue University
I am looking for reference material on that may have been written
on issues pertaining to the relationship of machine vision resolution,
accuracy, and execution time.
Please email.
Thanks
------------------------------
Date: Wed, 26 Jul 89 14:30:09-0000
From: Farzin Deravi <eederavi%pyramid.swansea.ac.uk@NSFnet-Relay.AC.UK>
Subject: Satellite Image Data
I need some satellite image data in a form portable to an IBM PC environment
for a student who is doing a project on region classification by texture. Could
you suggest where I can easily obtain such data. By "easily" I mean not
having to write letters/applications and preferably through email!
Many thanks for your help and advice.
- - - - - - - - - - - - - - - - - - - -
Farzin Deravi, | UUCP : ...!ukc!pyr.swan.ac.uk!eederavi|
Image Processing Laboratory, | JANET : eederavi@uk.ac.swan.pyr |
Electrical Engineering Dept., | voice : +44 792 295583 |
University of Wales, | Fax : +44 792 295532 |
Swansea, SA2 8PP, U.K. | Telex : 48149 |
- - - - - - - - - - - - - - - - - - - -
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Date: Wed, 26 Jul 89 15:39:06 EDT
From: dewitt@caen.engin.umich.edu (Kathryn Dewitt)
Subject: IJCAI 89 Update
CONFERENCE HIGHLIGHTS
Invited Speakers:
Koichi Furukawa, ICOT will speak Monday, August 21, at 11:10am. The title
of his talk is "Fifth Generation Computer Project: Toward a Coherent
Framework for Knowledge Information Processing and Parallel Processing".
Gerald Edelman, Rockefeller University, will speak Monday August 21,
at 2:00pm. The title of his talk is"Neural Darwinism and Selective
Recognition Automata".
E.D. Dickmanns, Universitat de Bundeswehr Munchen, will speak Wednesday,
August 23, at 11:10am. The title of his talk is "Real-Time Machine Vision
Exploiting Integrak Spatio-Temporal World Models".
Enn Tyugu, Institute of Cybernetics, USSR, will speak Thursday, August 24,
at 9:00am. The title of his talk is "Knowledge-Based Programming
Environments"
Fernado Pereira, AT&T Bell Laboratories, will speak Thursday, August 24,
at 11:10am. The title of his talk is "Interpreting Natural Language".
Geoffrey Hinton, University of Toronto, will speak Friday, August 25,
at 11:10 am. The title of his talk is "Connectionist Learning
Procedures".
Invited Panels:
THE CHALLENGE OF NEURAL DARWINISM - Monday, August 21, 4:15pm.
members: Stephen W. Smoliar(chair), Linda Smith, David Zisper,
John Hollandand George Reeke
ROBOT NAVIGATION - Tuesday, August 22, 9:00am
members: David Miller(chair), Rod Brooks, Raja Chatila,
Scott Harmon, Stan Rosenschein, Chuck Thorpe, and
Chuck Weisbin.
HIGH-IMPACT FUTURE RESEARCH DIRECTIONS FOR ARTIFICIAL INTELLIGENCE
Tuesday, August 22, 11:10am.
members: Perry Thorndyke(Chair), Raj Reddy, and Toshio Yakoi
ARTIFICIAL INTELLIGENCE and SPACE EXPLORATION - Tuesday, August 22, 2:00pm
members: Peter Friedland(chair), David Atkinson, John Muratore,
and Greg Swietek.
(HOW) IS AI IMPACTING MANUFACTURING? - Friday, August 25, 9:00am.
members: Mark Fox (chair), E.J. van de Kraatz, Dennis O'Connor,
and Karl Kempf.
------------------------------
Date: Wed, 26 Jul 89 13:35:04 MET DST
From: mcvax!irst.it!bellutta@uunet.UU.NET (Paolo Bellutta)
Subject: color processing
I have a couple of problem about color procesing.
First: What is the best way to compress 24 bit color images in 8 bit color
images but using always the same colormap? I tryed to assign 3 bits
for red and green and 2 bits for blue but the results are not very
good (the image in general has a very high contrast).
Second: I want to compute from 24 bit rgb images one image that contains
luminance information (Y = 0.299 * R + 0.587 * G + 0.114 * B) and
another image with chrominance information (C = R / (R + G)).
In parentheses I wrote what I'm using.
I found that in general the Y image has high contrast and the C
image has poor color resolution. I mean that if two sides of an object
have the same color but one is too dark, on the C image it is seen
as black.
Are there better algorithms to use?
___ ___
/ ) / )
/--- /---\
/ __ _ / _ / ) _ / / /_ /_ __
/ (_/__(_)__/__(_) /_____/ (-'__/__/__/_/__/___/___(_/_
I.R.S.T.
loc. Pante' di Povo
38050 POVO (TN)
ITALY
vox: +39 461 810105
fax: +39 461 810851
e-mail: bellutta@irst.uucp
bellutta@irst.it
------------------------------
Date: Fri, 28 Jul 89 10:27:58 +0100
From: prlb2!ronse@uunet.UU.NET (Christian Ronse)
Subject: defocussing & Fourier domain.
Suppose that one makes a picture of an image with out-of-focus lenses.
The transformation from the original image to the blurred picture is
linear and translation-invariant (I think!). What is known about the
Fourier transform of this blurring transformation, in particular on
its phase spectrum?
Christian Ronse
Internet: maldoror@prlb.philips.be
UUCP: maldoror@prlb2.uucp
ARPA: maldoror%prlb.philips.be@uunet.uu.net
maldoror%prlb2.uucp@uunet.uu.net
BITNET: maldoror%prlb.philips.be@cernvax
maldoror%prlb2.uucp@cernvax
[ This is an interesting question. Krotkov, Pentland, and Subbarao
have looked at some of these issues as they relate to computer vision
(Krotkov recently published a paper in IJCV, and Pentland in PAMI).
I assume that you mean translation-invariant in the plane (since
translation in depth is what causes the blurring). Though lens effects
undermine this (e.g., diffraction, lens defects), the plane translation
invariance seems reasonable to me.
The blur function due to defocussing is in the optics literature.
It has been approximated by some as a gaussian (which, not coincidentally,
is well-suited for analytic analysis in the Fourier domain). The spread
function differs with the wavelength of light, and this introduces
some complexities. Subbarao has addressed this issue, though I don't
know of a specific reference (he is at SUNY Buffalo).
phil... ]
------------------------------
Date: Mon, 31 Jul 89 09:46:35 PDT
From: althea!pxjim@uunet.uu.net (James Conallen)
Subject: Need time sequences sampled in various ways
Hi there,
I just recently posted a request for image sequences on comp.graphics, and
a reply from Prof. Dave Chelberg [dmc@piccolo.ecn.purdue.edu) suggested I
post on the vision list. I am looking for image sequences time sequentialy
sampled with different sampling patterns. The ones I am interested in are:
lexicographic
2:1 line interlaced
2:1 dot interlaced
bit reversed line interlaced
bit reversed dot interlaced
I prefer 256x256x256 BW images, but I'm humble.
Can you offer me any help?
-jim conallen
BITNET: pxjim@widener
UUCP: pxjim@althea
AT&T: (215)499-1050
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