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VISION-LIST Digest 1990 06 08
Vision-List Digest Fri Jun 08 16:37:23 PDT 90
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Today's Topics:
List of industrial vision companies
Curvature for 2-D closed boundary description
Array Technologies Color Scanner
CVGIP table of contents: Vol. 51, No. 2, August 1990
ECEM6 1991 Eye-Movements Conference, First Call
Evans & Sutherland PS390 FOR SALE!!
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Date: 4 Jun 90 19:45:50 GMT
From: Brian Palmer <bpalmer@BBN.COM>
Subject: List of industrial vision companies
Organization: Bolt Beranek and Newman Inc., Cambridge MA
Well Samir and my attempts to generate a list of Industrial Vision
companies is going slowly. Please continue to send info! I will post
the summary.
The final posting will contain all related information but for now
here is the list of companies mentioned.
Automatix
Cognex
Datacube
View Engineering (still alive?)
Adept
GMF
Intelledex
Focus Systems
Please send more names and a little info on the company. Also, if you know
anything about the above (some descriptions were short) please pass that
along too.
Thanks,
Brian
------------------------------
Date: 6 Jun 90 23:17:11 GMT
From: zeitzew@CS.UCLA.EDU (Michael Zeitzew)
Subject: Curvature for 2-D closed boundary description
Organization: UCLA Computer Science Department
From:
O. Mitchell and T. Grogan
"Global and Partial Shape Discrimination for Computer Vision"
Optical Engineering,
Volume 23, Number 5, September 1984. pg.484-491
A portion (section on the Fourier-Mellin Correlation) can
be summarized as follows :
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
If the boundary function $z(i) = x(i) + \jmath y(i)$ is twice differentiable,
the the curvature function, denoted by $\kappa(i)$ is given by :
\[ \kappa(t) = \partial / \partial t \;\; \arctan \dot{y}(t) / \dot{x}(t) \]
A discrete approximation of the curvature is :
\begin{eqnarray}
\kappa(i) = \arctan \frac{y_{i} - y_{i-1}}{x_{i} - x{i-1}} - \\
\arctan \frac{y_{i-1} - y_{i-2}}{x_{i-1} - x_{i-2}} \;\;i=0,\ldots,N-1 \nonumber
\end{eqnarray}
The curvature function provides a contour description which is invariant
under translation and rotation.....
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Does anyone know why the definition of curvature is given as the
partial derivative with respect to "time", and not "arc length" as
one would see in a first year Calculus book ? What are the
assumptions/implications here ?
If this is a stupid/obvious/boring question, I'm sorry. If you care
to e-mail me a response, thank you in advance.
Mike Zeitzew
zeitzew@lanai.cs.ucla.edu
------------------------------
Date: Thu, 7 Jun 90 10:07:32 EDT
From: marra@jargon.whoi.edu (Marty Marra)
Subject: Array Technologies Color Scanner
Does anyone have experience working with an Array Technologies Color
Scanner? Ideally I'd like to control their "image server" from my Sun
via GPIB. Any general info about these scanners would also be greatly
appreciated.
Thanks.
/\/\ /\/\ Marty Marra, Woods Hole Oceanographic Institution (WHOI DSL)
/ \ / \ Woods Hole, MA 02543 "marra@jargon.whoi.edu" (508)457-2000x3234
------------------------------
Date: Fri, 1 Jun 90 13:08:02 -0700
From: graham@cs.washington.edu (Stephen Graham)
Subject: CVGIP table of contents: Vol. 51, No. 2, August 1990
COMPUTER VISION, GRAPHICS, AND IMAGE PROCESSING .
Volume 51, Number 2, August 1990
CONTENTS
A. Huertas, W. Cole, and R. Nevatia. Detecting Runways in Complex Airport
Scenes, p. 107.
Maylor K. Leung and Yee-Hong Yang. Dynamic Strip Algorithm in Curve Fitting,
p. 146.
Josef Bigun. A Structure Feature for Some Image Processing Applications Based
on Spiral Functions, p. 166.
Lawrence O'Gorman. k x k Thinning, p. 195.
ANNOUNCEMENTS, p. 216.
ABSTRACTS OF PAPERS ACCEPTED FOR PUBLICATION, p. 217.
------------------------------
Date: Fri, 08 Jun 90 15:36:42 +0200
From: ECEM6 <FPAAS91%BLEKUL11.BITNET@CUNYVM.CUNY.EDU>
Subject: ECEM6 1991 Eye-Movements Conference, First Call
Organization: 6th European Conference on Eye Movements
6th European Conference on Eye Movements
15 - 18 september 1991
Leuven, Belgium
First Announcement & Call for Papers
AIM
This is the sixth meeting of the European Scientists actively
involved in eye movement research and is the successor to the
first meeting held in Bern (Switzerland) in 1981, an
initiative of the European Group for Eye Movement Research
(for more information on the Group: R. Groner, Laupenstrasse
4, CH-3008 Bern, Switzerland). The aim of the Conference is to
promote the wider exchange of information concerning eye
movement research in all its diverse fields, and to encourage
contact between basic and applied research. The Conference
will be of interest to psychologists, educational scientists,
neurophysiologists, medical doctors, bioengineers, ergonomists
and others interested in visual science.
VENUE
The Conference will be held at the Department of Psychology,
University of Leuven, Belgium, and many presentations will be
given in the Michotte Lecture Hall of the Department.
CALL FOR PAPERS AND POSTERS
If you wish to present a paper or a poster, please send a one-
page abstract by January 31, 1991, at the very latest. The
selection of posters or papers to be presented will be made by
a committee including all preceding organizers of E.C.E.M.
(with notifications to the proposers in April 1991). Papers
and posters on the following topics are welcome:
Neurophysiology of eye movements, oculomotor system,
measurement techniques, eye movements in perceptual and
cognitive tasks, eye movements and reading, oculomotor
disorders, and applied research. Papers integrating sensory
sciences and higher-order studies will be favored. Papers and
posters should be in English, and the presentation of the
paper should not exceed 20 minutes.
CONFERENCE PUBLICATIONS
If your paper is selected for presentation, you will be asked
to resubmit your abstract in the form specified for the
publication in the Congress Proceedings. This volume will be
made available at the beginning of the Conference. An edited
volume of selected papers will be published after the
Conference by North-Holland Publishing Company in the new
series "Studies in Visual Information Processing" (Series
Editors: R. Groner & G. d'Ydewalle).
SECOND AND FINAL CALL
The second and final call will be forwarded to all those who
submitted a paper and poster abstract. If you do not submit an
abstract and you want to receive the final call, please give
your address in the attached information sheet. The final call
will include more details on the programmes as well as
information on registration and accommodation.
The organizers of the conference will be happy to answer any
questions you may have. Our address is given here at the
bottom line of the letter.
___ __
/ / 6th European Conference on Eye Movements
/--- / 15 - 18 september 1991
/___ /____ Leuven, Belgium
___ __ __ l
/ / l / l l___ Laboratory of Experimental Psychology
/--- / l/ l l l Katholieke Unversiteit Leuven
/___ / l l___l B-3000 Leuven, Belgium
FPAAS91@BLEKUL11.EARN Presidents: Gery d'Ydewalle & Eric De Corte
tel: (32)(16) 28 59 65 Organizer: Johan Van Rensbergen
fax: (32)(16) 28 60 99 99
------------------------------
Date: Mon, 4 Jun 90 15:48:52 CDT
From: ssmith (Sean Smith)
Subject: Evans & Sutherland PS390 FOR SALE!!
Evans & Sutherland PS390 (includes):
Graphics Control processor with 2 dual-sided Floppies
2 Megabytes Memory
Display Processor
19" Color Raster Monitor
RS-232C interface
PS390 System Firmware, Host Software and License
5 Volume user set
Ethernet Interface
1 Megabyte Memory
Keyboard w/led display
Control Dials w/LED display
Tablet 6" x 6" (active area)
*****Please contact Sean Smith
(713)363-8494
ssmith@bcm.tmc.edu
Please pass this message on to interested users.
------------------------------
End of VISION-LIST
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