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VISION-LIST Digest Volume 13 Issue 31
VISION-LIST Digest Fri Jul 15 13:58:46 PDT 94 Volume 13 : Issue 31
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Today's Topics:
New Vista home page on World Wide Web
Request for Sequence Imagery
Re: Curves
Looking for references on measuring curvature
Frequency Domain: Addition And Multiplication. Can you help?
Function Minimization
*Wanted* info on high speed video camera & recorder
Database for cursively handwritten words
Acquisition of motorized lenses for active vision-based navigation
Visibility map from depth map
References for Handprinted Character Segmentation
Image Matching Code
Need help getting e-mail address for D. C. Tseng & Z. Chen
Vision Position At Graz Univ. Of Technology, Austria
CFP: "Panchromatic" Color Conference
Kanizsa Lecture Announcement
----------------------------------------------------------------------
Date: Mon, 11 Jul 1994 14:23:55 UTC-0700
From: Art Pope <pope@cs.ubc.ca>
Subject: New Vista home page on World Wide Web
There is now a Vista home page for the World Wide Web (WWW) with an
overview of Vista and information about its current status. It can be
accessed using a WWW viewer such as Mosaic or lynx. The Vista home page is
http://www.cs.ubc.ca/nest/lci/vista/vista.html
(Vista is a freely-distributed software environment for computer vision
research. It is available via the Vista home page, or by anonymous FTP from
file://ftp.cs.ubc.ca/pub/local/vista.)
...Art Pope, Dept. of Computer Science, Univ. of British Columbia
------------------------------
Date: Mon, 11 Jul 94 08:19:48 BST
From: jamespd@eee.bham.ac.uk (Mr. Paul Duncan James)
Subject: Request for Sequence Imagery
Dear all,
I am currently a research student at the school of Electronic &
Electrical Engineering at Birmingham University, studying for PhD in the
area of computer vision.
Briefly, my research concerns algorithms for scene segmentation from motion.
Currently I am investigating a multiresolution pyramidal approach, based on
6 & 8 parameter affine models which incorporate the classical gradient based
optic flow constraint equation. Image regions are labelled on the basis of
their underlying motions and the algorithms are able to determine the number of
objects within the scene. Regions with similar motions are merged together on
the basis of a statistical likelihood test in a fine to coarse manner.
I have been able test these on a number of computer generated synthetic images
with reasonable results. I have not, however, been able to capture any
real motion sequences which exhibit good optic flow estimates. Has anyone
working in the area of optical flow have any useful imagery which has been
found to give good estimates in the past. I have already looked at a number
of archive sites including isy-gw.liu.se,ipl.rpi.edu, ftp.cps.msu.edu and
the vision list archives and found nothing suitable.
My requirements for a sequence would be :
* Textured reasonably planar object surfaces.
* small motion displacements between frames (1-3 pixels).
* Constant uniform illumination.
* Objects motion of translation,scaling,rotation (though any
motion is acceptable). Objects must be undergoing independant
motions not just a global motion such as scene expansion.
* five frames or more (though a minimum of 3 is acceptable)
* 256x256 pixels (however 128x128 or 512x512 is still useful)
* 2 or more scene objects.
* Preferably RAW (any header size), GIF or TIFF format.
* Preferably something you would allow me (with correct
accreditation) to include in a report.
I would be grateful of any assistance you may be able to give me.
P.D.James
School of Electronic and Electrical Engineering.
Birmingham University
Edgbaston
Birmingham
Email : jamespd@eee.bham.ac.uk
------------------------------
Date: 6 Jul 1994 00:39:02 GMT
From: prabir@cse.unl.edu (Prabir Bhattacharya)
Organization: University of Nebraska--Lincoln
Subject: Re: Curves
Vision-List@TELEOS.COM writes:
>Dear all:
>I am doing research on how vehicles negotiate curves on highways using
>image processing to analyze video tapes.
>I have already obtained the trajectories of different vehicles. As you
>can imagine, when drivers go through a curve, they usually do not
>follow the same path but choose different trajectories with different
>radius. I would like to classify and recognize the different driver's
>behaviour negotiating curves. To do this, I should define a similarity
>function that would allow me to identify to what degree two trajectories
>are similar.
>I would appreciate to hear your opinion about this matter. Do you know
>any work or bibliography about shape similarity measures in non closed
>planar curves?
Here is a partial list of papers:
B. Parsi, A. Margalit and A. Rosenfeld, Matching Polygonal Arcs, CVGIP, vol.
53, pp. 227-234 (1991).
S.K. Parui and D.D. majumdar, Shape similarity for open curves, Patt. Recog.
Lett., vol. 1, pp. 129-143 (1983).
S.K. Parui and D.D. Majumdar, How to Discriminate Shapes using the shape
vector, Patt. Recog. Lett., vol. 4, 201-204 (1986).
R.L. Kashyap and B.J. Oommen, A geometric approach to polygonal dissimilarity
and shape matching, IEEE PAMI, vol. 6, pp. 649-654 (1982).
P.J. van Otterloo, A Contour-oriented Approach to Shape Analysis, Prentice
Hall, New York, 1991.
F. Mokhtarian and A. Mackworth, Scale-based Description and Recognition of
Planar Curves, IEEE PAMI, vol. 8, pp. 34-43 (1986).
Have fun.
Prabir Bhattacharya
------------------------------
Date: Tue, 12 Jul 1994 09:34:09 -0400
From: taubin@watson.ibm.com (Gabriel Taubin)
Subject: Looking for references on measuring curvature
I am looking for references on methods to measure, or estimate,
curvature of curves and surfaces extracted from different types of
data sets, and references that make use of curvature information for
diferent purposes, such us segmentation or smoothing. In the case of
surfaces, some keywords might be : mean curvature, gaussian curvature,
principal curvatures, principal directions, second fundamental form,
and tensor of curvature. I am aware of some references on the subject,
but of course not all. I will make the resulting list available by
posting it in the Vision List.
- Gabriel Taubin
IBM T.J.Watson Research Center
P.O.Box 704
Yorktown Heights, NY 10598
Phone : (914)-784-7095
Fax : (914)-784-6307
Email : taubin@watson.ibm.com
------------------------------
Date: 14 Jul 1994 15:50:36 GMT
From: ben@vision.ethz.ch (Ben Robbins)
Subject: Frequency Domain: Addition And Multiplication. Can you help?
Organization: Swiss Federal Institute of Technology (ETHZ)
Keywords: FFT,Fourier,Frequency domain, corner detection
Hello all,
I am working on a local energy based corner detection model where
the convolutions are performed in the frequency domain, the results
transformed back into the spatial domain and then the local energy
is calculated.
The energy calculation is:
E(x,y) = sqrt( sqr(f(x,y)) + sqr(h(x,y)) )
where E is the energy, and f and h are the results of convolution of
an image with a quadrature filter pair.
I would be able to save a lot of computation if this calculation could
be performed in the freqency domain. This would require operations
to square an image as well as to add two images, in the frequency
domain.
Scaling an image is possible as this only effects the magnitude of the
image in the frequency domain and does not effect the phase but I have
not had success with anything more complicated than that.
Can anyone help me with this, or know whether it is possible?
Does anyone know of any good reference books that may be able to help?
Thanks in advance,
Ben Robbins.
email: ben@cs.uwa.edu.au or ben@ee.vision.ethz.ch
------------------------------
Date: Wed, 13 Jul 1994 16:10:01 +0200
From: Veronique MORON <moron@lai1.univ-lyon1.fr>
Subject: Function Minimization
Hello,
I have a set of N 3D points, obtained with a 3D sensor. I want
to find the parameters of the superquadric surface fitting those
points.
The equation of the superquadric surface is :
2/e2 2/e2 e2/e1 2/e1 e1
F(x,y,z)=(((x/a1) + (y/a2) ) +(z/a3) )
where a1,a2,a3 are size parameters, e1,e2 are "squareness" parameters
Then the function to minimize is F-1.
Which method can I use? What do you think of simulated annealing
method for this kind of problem ?
Thanks by advance.
MORON Veronique
Laboratoire d'Automatique Industrielle
Vision Industrielle
I.N.S.A. Batiment 303
69621 VILLEURBANNE CEDEX
FRANCE
E-MAIL:moron@lai1.univ-lyon1.fr
------------------------------
Date: 7 Jul 1994 17:26:13 GMT
From: pjswan@engin.umich.edu (Peter Swanson)
Organization: University of Michigan Engineering, Ann Arbor
Subject: *Wanted* info on high speed video camera & recorder
I am looking for information on high speed video cameras and recording
equipment for use in data collection and analysis of fast moving
objects. If you have information on this subject please contact me.
The specs are:
* frame rate at least 500 frames per second
* recording for at least 10 seconds
* single frame playback suitable for computer video capture
* B/W video sufficient, even grayscale unnecessary
The information I need is:
* Vendor contacts (phone #s, etc.)
* Price (for funding proposal)
* Special capabilities and limitations of equipment
Thanks in advance,
Peter J. Swanson | pjswan@engin.umich.edu |
PhD Candidate | controls specialist |
Electrical Engineering:Systems | impact, chaotic motion, |
University of Michigan | vibratory part orientation |
------------------------------
Date: 6 Jul 1994 12:37:05 GMT
From: kaufmann@cscs.ch (Guido Kaufmann)
Organization: Dept. of CS, University of Berne, Switzerland
Subject: Database for cursively handwritten words
We are looking for a database for the recognition of cursively handwritten words.
Can anybody help us?
With kind regards
Guido Kaufmann
PS: We are aware of the following databases
- CEDAR
- NIST
- ETL
- UNLV
- LOB
* E-Mail: kaufmann@iam.unibe.ch *
* Tel. : + 41 31 631 49 02 *
* *
* Institut fuer Informatik und * Institute of Computer Science and *
* angewandte Mathematik * Applied Mathematics *
* Universitaet Bern * University of Bern *
* Laenggass-Strasse 51 * Laenggass-Strasse 51 *
* CH-3012 Bern * CH-3012 Bern (Switzerland) *
------------------------------
Date: Mon, 11 Jul 1994 10:10:18 -0200
From: jacques@ita.cta.br
Subject: Acquisition of motorized lenses for active vision-based navigation
Hi,
We at the Control System Department of the Instituto Tecnologico de Aeronautica
(Sao Jose dos Campos, Brasil) are trying to initiate the acquisition of hardware for a research lab on active vision.
We have been trying to contact ERNITEC, a manufacturer of motorized zoom lenses,
without any success so far. Could anyone out there reading this list help us
with pointers to either ERNITEC or some other company? We are also looking for
CCD cameras compatible with this type of lens.
Any help will be much appreciated. Thanks a lot Jacques
Jacques Waldmann
CTA - ITA - IEEE
Sao Jose dos Campos - Brasil
e-mail: jacques@ita.cta.br
------------------------------
Date: Fri, 15 Jul 1994 16:18:40 -0100
From: "Rottinghuis Joep" <ROTTINGHUIS@vision.felk.cvut.cz>
Organization: Czech Technical University
Subject: Visibility map from depth map
Dear all,
At the University of Prague in the Computer Vision Lab
I am doing a project on the mutual illumination problem
arrising when recovering 3-D shapes with a range finder.
I have to compute a visibility map from a depth map.
Does anybody have any information on this subject.
Algorithms, ideas, previous studies, references, e-mail
addresses, anything is very welcome.
My e-mail is Rottinghuis.vision.felk.cvut.cz
Thanks,
Joep Rottinghuis
------------------------------
Date: Tue, 12 Jul 1994 11:12:27 -0400 (EDT)
From: vishal@nynexst.com (Vishal Misra)
Subject: References for Handprinted Character Segmentation
Hi,
We are working on an application which needs an intelligent
segmenter for touching alphanumeric handprinted (stenciled) strings.
Can anyone direct me to some relevant references - papers, books
etc. which give some kind of rules for segmenting strings into
characters.
Thanks,
Vishal
vishal@nynexst.com
NYNEX Science & Technology,
White Plains NY
------------------------------
Date: 15 Jul 1994 20:20:39 GMT
From: gelautz@icg.tu-graz.ac.at (Margrit Gelautz)
Organization: Graz University of Technology, Austria
Subject: Image Matching Code
I'm looking for code for image matching, both for industrial
applications and for remote sensing tasks.
Although any code is welcome, I'm particularly interested in
code based on
L.H. Quam, "Hierarchical Warp Stereo," in Proc. DARPA
Image Understanding Workshop, New Orleans, LA,
1984, pp. 149-155
and
S.I. Olsen, "Stereo Correspondence by Surface Reconstruction,"
IEEE Trans. Pattern Anal. Mach. Intell., vol. 12,
no. 3, pp. 309-315, March 1990
Can anybody help me?
Thanks,
Margrit
------------------------------
Date: 11 Jul 1994 15:37:06 -0400
From: jriechel@cc.gatech.edu (James Alan Riechel)
Organization: College of Computing, Georgia Tech
Subject: Need help getting e-mail address for D. C. Tseng & Z. Chen
Howdy,
In a journal paper entitled "Computing Location and Orientation of
Polyhedral Surfaces Using a Laser-Based Vision System" (IEEE Transactions on
Robotics and Automation, vol. 7, no. 6, Dec. 1991), the authors Din-Chang
Tseng and Zen Chen promise to extend their results to cylindrical surfaces.
I was unable to find any papers authored by Din-Chang and Zen Chen
that explicated this promised work. I need help contacting them. Here's the
journal footnote:
> D. C. Tsend is with the Department of Electronic Engineering, National
>Central University, Chung-Li, Taiwan, Republic of China.
> Z. Chen is with the Institute of Computer Engineering, National Chiao
>Tung University, Hsinchu, Taiwan, Republic of China.
Any help in obtaining e-mail or mail addresses for either of these
people is greatly appreciated.
Also, if you could point me towards papers that use laser striping
(a.k.a. grid coding, structured light, etc.) to acquire (1) absolute depth,
(2) orientation, and/or (3) relative depth of curved surves (in particular,
cylinders) I'd be most appreciative. I include my "working bibliography"
at the end of this message.
Thank you in advance,
James Riechel
jriechel@cc.gatech.edu
References
[xx] Din-Chang Tseng and Zen Chen, "Computing Location and Orientation of
Polyhedral Surfaces Using a Laser-Based Vision System," _IEEE
Transactions on Robotics and Automation_, vol. 7, no.6, Dec. 1991,
pp. 842-8.
[xx] Ernst Baumgartner and George Saridis, "A Ranging Method Based on
Triangulation for Robotic Control," ?
[xx] Gerald J. Agin, "Calibration and Use of a Light Stripe Range Sensor
Mounted on the Hand of a Robot," _IEEE Conference on Robotics and
Automation_, 1985, pp. 680-5.
[xx] Keiichi Kemmotsu and Takeo Kanade, "Sensor Placement Design for
Object Pose Determination with Three Light-Stripe Range Finders,"
School of Computer Science, Carhegie Mellon University, Technical
Peport CMU-CS-94-152, 1994.
[xx] Steven J. Gordon and Warren P. Seering, "Real-Time Part Position
Sensing," _IEEE Transactions on Pattern Analysis and Machine
Intelligence_, vol. 10, no.3, May 1988, pp. 374-86.
[xx] Charles Thorpe, Martial H. Herbert, Takeo Kanade, and Steven A.
Shafer, "Vision and Navigation for the Carnegie-Mellon Navlab,"
_IEEE Transactions on Pattern Analysis and Machine Intelligence_,
vol. 10, no. 3, May 1988, pp. 362-73.
[xx] David Nitzan, "Three-Dimensional Vision Structure for Robot
Applications," _IEEE Transactions on Pattern Analysis and Machine
Intelligence_, vol. 10, no.3, May 1988, pp. 291-309.
[xx] Yoshiaki Shirai, "Recognition of Polyhedrons with a Range Finder,"
_Pattern Recognition_, vol. 4, 1972, pp. 243-50.
[xx] Masaki Oshima and Yoshiaki Shirai, "Object Recognition Using Three-
Dimensional Information," _IEEE Transactions on Pattern Analysis
and Machine Intelligence_, vol. PAMI-5, no. 4, July 1983, pp. 353-61.
[xx] R. A. Jarvis, "A Perspective on Range Finding Techniques for Computer
Vision," _IEEE Transactions on Pattern Analysis and Machine
Intelligence_, vol. PAMI-5, no. 2, March 1983, pp. 122-39.
[xx] Y. F. Wang, A. Mitiche, and J. K. Aggarwal, "Computation of Surface
Orientation and Structure of Objects Using Grid Coding," _IEEE
Transactions on Pattern Analysis and Machine Intelligence_, vol.
PAMI-9, no. 1, Jan. 1987, pp. 129-37.
[xx] K. L. Boyer and A. C. Kak, "Color-Encoded Structured Light for Rapid
Active Ranging," _IEEE Transactions on Pattern Analysis and Machine
Intelligence_, vol. PAMI-9, no. 1, Jan. 1987, pp. 14-28.
[xx] Gongzhu Hu and George Stockman, "3-D Surface Solution Using Structured
Light and Constraint Propagation," _IEEE Transactions on Pattern
Analysis and Machine Intelligence_, vol. 11, no. 4, Apr. 1989, pp.
390-402.
[xx] R. J. Popplestone, et. al., "Forming models of Plane-and-Cylinder
Faceted Bodies from Light Stripes," _Fourth International Joint
Conference on Artificial Intelligence, Tbilisi, Georgia, USSR, Aug.
1975, pp. 664-8.
[xx] Zen Chen, Din-Chang Tseng, and Jenn-Yee Lin, "A Simple Vision
Algorithm for 3-D Position Determination Using a Single Calibration
Object," _Pattern Recognition_, vol. 22, no. 2, 1989, pp. 173-87.
[xx] Shimon Y. Nof (editor), _Handbook of Industrial Robotics_. John
Wiley & Sons: New York, 1985.
------------------------------
Date: Thu, 14 Jul 94 14:55:36 +0200
From: api@prip.tuwien.ac.at (Axel Pinz)
Subject: Vision Position At Graz Univ. Of Technology, Austria
A position in Computer Vision is presently available at Graz University of
Technology (Austria), Inst. of Computer Graphics (head: Prof. Franz Leberl).
A Post-doctoral candidate is preferred, but the position is also open for
pre-doctoral candidates.
The successful applicant will participate in an Austrian research programme
entitled "Theory and Applications of Digital Image Processing and Pattern
Recognition" funded by the Austrian science foundation (FWF). 12 different
institutions all over Austria cooperate within the framework of this grant.
Our task deals with the topic of "Information Fusion in Image Understanding"
and aims at the development of a model called "Active Fusion". Applications
of the fusion model will be in the areas of medical image processing and Remote Sensing, as well as 3D object recognition and modelling. Candidates for the
position should have proven skills in several of the following:
* representation: images, intermediate symbolic, symbolic
* fusion of information at all levels: signal, pixel, feature, symbol
* object models
* control systems
* lisp (CLOS) and/or C++ programming
* probability theory and statistics
A two year position, probably renewable for another 3 years, is offered. The
starting date is on or after September 1, 1994.
Applicants should have a strong record in Vision research. Applications should
include a resume and the name of at least one referee and should be sent to:
Dr. Axel Pinz
Inst. of Computer Graphics
Graz Univ. of Technology
Muenzgrabenstr. 11
A-8010 Graz, Austria
email: pinz@icg.tu-graz.ac.at
------------------------------
Date: Tue, 12 Jul 94 14:38:07 -0400
Subject: CFP: "Panchromatic" Color Conference
From: Steven_Shafer@IUS5.IUS.CS.CMU.EDU
CALL FOR PAPERS: ISCC PAN-CHROMATIC CONFERENCE
Williamsburg, Virginia 12-15 February 1995
The Inter-Society Color Council (ISCC) is sponsoring the First Pan-Chromatic
Conference, to provide a forum for people in all areas of color science to come
together, exchange news and ideas about color measurement and use, and form a
Color Community that transcends the traditional boundaries of each area.
Presentations will cover all areas of color science, with four areas specially
featured. For each of the featured areas, there will be a tutorial overview
talk to introduce the issues of that area to researchers and practitioners in
other branches of color science, as well as selected technical presentations in
the area. Other areas not featured this year will be presented in an
Rinterdisciplinary sessionS, and there will be a panel session to allow
focussed discussion of the issues. In addition, the James Bartleson Award will
be presented to a young color scientist selected by the Colour Group of Great
Britain.
Featured areas this year will be:
Colorimetry - Organizer Mike Brill
Tutorial talk "Color and Light: More Than Meets the Eye" by Danny Rich
Color Vision - Organizer Joel Pokorny
Tutorial talk "Mechanisms of Color Vision" by Peter Lennie
Color Machine Vision - Organizer Steve Shafer
Tutorial talk "Color in Machine Perception" by Steve Shafer
Color Computer Graphics - Organizer Gary Meyer
Tutorial talk "Color Synthesis in Computer Graphics" by Gary Meyer
Williamsburg, the traditional site for February ISCC conferences, is the
location of Colonial Williamsburg, a reconstructed town from the Colonial era,
with many fine restaurants in the area. The conference will be held at the
Williamsburg Lodge, with a special conference rate for rooms. There will be an
on-site banquet dinner on Tuesday, February 14, to celebrate the Bartleson
Award.
Submissions are invited in all areas of color science, especially but not
limited to the four feature areas. Each submission should include a title, the
authorsU names, and an abstract of not more than 200 words. Contact information
should include daytime telephone number, FAX number, and, if available, an
Internet e-mail address. Submissions are due by 1 September 1994, and authors
will be notified of acceptance by 1 November 1994. The selected speakers may
submit a one-page extended abstract by 1 December 1994; these will be collected
into a booklet to be distributed at the conference. A special issue of Color:
Research and Application journal will be reserved for papers submitted by the
speakers at the Pan-Chromatic Conference. Both the conference submissions and
journal papers will be subject to scientific review before acceptance.
The conference organizers are Mike Brill and Steve Shafer; local arrangements
chair is Romesh Kumar. Please send submissions by hard-copy, FAX, or Internet
e-mail to:
Steve Shafer Phone: 412-268-2527
Computer Science Department FAX: 412-268-6704
Carnegie-Mellon University Internet e-mail: sas@cs.cmu.edu
Pittsburgh PA 15213
Registration information and final program will be available in November 1994.
------------------------------
Date: Mon, 11 Jul 1994 03:59:25 GMT
From: Marco Bertamini <mb2p@fermi.clas.virginia.edu>
Organization: University of Virginia
Subject: Kanizsa Lecture Announcement
ANNOUNCEMENT
The Trieste Symposium on Perception and Cognition
scientific organizer: Walter Gerbino
and
**************************************************************
THE SECOND KANIZSA LECTURE
Ken Nakayama
Visual surface representation:
A missing link between early and high level vision
Department of Psychology Trieste, October 14 1994
**************************************************************
Following a tradition established by Gaetano Kanizsa, Italian
experimental psychologists have met every year at the Department
of Psychology of the University of Trieste to discuss issues in
"Perception and Cognition". In the recent years, the meeting has
expanded to include foreign guests and to accommodate talks in
English. This year the meeting is scheduled to begin on
Thursday, October 13, at 3:00 p.m. and will end on Saturday,
October 15,at 1:00 p.m. Since 1993, to honor the memory of the
late Gaetano Kanizsa the meeting also includes the "Kanizsa
Lecture". This year, Ken Nakayama, Harvard University, will
speak on "Visual surface representation: A missing link between
early and high level vision". The lecture will be held at
4:00 p.m. on Friday, October 14.
For further information on attending the lecture or for
participating in the symposium (or both):
Nicola Bruno
Department of Psychology Tel. +39 - 40 - 6767356
University of Trieste FAX +39 - 40 - 312272
Via dell'Universita', 7 e-mail: brunon@univ.trieste.it
34123 TRIESTE Italy
------------------------------
End of VISION-LIST digest 13.31
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