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VISION-LIST Digest Volume 11 Issue 25
VISION-LIST Digest Wed Jul 15 09:30:03 PDT 92 Volume 11 : Issue 25
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Today's Topics:
Digital Cameras (summary)
Parallel algorithams for Connected Component Labelling
Edge detection for aorta segmentation
Help! for Stereo Matching Algorithm with Adaptive Window
Cooccurence matrix feature calculation
SunVision
Program to take 2D FFTs
OVR help
Retina log-polar imager
CCD sensor
POSITIONS IN DIGITAL IMAGE PROCESSING
Announcement: Wavelet Digest
Paper on Image Processing and Neural Computing
----------------------------------------------------------------------
Date: Fri, 10 Jul 92 03:20:19 -0400
From: Payman Khalili <pka@engin.umich.edu>
Subject: Digital Cameras (summary)
Some time ago, I made a posting to the vision list regarding digital
cameras. I was looking for a list of companies which make digital
cameras such that the digital image can be passed directly to a
computer. (Note that most common systems acquire a digital image,
transform the image to a TV signal (NTSC/PAL/SECAM), and once again
digitize the signal using a digitizer on the computer.)
Well, here is a summary of the results which I got:
*****
I saw an advert. for this in some magazine myself...
Photometrics, Ltd.
3440 East Britannia Dr.
Tuscon, Arizona 85706
FAX (602) 573-1944
Tel (602) 889-9933
These people make a camera which acquires a 2048x2048 pixel image
with direct digital output and 12 bits per pixel. The camera features:
* Eastman Kodak KAF-4200 CCD image sensor
* Thermoelectrically cooled camera head with 12-bit dynamic range
* A direct digital interface, plug-in programmable controller for
Mac II, 286/386 AT bus, or VME computers.
* Software for camera control, image acquisition, and calibration.
*****
Mr. David Michael (djsm@ai.mit.edu) says:
Cohu electronics' 4110 series of cameras have both an NTSC signal AND
digital 8 bit outputs. Phone number 619-277-6700.
and, on the same subject, Lisa Dron (lisa@ai.mit.edu) adds:
We have a Cohu camera which outputs digital pixel values
directly. It's pretty expensive. The camera is about $2700
and you also need an interface board to your computer. I
don't know how much that is. We built our own for interfacing
to a SPARC.
*****
Mr. Edward J. Huff (huff@mcclb0.med.nyu.edu) writes:
Princeton Instruments Inc.
3660 Quakerbridge Rd.
Trenton, NJ 08619
609-587-9797
They have the best cooled intensified CCD's but the price is high
(say $50k). They might well have some cheaper stuff.
*****
Well, that's it folks! If anyone else finds out anything else
on this topic, please let me know.
Yours truly,
Payman Khalili (pka@caen.engin.umich.edu)
------------------------------
Date: Thu, 9 Jul 92 11:12:27 EDT
From: murthy@cps.msu.edu (N. N. Murthy)
Subject: Parallel algorithams for Connected Component Labelling
Can I have refernces to parallel algorithams for computing connected component
labellings ? any public domain s/w is also welcome. Thanks & regards
N.N.Murthy
------------------------------
Date: Tue, 7 Jul 92 16:05:28 EDT
From: Stanley Birchfield <stan@ipsun.larc.nasa.gov>
Subject: Edge detection for aorta segmentation
Hello,
I have 36 cat scan images (of 12 bit resolution) taken
horizontally through the human chest, in which I'm trying to define
the boundary of the aorta. I'm looking for an edge detection scheme
to do this automatically for me. In "Computer Vision" (1982), Ballard
and Brown discuss several different methods of edge detection, and in
the section entitled "Edge Following as Graph Searching" (p. 137),
they show an example of using least maximum cost in a heuristic search
to detect the cell boundary in microscope images. And from the papers
I have read it seems that everyone who analyzes medical images uses
the heuristic search to detect edges. However, neither Ballard &
Brown nor any of these people explain the procedure in detail. They
all seem to indicate that the algorithm(s) is very common and easily
accessible, but I can't seem to find it anywhere. Can anyone help me?
Thanks in advance,
Stan Birchfield (stan@hojo.larc.nasa.gov)
------------------------------
Date: Wed, 15 Jul 1992 13:52:54 +0200
From: Jean-Luc Lotti <Jean-Luc.Lotti@sophia.inria.fr>
Subject: Help! for Stereo Matching Algorithm with Adaptive Window
Dear Users,
Can anyone give me references, articles and email addresses of people
working on "Stereo Matching Algorithm with Adaptive Window" of KANADE/OKUTOMI.
I am interested in looking at such a system to apply it to a stereo vision
algorithm for my thesis.
I would be very grateful,
Thank You.
JLL.
Already read: "A stereo matching algorithm with an adaptive window:
Theory and Experiment"
"A locaally adaptive window for signal matching"
* Jean-Luc Lotti Projet Pastis : *
* INRIA-Sophia Antipolis Phone (France)93 65 76 23 *
* 2004 route des Lucioles Email: lotti@sophia.inria.fr *
* B.P. 109 lotti@gollum.inria.fr *
* 06565 Valbonne Cedex Fax (France)93 65 76 43 *
* France *
------------------------------
Date: Sat, 11 Jul 92 11:01:39 BST
From: S.Tan@ee.surrey.ac.uk
Subject: Cooccurence matrix feature calculation
Hi all,
Would appreciate very much if anyone can direct me into a
computational less demanding way of calculating cooccurence
matrix features (ie. energy, entropy, inertia etc).
My current implementation requires hours on a Sparc2 with
the features calculation occupying a significant amount of
processing time. Any input from people who had face the same
problem would be very useful to me.
Thank you.
Tele Tan
------------------------------
Date: Wed, 8 Jul 92 13:56:39 CDT
From: fsistler@gumbo.age.lsu.edu (Fred Sistler)
Subject: SunVision
I would be interested in communicating with other people that have used Sunvision on a SUN Sparcstation. I am just starting with it, and I am having some problems.
Thanks for your help.
Fred Sistler
fsistler@gumbo.age.lsu.edu
------------------------------
Date: Sat, 11 Jul 92 18:01:24 EDT
From: ddonnell@skidmore.edu (denis donnelly)
Subject: Program to take 2D FFTs
I need to take 2D FFTs and convolutions. The images that I am
interested in have at least 512 pixels per dimension.
Is there any "good" shareware available for such images.
I have available some large VAXes, an old sun 3, and PCs and macs.
Please send responses to
donnelly@siena.bitnet
Thank you.
------------------------------
Date: Tue, 7 Jul 92 12:32:08 GMT
From: Stephen Marshall <sm@spd.eee.strathclyde.ac.uk>
Subject: Need OCR help
Optical Character Recognition- Can anyone help?
A colleague here is wanting to do some OCR,
Can anyone suggest a good lead-in paper to practical techniques?
There seem to be some very reliable systems commercially available,
does anyone know what methods they use, i.e. syntactic analysis,
matrix matching, neural nets etc.
Thanks in advance,
Dr Steve Marshall, Room R323, Tel +44 41 552 4400 ext 2199
Signal Processing Division, Fax +44 41 552 2487
Dept of Electronic and Electrical Eng.,
University of Strathclyde,
204 George Street, JANET sm@spd.eee.strathclyde.ac.uk
Glasgow, G1 1XW, SCOTLAND. or s.marshall@strath.ac.uk
------------------------------
Date: Mon, 18 May 92 15:31:28 EDT
From: kreider@axon.ee.upenn.edu (Greg Kreider)
Subject: Retina log-polar imager
At the end of our demo of the Retina log-polar imager during the DARPA
workshop last week, Dr. Van der Spiegel mentioned that we are interested
in making the camera available to research labs. As a first step, I'd
appreciate your comments to the following. We need to get a feel for
how much demand there is for the sensor.
The Retina Imager is the first log-polar camera. Its photosites lie on a
grid of 30 concentric, but exponentially growing, circles with 64 wedges
per circle. An additional 102 photodetectors on a rectangular grid sit
in the center of the focal plane. The advantages of this camera include
properties of the log-polar transform as well as a tremendous reduction
in collected data, bringing the total pixel count within the performance
range of modern computers. A Sparcstation IPX under X Windows can run
an edge detector over an image at 10-12 frames/sec (limited on our
platform by our digitizer). The camera is probably most useful in real-
time imaging and robotics applications.
The package we could provide would include:
1. a Retina CCD Imager.
2. a driving package - a custom CMOS chip generating driving
clocks and a set of amplifiers and DC regulators, mounted
on a printed circuit board.
3. A box measuring approximately 8" x 8" x (2" or 3").
4. C-mount.
5. Lens.
6. Docs.
This is a functional prototype. It runs on a single 30V power supply.
Its output signals are the analog video line and two digitization clocks
(pixel valid and frame begin, which define a slow-scan input (not ntsc
video!) for the Data Translations series of digitizers).
We have two hopes for offering this camera. The first is to gain support
for using log-polar sensors in general vision and robotic environments.
The second is to gain feedback for the next prototype. To this end we
will want to keep in close contact with any user of the system, which
will require continuing communications between our groups.
I want to emphasize again that we are not looking for actual buyers at
this time. We are instead trying to decide if we should take the final
steps of polishing the camera's packaging and fabricating more driver
boards. I appreciate your time. Also, if you have any colleagues who
might also be interested, please send them a copy of this mailing.
Sincerely,
Greg Kreider
kreider@axon.ee.upenn.edu
Department of Electrical Engineering
308 Moore
200 S. 33rd St.
Philadelphia, PA 19104
(215) 898-7116
RETINA SURVEY MAY 1992
1. Are you interested in using such a camera?
2. A back-of-the-envelop cost estimate is $2500-3000 per camera.
Is this reasonable?
Is it outside the resources of your lab?
3. What equipment do you use in your lab?
Computer?
Frame grabber?
4. Do you have C-Mount lenses available in your lab?
If not, what type do you use?
5. Do you want a lens provided with the package?
6. What features of this camera do you find attractive?
interesting?
7. To what uses can you imagine applying this sensor?
Are they among a list of your current research interests?
8. To what uses would you expect to use the camera?
9. What do you find undesirable about this system?
10. Are you willing to provide feedback about your work with the Retina?
An occasional workshop?
A periodic paper or letter?
A regular survey?
------------------------------
Date: Thu, 9 Jul 92 13:36:17 +0200
From: diaz@santiago.isdefe.es (Jose Antonio Diaz)
Subject: CCD sensor
We are looking for a CCD sensor for doing a dental application.
We would appreciate any information about any CCD sensor working
with X-ray. Does anyone known where can I buy a device like that?
We are also interested in doing the digital image goes from the CCD
directly to the computer. Does this kind of CCD camera exist?
Where can I get it?
Thanks in advance.
Please, reply by email or mail to:
Jose Antonio Diaz Bermudez email: jadiaz@santiago.isdefe.es
Edison,4 tel: 34-1-411 50 11
28006 Madrid fax: 34-1-411 47 03
SPAIN
------------------------------
Date: Tue, 7 Jul 92 20:16:23 +0300
From: pitas@cperi.forth.gr (Giannis Pitas)
Subject: POSITIONS IN DIGITAL IMAGE PROCESSING
RESEARCH POSITIONS IN DIGITAL IMAGE PROCESSING
The Department of Electrical Engineering, University of Thessaloniki
has two projects funded by European Community in Digital Image
Processing, Analysis and Coding:
1) Nonlinear and adaptive techniques for digital image processing
and computer vision (Nonlinear filtering, adaptive image filtering,
color image processing, image sequence processing, neural networks
in digital image processing) funded by ESPRIT Basic Research Action.
2) Digital stereoscopic HDTV (Stereo image coding, stereo image
analysis, medical applications) funded by RACE.
The following positions are available:
1) Two research positions for Electrical Engineers or Computer
Scientists having or being close to the completion of
Diploma or masters degree. The research done will be part of their
Ph D Thesis. Knowledge of digital image processing, computer vision,
neural networks and C is very important.
2) One postdoctoral position in digital image processing.
The salary is very good and depends on the qualifications of the
candidates. The candidates can be of any nationality, preferably
Greek or citizens of European Community countries.
The interested persons can contact Prof. I. Pitas, preferably by
fax or e-mail by sending a brief resume and list of publications
and indicating their qualifications to deal with the above mentioned
topics.
Ioannis Pitas
Assistant Professor, Department of Electrical Engineering
University of Thessaloniki, Thessaloniki 54006, PO Box 430
GREECE
Tel. +30-31-909432-39 extension 3101
Tel. +30-31-219784 (secretary)
Fax: +30-31-274868
e_mail: pitas@cperi.forth.gr
------------------------------
Date: Sat, 11 Jul 92 16:35:07 EDT
From: wavelet@isaac.math.scarolina.edu (Wavelets Mailing List)
Subject: Announcement: Wavelet Digest
We are happy to announce the
W A V E L E T D I G E S T.
Nowadays, wavelets are one of the most rapidly developing research areas
both in pure/applied mathematics and signal/image processing.
More and more people are becoming interested in using wavelets
for a broad spectrum of applications.
For researchers it is essential to stay informed on the latest
developments. Hence we are planning, here at the University of
South Carolina, to start an edited "wavelet digest."
Topics we would like to cover in our digest are:
- Announcements of:
- future wavelet conferences, call for papers, etc.
- talks on wavelets
- wavelet courses
- new preprints (and how to get them, e.g. by ftp)
- wavelet articles appearing in journals
- new books on wavelets
- wavelet-related job opportunities
- Questions (and answers) concerning:
- mathematical background of wavelets
- technical aspects of wavelets
- references
- addresses
- Regularly updated reference lists
- Reviews of recently published books on wavelets
- Posting of open problems
- Available wavelet software, where and how to get it
If you would like to subscribe to this mailing list,
send a message with "subscribe" as the subject to
wavelet@math.scarolina.edu.
If you want to submit something to the digest,
send a message with "submit" as the subject to
wavelet@math.scarolina.edu.
Please pass this message on to others who you think might be interested.
We are hoping to present the first wavelet digest to you soon.
Wim Sweldens
Bjorn Jawerth
Department of Mathematics,
University of South Carolina.
------------------------------
Date: Sat, 11 Jul 92 19:21:07 +0100
From: speeba@cardiff.ac.uk (Eduardo Bayro)
Organization: University of Wales College of Cardiff, Cardiff, Wales, UK
Subject: Paper on Image Processing and Neural Computing
Journal Systems Enginneering (1992)2; Springer Verlag
NEURAL COMPUTING FOR NOISE FILTERING, EDGE DETECTION
AND SIGNATURE EXTRACTION
D.T. Pham and E.J. Bayro-Corrochano
This paper describes two applications of neural computing
to low-level image processing. The first application concerns noise
filtering and edge detection. A neural processor employing back-
propagation multi-layer perceptrons is presented which has been shown
quantitatively to perform better than well known conventional edge
detectors. The second application is in feature extraction. A mask set
has been designed for picking up basic geometrical details of skele-
tonised contours. The use of the masks in a net which implements the
n-tuple contour analysis technique is reported.
Correspondence and offprint requests to:
D.T. Pham
e-mail: phamdt@uk.ac.cardiff
E.J. Bayro-Corrochano
e-mail: speeba@uk.ac.cardif
Intelligent Systems Research Laboratory, School of
Electrical, Electronic and Systems Engineering,
University of Wales, College of Cardiff, P.O. Box 904,
Cardiff CF1 3YH, U.K.
------------------------------
End of VISION-LIST digest 11.25
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