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VISION-LIST Digest Volume 13 Issue 25
VISION-LIST Digest Mon Jun 06 16:24:48 PDT 94 Volume 13 : Issue 25
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Today's Topics:
!!! IMPORTANT !!! Vision List Readership Audit
Revisions to Tsai camera calibration code
Shape from shading
Helmholtz Conference
----------------------------------------------------------------------
Date: Mon, 6 Jun 1994 16:22:00 -0700
From: vislist-audit@teleos.com
Reply-to: vislist-audit@teleos.com
Errors-to: vislist-audit@teleos.com
Subject: !!! IMPORTANT !!! Vision List Readership Audit
The Vision List is distributed directly via email, through email
redistribution accounts, and via the INET/USENET newsgroup
COMP.AI.VISION . Over the years, the readership has greatly expanded,
but the distributed nature of our network distribution system does not
provide any count on the actual readership.
********************************************************************
***** PLEASE IMMEDIATELY REPLY TO vislist-audit@teleos.com SO *****
***** THAT WE MAY COUNT YOU. *****
********************************************************************
It is VERY important that you please take the moment to respond. The readership
count will be used to determine future resource requirements and available
services.
I will post the result of this readership audit when the count is in.
cheers!
phil...
------------------------------
Date: Sun, 05 Jun 94 00:16:46 -0400
From: Reg_Willson@IUS4.IUS.CS.CMU.EDU
Subject: Revisions to Tsai camera calibration code
If you obtained a copy of the Tsai calibration code from the Vision List
Archive SHAREWARE subdirectory (anonymous ftp to FTP.TELEOS.COM) before
June 5, 1994 you may want to ftp the newest revision of the code,
/VISION-LIST-ARCHIVE/SHAREWARE/CODE/CALIBRATION/TSAI-METHOD/Tsai-method-v2.1.tar.Z
This revision includes a fully self contained implementation of Roger Tsai's
camera calibration algorithm using *public domain* MINPACK optimization
routines (the code may also be built using commercial IMSL optimization
routines). Also included is a fix for a bug that reduced the accuracy of
full coplanar calibration and increased the convergence time for full
non-coplanar calibration. Finally, generic macros have been added for three
less common math routines used in the code.
Thanks to Torfi Thorhallsson (torfit@verk.hi.is) at the University of
Iceland who provided the self contained MINPACK version of the code.
Torfi also identified the coplanar calibration bug.
Thanks also to Frederic Devernay <Frederic.Devernay@sophia.inria.fr> who
submitted a unified MINPACK/IMSL/NAG version of the calibration code.
Future code revisions will likely use Fred's macros for isolating and
simplifying the interfaces to the various optimization packages. Also in
the works is a PC compatible version of the code.
Comments, suggestions, and bug reports can be directed to me at
rgwillson@mmm.com or rgw@cs.cmu.edu.
Reg Willson, 05-Jun-94
------------------------------
Date: Mon, 6 Jun 94 14:09:13 BST
From: maurizp@aifh.ed.ac.uk
Subject:
Hello,
I am a PhD student at the Dept. of Artificial Intelligence of
the University of Edinburgh.
I am interested in inferring 3-D shape descriptions from intensity images
and I would like to experiment with some shape-from-shading techniques,
either local, variational or whatsoever.
Is there anyone who knows where (FTPs or persons) I can find
an off-the-shelf program (and/or source code) for doing ready
shape-from-shading?
Obviously the program does not need to produce a perfect shape
reconstruction so any algorithm would be useful to me.
I would be most grateful to anyone giving me any information.
Thanks a lot
Maurizio Pilu
Department of Artificial Intelligence
University of Edinburgh
Scotland- UK
email: maurizp@aifh.ed.ac.uk
------------------------------
Date: Sun, 5 Jun 1994 15:18:15 +0200
From: gpo30 <gpo30@rz.uni-kiel.d400.de>
Subject: Helmholtz Conference
*************************************************************
From Codes To Cognition
Foundational Aspects of
Visual Information Processing
Centennial Conference
in Honour of Hermann v.Helmholtz
***********************************************************
University of Kiel/Germany
17.-21. July 1994
Organized by
Dieter Heyer & Rainer Mausfeld
Funded by
Deutsche Forschungsgemeinschaft
The conference will address fundamental psychological problems of
visual perception in areas such as shape from shading, stereo vision,
colour and form perception and attention. A basic theme recurring
throughout the conference will be how perceptual achievements relate
to sensory input. Since Helmholtz and his notion of "unconscious
inferences", several theoretical intuitions (e.g. the concept of
"ill-posed problems", Barlow's statistical model for the discovery
of "independent coincidences", Ullman and Koenderink's discussion
of Gibson's idea of "direct perception", Hoffman's "observer
mechanics", Shepard's ideas on resonance) concerning the principles
of perception have revolved around the attempt to bridge the gap
between the (often 'meagre') sensory input and the actual performance.
The conference will focus on attempts to theoretically understand the
interaction of
- restrictions and invariants of the physical environment,
- theoretical limiting factors of the sensory system as well as
- restrictions on the categorization and interpretation of sensory
information that have been internalized in the course of evolution.
SPEAKERS:
S.ANSTIS (San Diego), L.AREND (Princeton),
H.B.BARLOW (Cambridge), H.BUELTHOFF (Tuebingen),
M.FAHLE (Tuebingen), D.D.HOFFMAN (Irvine),
Chr.KOCH (Pasadena), J.KOENDERINK (Utrecht),
D.MACLEOD (San Diego), H.MALLOT (Tuebingen),
R.NIEDEREE (Kiel), Chr.NOTHDURFT (Goettingen),
E.POEPPEL (Muenchen), W.PRINZ (Muenchen),
V.RAMACHANDRAN (San Diego), E.SCHEERER (Oldenburg),
R.SHEPARD (Stanford), G.SPERLING (Irvine),
L.SPILLMANN (FREIBURG), S.ULLMAN (Cambridge, Mass.),
P.WHITTLE (Cambridge)
Address correspondence to:
Dieter Heyer
Rainer Mausfeld
Institute for Psychology
University of Kiel
D-24098 Kiel/Germany
Phone: +49-431-8804057
Fax: +49-431-8802975
E-mail: gpo65@rz.uni-kiel.d400.de
FORMAT OF THE CONFERENCE:
INVITED SPEAKERS ONLY, no parallel sessions, ample time for discussions.
Unlike other conferences the aim of the Helmholtz Conference will
be to present a resume of the state-of-the-art of the field and
its foundational problems and challenges. As befits the occasion,
presentations at the Helmholtz Conference will address a wider scope of
fundamental psychological problems of visual perception. Rather than
giving mere technical presentations of current empirical findings,
lectures will point out which classical questions are still unsolved,
which conceptual problems are often hidden behind apparently clear facts,
and discuss tacit assumptions of present research perspectives.
LOCATION:
The conference will take place at Kiel University, one of the oldest
German universities. Kiel is a middle sized town in the north of Germany
and nicely situated on the shores of the Baltic Sea. It just one hour
away (car, train) from Hamburg and can be reached by plane from
Frankfurt and Cologne.
CONFERENCE FEE:
Regular Registration: 250 DM
Registration for Participants
from Eastern European Countries: 125 DM
Student Registration: 62 DM
If you would like to register, please fill out the registration form
below and send it to the organizers. Please send payment (in DM only)
by cheque to the organizers or by international bank transfer
to Account Number: 25296476 (HELMHOLTZ-CONFERENCE)
Bank: Sparkasse Kiel
Branch Number: 210 501 70
ACCOMMODATION:
All invited speakers will reside in a first-class hotel right on the
shores of Kiel firth. We have managed to obtain special rates (145 DM
for a single room/190 DM for a double room) for a small additional
contingent of rooms at this hotel and these rooms will be allocated on
a first come first served basis.
Addresses of other hotels and guesthouses will be sent (by e-mail only)
on request. Since Kiel is a famous holiday and sailing resort during the
summer, it is advisable to book accommodation early.
HELMHOLTZ-CONFERENCE
University of Kiel/Germany
17.-21. July 1994
Preliminary Programme
Sunday, July 17
17.00 - 20.00 Registration at Kieler Yacht Club
Monday, July 18
9.00 - 10.00 E. Scheerer Computation and Cognition:
The Helmholtzian Legacy
10.00 - 10.30 Coffee break
Chair: Ch. Nothdurft
10.30 - 11.30 W. Prinz Perception and Action Planning
11.30 - 12.30 M. Fahle Perceptual Learning as an Adaptation
to the Environment
12.30 - 14.30 Lunch Break
Chair: H.B. Barlow
14.30 - 15.30 R.N. Shepard Experimental and Evolutionary
Determinants of Unconscious Inference
15.30 - 16.30 L. Arend Perceived Surface Properties and Subjective
Physics: Reinventions of Unconscious Inference
16.30 - 17.00 Tea Break
17.00 - 18.00 D.D. Hoffman Unconscious Inference and the
Mind/Body Problem
18.00 - 18.30 General Discussion
Tuesday, July 19
Chair: D.D. Hoffman
9.00 - 10.00 H. Buelthoff How are Three-Dimensional Objects
Represented in the Brain?
10.00 - 10.30 Coffee Break
10.30 - 11.30 S. Ullman Three Dimensional Object Recognition
11.30 - 12.30 J.J. Koenderink Pictorial Relief
12.30 - 14.30 Lunch Break
Chair: R.N. Shepard
14.30 - 15.30 H.B. Barlow Cognition as Code-Breaking
15.30 - 16.30 V.S. Ramachandran A Critique of Pure Vision
16.30 - 17.00 General Discussion
18.00 Departure for Schloss Gottorf
20.00 Conference Dinner
Wednesday, July 20
10.00 - 11.00 L. Spillmann Linking Perception to Neurons - Mechanisms
of Brain Structure and Function
11.00 - 11.30 Coffee Break
Chair: W. Prinz
11.30 - 12.30 E. Poeppel Helmholtzian Stimuli Interrupt the
Ongoing Stream of Perception
12. 30 - 13.30 Ch. Koch (Title not yet known)
13.30 - 14.30 Lunch break
Chair: H. Buelthoff
14.30 - 15.30 H. Mallot Shape from Image Intensities
15.30 - 16.30 S. Anstis Apparent Motion as a Case of
Unconscious Inference
16.30 - 17.00 General Discussion
17.30 - 19.00 Panel discussion (in German) "Zukunftsperspektiven einer
naturwissenschaftlichen Psychologie"
Thursday, July 21
Chair: L. Arend
9.00 - 10.00 D. MacLeod Brightness and Colour in Complex Displays
10.00 - 11.00 R. Niederee Implications of continuity considerations
on perceptual codes: the example of colour
11.00 - 11.30 Coffee Break
11.30 - 12.30 P. Whittle Contrast coding and Decoding:
Distinguishing the Contributions of Eye
and Brain to Colour Perception
12.30 - 14.30 Lunch Break
Chair: G. Sommer
14.30 - 15.30 G. Sperling (Title not yet known)
15.30 - 16.30 Ch. Nothdurft Preattentive and Attentive Perceptual
Processes
16.30 - 17.00 Tea Break
17.00 - 17.30 General Discussion and End of Meeting
**************************************************************************
HELMHOLTZ CONFERENCE
REGISTRATION FORM
NAME: ________________________________________________
________________________________________________
ADDRESS: ________________________________________________
________________________________________________
________________________________________________
_________________________________________________
TEL: _________________ FAX: ___________________
E-MAIL: ________________________________________________
ACCOMMODATION:
( ) I would like to book a (single/double) room
from July ____ to ____ and include in my
payment the corresponding amount for
accommodation.
( ) I will take care of accommodation myself.
PAYMENT: I enclose a cheque or a copy of the bank transfer order
for
_____ DM registration fee
_____ DM accommodation
_____ DM total.
------------------------------
End of VISION-LIST digest 13.25
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