FORUM ON AUGMENTED AND VIRTUAL REALITY

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Call For Participation
IEEE & ACM International Symposium on Augmented Reality 2001
ISAR'01
October 29-30, 2001
Columbia University, New York, NY
		   http://www.cs.columbia.edu/graphics/isar2001

Paper submissions due by June 5, 2001
		     				Demo submissions due by
August 5, 2001

Objectives:
ISAR'01 will provide an opportunity for Augmented Reality (AR) researchers
from academia and industry to meet in an informal atmosphere to exchange
ideas, concepts, and research results. ISAR is meant to trigger discussions
among participants and to provide an intensive exchange between academic and
industrial branches as well as between researchers working in the different
AR research areas.

History:
ISAR'01 is the fourth in a series of successful events sponsored by IEEE and
ACM in cooperation with Eurographics:
ISAR'00: International Symposium on Augmented Reality,  October 2000,
Munich, Germany
IWAR'99: International workshop on Augmented Reality,  October 1999, San
Francisco, USA
IWAR'98: October 1998, San Francisco, USA 

Topics:
*	 AR applications
*	 personal AR information systems
*	 industrial AR applications 
*	 medical AR applications
*	 AR for Architecture
*	 requirements for usable AR
*	 system architecture (software and hardware design)
*	 wearable computing
*	 performance issues (approaches for achieving real-time AR)
*	 distributed AR
*	 information presentation
*	 display hardware
*	 real-time rendering
*	 photorealistic rendering (e.g. reflection analysis)
*	 object overlay
*	 aural augmentation
*	 Diminished Reality
*	Mixed Reality
*	 sensors for position and orientation tracking
*	 calibration methods
*	 tracker registration methods
*	 tracking during user motion
*	 tracking of changes in the real world (moving objects)
*	 computer vision methods for registration
*	 acquisition of 3D scene descriptions
*	 consideration of human factors
*	 user interaction for AR (e.g. multi-modal input and output)
*	 user acceptance of AR technology

Invited Speakers:
David Hawkes       Guy's, King's & St Thomas' School of Medicine, UK
Ulrich Neumann    University of Southern California, USA
Jun Rekimoto        Sony Computer Science Laboratory, Japan

General Chairs:
Nassir Navab*	    Siemens Corporate Research, USA
Steve Feiner *	    Columbia University, USA

Program Chairs:
Ron Azuma*	   HRL Laboratories, USA
Gudrun Klinker*   	   Technische Universität München, Germany
Hideyuki Tamura*  	   Mixed Reality Laboratories, Japan

Demo Chair:
Mihran Tuceryan     	   Indiana University - Purdue University, USA

Program Committee:
Yuichiro Akatsuka	   Olympus Optical Company, Japan
Reinhold Behringer*	   Rockwell Science Center, USA
Mark Billinghurst 	   University of Washington, USA
Wolfgang Birkfellner     University of Vienna, Austria
Kostas Daniilidis 	   University of Pennsylvania, USA
Paul Devebec	   University of Southern California, USA
Anthony DiGioia	   Carnegie Mellon University, USA
Stephen Ellis   	   NASA Ames Research Center, USA
Andrew Fitzgibbon 	   University of Oxford, UK 
Eric Foxlin 	                       Intersense Inc., USA
Pascal Fua	                       Swiss Federal Institute of Tech.,
Switzerland
David Hawkes                 Guy's, King's & St Thomas' School of Medicine,
UK
Michitaka Hirose             University of Tokyo, Japan
William Hoff 	   Colorado School of Mines, USA
Tobias Höllerer	   Columbia University, New York, USA
Simon Julier	   Naval Research Laboratory, USA
Anthony Majoros	   The Boeing Company, USA
Blair MacIntyre 	   Georgia Institute of Technology, USA
David Mizell* 	   Desana Systems, California, USA
Paul Milgram 	   University of Toronto, Canada 
Stefan Müller* 	   Fraunhofer IGD, Germany 
Ulrich Neumann* 	   University of Southern California, USA
Dirk Reiners 	   Fraunhofer IGD/ZGDV, Germany
Jun Rekimoto*	   Sony Computer Science Laboratory, Japan
Albert Rizzo	   University of Southern California, USA
Dieter Schmalstieg 	   Vienna University of Technology, Austria 
Gilles Simon	   LORIA-INRIA Lorraine, France
Andrei State 	   University of North Carolina Chapel Hill, USA
Didier Stricker* 	   Fraunhofer IGD, Germany
V Sundareswaran 	   Rockwell Science Center, USA
Haruo Takemura* 	   Nara Institute of Science & Technology, Japan
Mihran Tuceryan     	   Indiana University - Purdue University, USA
Jim Vallino 	   Rochester Institute of Technology, USA
Hiroyuki Yamamoto	   Mixed Reality Systems Laboratory, Japan
Andrew Zisserman	   University of Oxford, UK 

* Member of ISAR steering committee


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Imaging and Visualization               Fax: (609) 734-6565

755 College Road East     akhamene@s ..............
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Hi,

I am a new ARToolKit user.

On this website,
(http://www.hitl.washington.edu/people/grof/SharedSpace/Download/ARToolKitPC.htm)

I've downloaded the ARToolKitPCTest.zip file and
uncompressed it.

When I double clicked on the ExCamera.exe icon, a
window appearing with live video in one corner, but
the image is not upside down. But when I double
clicked on the simple.exe icon, the image is upside
down and when I pointed my camera at the tracking
patterns I couldn't see the OpenGL primitives as
described. Was it because the image was upside down or
because of something else? Any suggestion?

For your information, I am using WIndows 2000,
Hauppauge WinTV-GO model 607, and PULNIX TM-765 camera
which is black and white.

Many thanks.

Joe.


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Hi

I'm a french student and I'm new to this board.
I'm doing an internship on augmented reality.

Right now I have a working prototype of see through AR using World ToolKit 
and a Flock of Bird for tracking purpose.

I now want to implement a prototype with camera tracking instead of electro 
magnetic.

I have really no idea how to start, any help or advice would be appreciated.

I don't have the camera yet, but it's gonna be a Sony Micro cam with a 
matrox Meteor 2. Is there a special focal length for the camera.
Will a 6mm lens be OK with ARToolkit calibration?



Thanks in advance.


Arnaud

_________________________________________________________________
Téléchargez MSN Explorer gratuitement à l'adresse 
http://explorer.msn.fr/intl.asp.

Hello

 

If I have two (or more) of the same marker and I would like to have a VRML animation for each marker, how can this be solved. I have been trying to modify the example program simpleVRML but I have not succeeded yet. 

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> 

I know that the function arDetectMarker() returns information of markers that are recognized by image processing. If there are many markers that has same pattern, this function returns information  of all same markers.

 

So I should deal with this in a way that makes it possible to show the same animation more than ones if more than one of the same marker are seen by the camera. But how? Have any of you tried this before? If yes a code sample would be really nice.

 

Best regards

 

Sune Kristensen

Hi,

I've tried to use two arDetectMarker functions using the same data pointer
to the image, but i've found that subsequent arGetTransMat calls when
also using arMultiGetTransMat on the same image doesn't work. 

For instance, i have:

while () {

	...

	// Grab a video frame
	if ((dataPtr = (ARUint8*)arVideoGetImage()) == NULL) {
		arUtilSleep(2);
		//return;
	}

	...

	if (arDetectMarkerLite(dataPtr, THRESHOLD, &locationMarkers,
			       &numLocationMarkers) < 0 &&
	    arDetectMarker(dataPtr, THRESHOLD, &entityMarkers,
			       &numEntityMarkers) < 0 ) {
		cleanup(); 
		break;
	}
	
	...

}

I've found that when using the above code, only arMultiGetTransMat can
actually detect markers. Using arGetTransMat in the same loop detects no
markers.

If i comment out the arDetectMarkerLite call, then the arGetTransMat
function returns results and correctly detects markers. Does anyone know
why this is?

Thanks.

later,
Stuart
---
email: stuart@t ............

my pointless, self-congratulatory vanity site is located here:
http://www.nontrivial.uklinux.net [http://lns.sf.net for code]

Hi,

I've tried to use two arDetectMarker functions using the same data pointer
to the image, but i've found that subsequent arGetTransMat calls when
also using arMultiGetTransMat on the same image doesn't work. 

For instance, i have:

while () {

	...

	// Grab a video frame
	if ((dataPtr = (ARUint8*)arVideoGetImage()) == NULL) {
		arUtilSleep(2);
		//return;
	}

	...

	if (arDetectMarkerLite(dataPtr, THRESHOLD, &locationMarkers,
			       &numLocationMarkers) < 0 &&
	    arDetectMarker(dataPtr, THRESHOLD, &entityMarkers,
			       &numEntityMarkers) < 0 ) {
		cleanup(); 
		break;
	}
	
	...

}

I've found that when using the above code, only arMultiGetTransMat can
actually detect markers. Using arGetTransMat in the same loop detects no
markers.

If i comment out the arDetectMarkerLite call, then the arGetTransMat
function returns results and correctly detects markers. Does anyone know
why this is?

Thanks.

later,
Stuart
---
email: stuart@t ............

my pointless, self-congratulatory vanity site is located here:
http://www.nontrivial.uklinux.net [http://lns.sf.net for code]

When you call arDetectMarker you only pass in a pointer which it then points
to its internal array of markers. The problem is that this is a global
variable and so it gets rewritten each call.

Between the two calls you need to copy out all the data that you need before
making the second call. This same problem also prevents ARToolkit from being
used within two separate threads simultaneously.

It would be really cool if the structure was passed in as an argument
(instead of global) that way there would be no re-entrancy problem and it
could be used in multiple instances easily.

regards,
Wayne

----------------------------------------------------------------------------
Wayne Piekarski - PhD Researcher / Lecturer      pho:        +61-8-8302-3669
                                                 fax:        +61-8-8302-3381
Tinmith Project - Wearable Computer Lab          mob:           0407-395-889
Advanced Computing Research Centre               ema:  wayne@c ..............
University of South Australia                    www: http://www.tinmith.net



----- Original Message -----
From: "Stuart Reeves" <str00u@c ............>
To: "ARToolkit List" <artoolkit@h ..................>
Sent: Thursday, March 06, 2003 3:17 AM


> Hi,
>
> I've tried to use two arDetectMarker functions using the same data pointer
> to the image, but i've found that subsequent arGetTransMat calls when
> also using arMultiGetTransMat on the same image doesn't work.
>
> For instance, i have:
>
> while () {
>
> ...
>
> // Grab a video frame
> if ((dataPtr = (ARUint8*)arVideoGetImage()) == NULL) {
> arUtilSleep(2);
> //return;
> }
>
> ...
>
> if (arDetectMarkerLite(dataPtr, THRESHOLD, &locationMarkers,
>        &numLocationMarkers) < 0 &&
>     arDetectMarker(dataPtr, THRESHOLD, &entityMarkers,
>        &numEntityMarkers) < 0 ) {
> cleanup();
> break;
> }
>
> ...
>
> }
>
> I've found that when using the above code, only arMultiGetTransMat can
> actually detect markers. Using arGetTransMat in the same loop detects no
> markers.
>
> If i comment out the arDetectMarkerLite call, then the arGetTransMat
> function returns results and correctly detects markers. Does anyone know
> why this is?
>
> Thanks.
>
> later,
> Stuart
> ---
> email: stuart@t ............
>
> my pointless, self-congratulatory vanity site is located here:
> http://www.nontrivial.uklinux.net [http://lns.sf.net for code]
>
>
>

When you call arDetectMarker you only pass in a pointer which it then points
to its internal array of markers. The problem is that this is a global
variable and so it gets rewritten each call.

Between the two calls you need to copy out all the data that you need before
making the second call. This same problem also prevents ARToolkit from being
used within two separate threads simultaneously.

It would be really cool if the structure was passed in as an argument
(instead of global) that way there would be no re-entrancy problem and it
could be used in multiple instances easily.

regards,
Wayne

----------------------------------------------------------------------------
Wayne Piekarski - PhD Researcher / Lecturer      pho:        +61-8-8302-3669
                                                 fax:        +61-8-8302-3381
Tinmith Project - Wearable Computer Lab          mob:           0407-395-889
Advanced Computing Research Centre               ema:  wayne@c ..............
University of South Australia                    www: http://www.tinmith.net



----- Original Message -----
From: "Stuart Reeves" <str00u@c ............>
To: "ARToolkit List" <artoolkit@h ..................>
Sent: Thursday, March 06, 2003 3:17 AM


> Hi,
>
> I've tried to use two arDetectMarker functions using the same data pointer
> to the image, but i've found that subsequent arGetTransMat calls when
> also using arMultiGetTransMat on the same image doesn't work.
>
> For instance, i have:
>
> while () {
>
> ...
>
> // Grab a video frame
> if ((dataPtr = (ARUint8*)arVideoGetImage()) == NULL) {
> arUtilSleep(2);
> //return;
> }
>
> ...
>
> if (arDetectMarkerLite(dataPtr, THRESHOLD, &locationMarkers,
>        &numLocationMarkers) < 0 &&
>     arDetectMarker(dataPtr, THRESHOLD, &entityMarkers,
>        &numEntityMarkers) < 0 ) {
> cleanup();
> break;
> }
>
> ...
>
> }
>
> I've found that when using the above code, only arMultiGetTransMat can
> actually detect markers. Using arGetTransMat in the same loop detects no
> markers.
>
> If i comment out the arDetectMarkerLite call, then the arGetTransMat
> function returns results and correctly detects markers. Does anyone know
> why this is?
>
> Thanks.
>
> later,
> Stuart
> ---
> email: stuart@t ............
>
> my pointless, self-congratulatory vanity site is located here:
> http://www.nontrivial.uklinux.net [http://lns.sf.net for code]
>
>
>

Nina H. Patel
Penn State University CO-OP
NASA Johnson Space Center
Space and Life Sciences, Human Factors

Bldg 15, Graphics Research Analysis Facility (GRAF Lab)
X- 33667 (281/243-3667)
Cell: 267.250.3897
Apt: 713.432.7398
nina.h.patel@n .......
"To most people, the sky is the limit.. To those who love flight, the sky is
home".

Nina H. Patel
Penn State University CO-OP
NASA Johnson Space Center
Space and Life Sciences, Human Factors

Bldg 15, Graphics Research Analysis Facility (GRAF Lab)
X- 33667 (281/243-3667)
Cell: 267.250.3897
Apt: 713.432.7398
nina.h.patel@n .......
"To most people, the sky is the limit.. To those who love flight, the sky is
home".

--0-1881104778-1118492058=:20873
Content-Type: text/plain; charset=iso-8859-1
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I'm a newbie with ARToolkit.
 
There is something I wish to know about the toolkit.Correct me if I'm wrong--(1)first I need to calibrate the camera to get the perspective projection matrix (2)then I need to do something to get the transformation matrix from marker coordinate system to camera coordinate system.
 
I'm not sure about how to get Tcm so can anyone direct me to any link which can explain the theory behind the thing.
 
Thank you.

		
---------------------------------
Discover Yahoo!
 Have fun online with music videos, cool games, IM & more. Check it out!
--0-1881104778-1118492058=:20873
Content-Type: text/html; charset=iso-8859-1
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<DIV>I'm a newbie with ARToolkit.</DIV>
<DIV>&nbsp;</DIV>
<DIV>There is something I wish to know about the toolkit.Correct me if I'm wrong--(1)first&nbsp;I need to calibrate the camera to get the perspective projection matrix&nbsp;(2)then I need to do something to get the transformation matrix from marker coordinate system to camera coordinate system.</DIV>
<DIV>&nbsp;</DIV>
<DIV>I'm not sure about how to get Tcm so can anyone direct me to any link which can explain the theory behind the thing.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Thank you.</DIV><p>
		<hr size=1>Discover Yahoo!<br> 
Have fun online with music videos, cool games, IM & more. <a href="http://us.rd.yahoo.com/evt=32660/*http://discover.yahoo.com/online.html">Check it out!</a>
--0-1881104778-1118492058=:20873--

Lim,

You are correct on both of them.

For your first point, I think in general the default perspective
projection matrix file that came with ARToolkit is sufficient with
many basic AR things you want to do.
If you read the docs/mailing list, you'll find that the default camera
parameter it's sufficient for putting virtual objects on top of the
marker. However, if you need precise accuracy (such as for visual
registration), I believe you need to do the camera calibration to get
your actual camera's parameter.

For your second point, you are also correct. Using ARToolkit, you can
get Tcm, which is the  transformation matrix from marker to camera.
I am expecting you already know how to get Tcm by coding, right?

The theory to get Tcm is best explained in this paper
Kato, H., Billinghurst, M., "Marker Tracking and HMD Calibration For a
Video Based Augmented Reality Conferencing System"

You can find that paper by asking Mr. Google.

Ronald



On 6/11/05, lim kianhong <spartan_kings@y ........> wrote:
> I'm a newbie with ARToolkit.=20
>  =20
> There is something I wish to know about the toolkit.Correct me if I'm
> wrong--(1)first I need to calibrate the camera to get the perspective
> projection matrix (2)then I need to do something to get the transformatio=
n
> matrix from marker coordinate system to camera coordinate system.=20
>  =20
> I'm not sure about how to get Tcm so can anyone direct me to any link whi=
ch
> can explain the theory behind the thing.=20
>  =20
> Thank you.
>=20
>  ________________________________
> Discover Yahoo!
>  Have fun online with music videos, cool games, IM & more. Check it out!=
=20
>=20
>

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please exclude me from the mailing list! thanks

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<DIV>please exclude me from the mailing list! thanks</DIV><p>__________________________________________________<br>Do You Yahoo!?<br>Tired of spam?  Yahoo! Mail has the best spam protection around <br>http://mail.yahoo.com 
--0-1448051159-1127655452=:6379--

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Err.. forget my previous post.  I found the reason...

=P

Mingwei

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Err.. forget my previous post.&nbsp; I found the reason...<br><br>=P<br><br>Mingwei<br>

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