Wayne Piekarski: Extra calibration hidden matrix issues

Hello Wayne/list,

Does anybody have an explanation of the gl_cpara that is calculated in
argConvGLcpara2() in gsub.c ?

Wayne, I saw that you were asking the same question in this posting bac=
k in
2001:
http://www.hitl.washington.edu/artoolkit/mail-archive/message-thread-00=
129--ARFORUM--Extra-calibrat.html

"
                                                                       =
                         =20
 This matrix performs                                                  =
                         =20
 the world to screen                                                   =
                         =20
 based projection, but                                                 =
                         =20
 also contains some                                                    =
                         =20
 extra obscure                                                         =
                         =20
 camera calibration                                                    =
                         =20
 values which distort                                                  =
                         =20
 the final object to fit                                               =
                         =20
 accurately                                                            =
                         =20
 against the target.                                                   =
                         =20
                                                                       =
                         =20

"

Have you figured out how argConvGLcpara2() defines the gl_cpara? -I wou=
ld
appreciate if you or anyone else could help me out on this one!

Thanks!

-----------------------------------------------------
Best regards,
Torbj=F8rn Engedal

ABB AS
Corporate Research Center
Bergerveien 12
N-1375 Billingstad
Norway
=

From:	torbjorn.engedal@n .........	Received:	Apr 20, 2004
To	artoolkit@h ..................
Subject:	Wayne Piekarski: Extra calibration hidden matrix issues
Hello Wayne/list, Does anybody have an explanation of the gl_cpara that is calculated in argConvGLcpara2() in gsub.c ? Wayne, I saw that you were asking the same question in this posting bac= k in 2001: http://www.hitl.washington.edu/artoolkit/mail-archive/message-thread-00= 129--ARFORUM--Extra-calibrat.html " = =20 This matrix performs = =20 the world to screen = =20 based projection, but = =20 also contains some = =20 extra obscure = =20 camera calibration = =20 values which distort = =20 the final object to fit = =20 accurately = =20 against the target. = =20 = =20 " Have you figured out how argConvGLcpara2() defines the gl_cpara? -I wou= ld appreciate if you or anyone else could help me out on this one! Thanks! ----------------------------------------------------- Best regards, Torbj=F8rn Engedal ABB AS Corporate Research Center Bergerveien 12 N-1375 Billingstad Norway =

From:	Wayne Piekarski <wayne@c ..............>	Received:	Apr 20, 2004
To	torbjorn.engedal@n .........
Subject:	Re: Wayne Piekarski: Extra calibration hidden matrix issues
Hi, Have a look at the following paper which was at the ART workshop ... Piekarski, W. and Thomas, B. H. Using ARToolKit for 3D Hand Position Tracking in Mobile Outdoor Environments. In 1st Int'l Augmented Reality Toolkit Workshop, Darmstadt, Germany, Sep 2002. http://www.tinmith.net/papers/piekarski-art-2002.pdf This paper discusses how to take the camera calibration matrices and modify them so you can use ARToolKit to extract out 6DOF transformations in an approximately orthogonal space. regards, Wayne --------------------------------------------------------------------------- Dr Wayne Piekarski - Researcher / Lecturer pho: +61-8-8302-5070 fax: +61-8-8302-3381 Assistant Director - Wearable Computer Lab mob: +61-407-395-889 School of Computer and Information Science ema: wayne@c .............. University of South Australia www: http://www.tinmith.net torbjorn.engedal@n ......... wrote: > Hello Wayne/list, > > Does anybody have an explanation of the gl_cpara that is calculated in > argConvGLcpara2() in gsub.c ? > > Wayne, I saw that you were asking the same question in this posting back in > 2001: > http://www.hitl.washington.edu/artoolkit/mail-archive/message-thread-00129--ARFORUM--Extra-calibrat.html > > " > > This matrix performs > the world to screen > based projection, but > also contains some > extra obscure > camera calibration > values which distort > the final object to fit > accurately > against the target. > > > " > > Have you figured out how argConvGLcpara2() defines the gl_cpara? -I would > appreciate if you or anyone else could help me out on this one! > > Thanks! > > ----------------------------------------------------- > Best regards, > Torbjørn Engedal > > ABB AS > Corporate Research Center > Bergerveien 12 > N-1375 Billingstad > Norway > > >