home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!utcsri!torn!utzoo!dciem!sjm
- From: sjm@dciem.dciem.dnd.ca (Stewart Moorehead)
- Newsgroups: sci.engr.control
- Subject: Solution of matrix Equation AX=XB
- Message-ID: <6611@dciem.dciem.dnd.ca>
- Date: 12 Nov 92 14:38:27 GMT
- Distribution: na
- Organization: Defence and Civil Institute of Environmental Medicine
- Lines: 19
-
-
- I am recording the 6D position (x,y,z,roll,pitch,yaw) of an object
- using two independant devices. Since these devices have different
- reference frames a transformation matrix, call it X, must be
- calculated. To calculate X, the equation AX=XB must be solved, with A
- and B being known 4x4 matrices. I have found two methods which claim to
- solve for X. They were proposed by Roger Tsai and Reimar Lenz (June
- 1989 IEEE Transactions on Robotics and Automation) and by C. C. Wang
- (April 1992). Both of these methods work if I pre-define X and create
- some 'cooked' data around it, however when I use actual data that was
- recorded using teh devices I get an incorrect answer. The devices being
- used are any two of : Northern Digital's Optotrak, Logitech's 3D mouse,
- and Polhemus Fastrak. I feel that the inherent error in these devices
- may be too great for the methods being used.
- I would appreciate it if anyone has information regarding these methods
- or the devices being used. If anyone has solved a similar problem
- please respond.
- You can send mail to sjm.dretor.dciem.dnd.ca
-
-