Lisa, I do agree with your "triggering" comments but not that motion capture is a subset of motion tracking (at least not in the way you described). I agree that the term "motion tracking" is a larger descriptor than "capture" in narrow field of animation, but not generically since to track you first must capture, then analyse. Video, magnetic, encoder, potentiometer, ultra-sonics are all capture technologies, and would turn your comment the other way around to say - "Video based motion tracking uses video motion capture technology, & magnetic motion tracking uses magnetic capture technology". However I would not say that motion tracking is a subset of motion capture. I would also like to address the intention of the manufacturers of these systems. I have read a number of mails on this news listing equate "motion capture" with the 3D animation industry even when Oxford Metric's "Vicon" and Motion Analysis' "Falcon" systems originated and still have MUCH larger market strongholds in medical research and biomechanics. At Jim Henson's Creature Shop - UK I was fortunate enough to be the one of the first in the world to use and develop Vicon systems for the 3D Animation industry in 1993, a time when we used only 5 cameras and pretty lengthily video->data reconstruction software. We collaborated with Oxford Metrics on Beta testing and some design features to improve the pipe-line for the animation industry since the only other systems being used were in medicine and research outfits that had different working practices and requirements. I suppose Animation is the publicised end of the spectrum but by no means the norm or largest user-base. Generally I would not use the term tracking since that almost implies that the end result is a direct consequence of the movement of the subject - which it is not necessarily true. Regards, Richard Widgery richardw@kinetic-impulse.com KINETIC IMPULSE - Digital Performance Art & Science -------------------------------------------------------- http://www.kinetic-impulse.com 87 Hadlow Road, Tonbridge, Kent, TN9 1QD, England Tel: +44 (0) 7050 644818 Fax: +44 (0) 1732 364067 -------------------------------------------------------- -----Original Message----- From: owner-dance-tech@lists.acs.ohio-state.edu [mailto:owner-dance-tech@lists.acs.ohio-state.edu]On Behalf Of Lisa Naugle Sent: 06 January 2002 04:42 To: dance-tech@lists.acs.ohio-state.edu Subject: Motion capture as subset of Motion Tracking >How about calling the motion capture for animation "motion capture" and >referring to the second form as "motion trigger." The second form of >technology is more about triggering a pre-scripted event, whether that be a >sound, light, or video projection, while the first is about "capturing" or >documenting precise movements made by the entire body through time. The term "Motion Tracking" is often used to describe video based motion "sensing" and in an environment where there is mutual influence (interactivity) between movement and other media. The object (presence of the dancer) is "tracked" in space and time and influences the events. The word "triggering" implies a control paradigm which is more limiting and in my experience, less useful than a paradigm of tracking or mutual influence. Trigger means "this" causes "that" and is a one-to-one mapping between a movement and an event. Triggering implies a single thing is happening...turing on and off...a binary condition. Whereas mutual influence implies more room for nuance and other forms of interactivty rather than straight forward trigggering. Motion tracking can be used for interactivity, that is tracking the attributes of the motion in the video. Motion capture is a sub-set of motion tracking, that is, tracking markers of a moving object or person. It is a very specific method. Motion capture is a form of motion tracking that is speciialized for the needs of 3D animation. Video based motion capture uses video motion tracking technology to make itslef happen. Magnetic motion capture uses magnetic motion tracking technology. Best, Lisa ===================================== Dr. Lisa Naugle Assistant Professor Dance and Technology University of California, Irvine School of the Arts, Department of Dance MAB 300 Irvine, California 92697-2775 email: lnaugle@uci.edu tel: (949) 824-3209 fax: (949) 824-4563 http://www.arts.uci.edu/lnaugle/
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