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Yasin Akgn
10-22-2001, 07:05 PM
Dear BIOMECH-L readers,
recently I requested help in finding a "video based motion analysis and
editing system". Here's the original message:
*************


I am a student studying mechanical engineering and currently researching
comfortbility of automobile seats. I am looking for video based motion
analysis systems, with video editing capabilities.
Its planned to record drivers in car seat movement with video cameras for
several hours. At the same time, I would like to record a seat interface
pressure, with a sensing mat (TEKSCAN).
Do You know of a software package, which automaticly recognizes those
sequences, which indicate a movement of the subject?
I would also like to record driving data, such as stiring, braking,
accelerating, indicating, ...etc. in order to find out, which of the
indicated movements are related to driving.
Could You give me any suggestions, how to synchronize the video signals, the
seat pressure data and the driving data?
MY AIM IS TO FILTER OUT ALL THE SEQUENCES WITH NO MOVEMENT AND MOVEMENT
BECAUSE OF DRIVING.

So far, I had the following thoughts, how to tackle the problem :
- 2 3 mini-DVCAMS, to record the testperson
- 1 camera records a LED, which flashes, when the seat pressure mat
indicates a change of the pressure pattern
- mixing the video signals in a mixer (SONY), to compile the camera views to
an image, consisting of four splitted images (_)
- Storing this image in MPEG-format on the harddrive of a notebook or
alternatively on digital video tape
- analysing the video with "NOLDUS Observer":
- viewing the video with fastforwarding, flashing LED indicates the duration
of a movement
- producing of a highlight video, including these marked scenes, where a
movement is recognized
- manually cutting of the scenes, where driving related movements are
indicated

Do You have a less tedious way of filtering between
a) in general movement and no movement
b) driving related movement and non-driving related movement

I would be very grateful of any suggestions or comments regarding above.I am
open for a totally different solution or a different approach, how to
realize the selection of movement data.

Thank You very much for your time and consideration in advance

Yasin

Thanks very much to all those who replied. A summary of main replies
follows.


SUMMARY: "Motion analysis and editing system"

Answer Nr. 1 :dieter rosenbaum...

I know that novel gmbh (germany) or novel electronics inc (usa) support this
approach with the novel player software that allows you to synchronize video
and pressure distribution measurements (in this case you would have to use
the pliance seat mat). we used it successfully for synchronizing children's
walking patterns with plantar pressure measurements.



Nr.2 : Jim Walton INTERNET: Jim@4DVideo.com

We would be happy to develop a custom system to meet your
specific requirements, but I'm not sure it could be done
within the limits of your budget. We are already developing
similar systems for the US Government.

Just let me know if you're interested in having a custom
system built for your facility.


Nr.3

Thank you for your interest in the Ariel Performance Analysis System (APAS).
The APAS is a 3D video-based movement analysis system which accurately
quantifies function and provides objective data the professional may use to
justify or evaluate treatment. Areas of successful application for the APAS
include human performance, injury and rehabilitation assessment,
quantification of loss for compensation claims, equipment and product
testing and development, determination of potential or actual risks for
products and activities in liability litigation, as well as applied research
in the areas of orthopedic medicine, therapeutics, and physical training.

The APAS integrates state-of-the-art computer and video processing hardware
with specialized software modules that perform data collection, analysis,
and presentation. Objective quantifiable documentation is provided for both
2-Dimensional and 3-Dimensional analysis. Specific points of interest can
be digitized with user intervention or automatically using contrasting
markers. Stick figures are then generated and can be synchronized with
kinematics data. Additionally, up to 32 channels of analog data (i.e. force
platform, EMG, goniometers etc.) can be synchronized with the kinematics
data.

The APAS product information can be found on the Ariel internet site
(www.arielweb.com). The direct address to several areas that might be of
interest are listed below.

APAS Product Information
www.arielnet.com/Main/adw-04.html

You can even download a full version of the APAS for a free 30 day trial.
Please review the information and feel free to contact us for any additional
questions.


Nr. 4 : hen@ami.dk


even though your questions are pointing in an other direction, you might get
some inspiration from this internetsite www.anybody.auc.dk
The group are woorking with Human Modeling systems and are wooking together
with Ford Motor Company in designing carseat and posture comfort.


Nr.5: A J Frank, Vista Medical, www.vistamedical.org

If you have not already purchased or have a Tekscan we can help you. The FSA
pressure mapping system can be jointly triggered and synchronized with other
data gathering tools with a TTL line. We have done this with several
researchers.

You may also want to check with Diane Fennety of Dal Housie University. She
has done initial work quantifying movement and comfort in office chairs
using a piece of software we made available the tracks center of pressure
movement.

She is at:


Anne Fenety 902-494-2634 Pers.
Dal Housie University 902-494-1941 Fax
School of Physical Therapy
5869 University Ave.
Forrest building
Halifax, NS B3H 3J5

At most of the the major seat manufactures are using the FSA in their R&D
labs to develop the next generation of automobile seating. A study
comparing the available Pressure mapping tools is available if interested.

Nr.6 seeholzer@simi.com ; Web: http://www.simi.com

I read your posting to BIOMCH-L and would like to comment on it.
SIMI-Motion is a optical motion analysis system and we recommend DV video or
high speed cameras for capturing the movement sequences.
The system is able to capture up to 4 cameras SYNCHRONIZED (accuracy approx.
1 ms). You can use normal DV cameras from SONY or JVC etc.
It is also able to acquire analog data (synchronized, too) and it supports
TekScan fsx-files.

SIMI has another product ("SIMI-Scout") which is used to analyse team
tactics in sports. It is able to select and play small parts from the
complete video. Of course you can observe anything with it, not only
football or basketball teams. You are completely free to define your
attributes and filters.

For further information please visit www.simi.com and feel free to ask more
questions.

Thomas Seeholzer


Nr.7 : Mark D. Halliday, www.peakperform.com

Are you familiar with Peak Motus? Peak offers a variety of biomechanical
assessment tools that can be integrated into a complete system to solve all
of your motion measurement needs. Clinicians, researchers and educators in
many of the world's major medical, research, corporate and teaching
institutes use our systems.

Peak Motus is built on a modular platform that can easily be integrated with
a variety of analog devices and synchronized with 2D or 3D kinematic data
derived from video. If you would like more information, please let me know.
I'd be happy to send you a complete packet of literature detailing features
of Peak Motus. I look forward to hearing from you soon.


Nr.8 : Wagner de Godoy , wagner.godoy@bol.com.br
Gait Laboratory


Perhaps you can use this software to aid in your research:
KAVIDEO
http://www.kavideo.sfsu.edu/


Nr. 9 : Antony Hodgson, UBC Mechanical Engineering

If you have access to an optoelectronic (Polaris, Flashpoint) or ultrasonic
(?) or magnetic (Polhemus, Flock of Birds) measurement system, I would use
that instead, as they will give you directly the 3D coordinates of a body
segment. You'd still have to figure out what is driving related, but your
data set would be much more manageable.


Nr. 10 : David Howard, EMail: david.howard@vicon.com
Sales and Marketing Manager
Web: http://www.vicon.com
Vicon motion systems , supplies 3 D optical motion capture systems.

We have supplied systems to a number of major vehicle manufactures who use
our system for ingress, egress, and in cabin experiments. We have purpose
built small compact cameras suitable to mount within the confined
environment of the cabin.
Our software automatically reconstructs the 2 D images from multiple cameras
into a single 3 D image, and together with a suitable model allows the data
to be analysed showing average motion, angles and distance calculations
automatically.

If you are interested in further information please let me know and I can
forward further details.


Nr. 11 : Thor Besier PhD , http://www.siliconcoach.com

you might like to try our siliconCOACH software for easy capture of
video....it will automatically name your movies and you just play through
the video, pressing start and stop when you have the movements of interest.
do the same with all 3 videos and then you can create split screen
synchronised views of the movements.

Our standard software package is siliconCOACH Sports and costs $450 USD.
The Pro system is $900 USD but will show individual fields from captured
video (60 Hz).



Nr. 12 : John Corcoran , Sales Manager AMLAB Technologies
Web www.amlabtech.com.au





Have you though about using a time code generator to stamp a time on the
video tapes. Yu could then use some form of data acquisition system to
monitor the movements and then go directly to the times you require on the
video.

Nr. 13 : Atul
Pl. see
www.qualisys.com
for reflective marker based motion analysis systems.
I am sure this will help you.
Pl. email to Ms. Annika Lundqvist for further assistance through webpage..

-------------

I thank you all very much for Your help!
Yasin






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