MOTION CAPTURE

EQUIPMENT

Electro Magnetic Tracking System

Advantages

High Accuracy Visual occlusion will not affect the tracker or the transmitter. Sensor size suitable for the proposed project.

Disadvantages

Limited Range Electromagnetic Interference possible due to the monitor, computer system, power lines,

mobiles etc.

Large metallic objects, such as desks or cabinets, located near the source or sensor, may adversely affect the performance of the system

Optical Tracking System

Advantages

Higher Rate of data acquisition when compared to EMTS No problem of electromagnetic interference Higher Range than EMTS

Disadvantages

Visual occlusion a major problem. Sensor size may not be suitable for the proposed project.

POLHEMUS LIBERTY

FEATURES

Electromagnetic Tracking Based System

Wired System

Update Rate: 240 Hertz per sensor, simultaneous samples

Latency: 3.5 ms

Supports up to 16 sensors depending on the model

Accuracy: 0.762 mm RMS for XYZ positions and 0.15 RMS for sensor orientation (smaller sensors

might reduce the specified range slightly)

Software Development Kit included with the Software package

Dimensions of the Unit: 31cm x 17.8 cm x 27.94 cm, Weight- 5 Kg

Compatible with the 1.8 mm micro sensor also manufactured by Polhemus

Compatible with Bio-Mechanical analysis softwares Visual 3D and Motion Monitor

Has distortion sensing capabilities which can warn if the environment is not suitable for data

acquisition.

Compatible with Matlab and LabVIEW. ( Drivers Available)

1.8 mm Micro-sensor

(Polhemus)

Update rate: 240 Hz Weight of Sensor Head: < 1 gram 6 Degrees of Freedom Tracked: X,Y,Z positions; Pitch, Roll and Yaw No Line of Sight required

Ascension trakSTAR

Electromagnetic Tracking Based System Wired System Update Rate: 80 Hz default, user-configurable from 20-255 Hz Latency: (The specification is not present on the website and the manufacturer didnt clarify it

either!)

Supports simultaneous tracking of up to 16 sensors (But only 4 sensors per unit) Accuracy: 1.4 mm RMS, 0.5RMS Dimensions of the Unit: 29 cm x 18.4 cm x 6.4 cm Weight: 1.31 kg per unit Compatible with Micro Sensors Manufactured by the same company Compatible with Motion Monitor and Ascension trakStar Range: Mid Range Transmitter (660 mm - Normal Mode,1800 mm - Expanded Volume Mode) Dimensions of Transmitter: 96 mm x 96 mm x 96 mm, Weight: 2.3 Kg Compatible with Matlab and LabVIEW. ( Drivers Available)

Ascension Micro Sensors

Biomechanical Analysis Softwares

Visual 3D

Motion Monitor

Visual 3D Biomechanics Calculations: 3D Kinematics, 3D Kinetics, & EMG. In addition to metrics such as joint

angles, moments, center of pressure, signal filtering, DFT, center of mass, energies, rotations,

volumes, derivatives, and much more you can write your own computations. Full control of input parameters, Euler angles, rotation order for cardan angles, coordinate systems, and other

parameters make Visual3D the most powerful analysis tool for biomechanics available.

Comprehensive Reporting and Graphing. Graphs can be constrained to events, exported as images or OpenDoc XML, or correlated to create normative data.

Enables and Supports Complex Analyses. Build custom mathematical expressions within a pipeline for creating metrics, processing signals, or manipulating data

Real-Time Streaming from systems that can support it.

Real-Time Biofeedback, RT Analysis, RT Pipeline

Induced Acceleration Analysis.

Visual3Ds standard input file is in the C3D format. Visual3D reads and writes C3D files created on any common computer platform (PC, VAX, SGI, MAC). Tab-delimited ASCII files and Matlabs files can be imported, exported and converted into C3D files.

SDK available for development of plugins

The data from Visual 3D can be saved in a database but programming expertise required to

use that data elsewhere.

Produces .mot and .xml files.

A Visual 3D server required for biofeedback and real time streaming and analysis. (an

additional $3000!).

The Server is not able to have Visual3D v5 as a client as that program has it's own dedicated

real-time component.( No information available about the real time component)

The full RT Server is needed if you want to write your own biofeedback applications outside

of Visual3D - using Matlab, C++, python, etc to make the client apps. Even then, you use

Visual3D to define the model and analysis pipelines. These are incorporated into the client,

which in turn uploads them to the biofeedback Server so that it knows what to provide back

to the client.

Data can be exported to Matlab.

Motion Monitor Compatible with a very wide range of motion capture equipment including Polhemus and

Ascension.

The MotionMonitor is a turn-key 3-D motion capture system designed to synchronously collect data from kinematic trackers, EMG, force plates, video, event markers and other analog devices.

Event driven triggers for exact start or end of data collection Autosave/Autoname features for hands-free data collection Event onset and duration tracked using a choice of hardware switches such as IR, LEDs and FSRs User defined software switches for contingent start or end conditions Automatic synchronization of data collected from devices with different sampling rates Input is the C3D format. Determine joint centers and segment orientation using accepted protocols such as the Bell, Davis or

Functional methods for hip and shoulder joint centers.

All kinematic and kinetic data are user-selectable from drop-down menus with no programming required.

New variables can be defined using standard mathematical notation including vector and matrix operations.

Employ analog filters such as Butterworth and Chebyshev with cut-off frequencies for each sensor and each analog channel.

Apply user-defined, Dempster or Zatsiorsky anthropometric assumptions. Scripting functions to facilitate complex data collection. Post sales support seems to be better than Visual 3D.

The company seems to provide support in purchase of all the equipment.

The Bio-feedback system seems suitable to the project.

The Company will help with integrating the system with the hardware.

Bio-Feedback module present and visual perturbation possible using this module which fulfills a

requirement of the project.

Phase-Space Active LED Marker

System

Frame Rate: 960 fps at full Resolution

Lightweight linear detector based cameras (3600 x 3600 resolution at 960 Hz)

Subpixel Resolution: 30000 x 30000

Latency=