I2M Motion Tracking Product Line

Our I2M (IMUs to Motion) family of products provides a combination of leading edge IMU (inertial sensors) technology with a powerfully but easy to use motion analysis software solution HM-Analyzer (HM = Human Motion).

The IMUs each contain 8GB of storage allowing them to be used offline or real-time with the data being backed up while transmitting also to a PC. All sensors are synchronized when in wireless mode. Each IMU contains an accelerometer selectable to 16g. (A version for synchronized logging only is also available on request.)

Our solutions include a variety of kits of 6, 10 or 15 sensor configurations and application software. We can also provide kits with any number of sensors. Our kits and options include docking stations to charge the IMUs and download data as well as the hardware to control the wireless transmission of the sensors.

A variety of mounting accessories are available and several are included in the kit configurations.

Applications

Human motion applications include biomechanics research. gait analysis, ergonomics. neurology, sports, and more.

Other applications include vibration analysis, inertial guidance, virtual reality, robotics, gaming industry, training, and more.

HM-Analyzer (Human Motion Analyzer)

Our HM-Analyzer maps from one to 15 inertial sensors to various segments of the body (such as trunk, pelvis, arms, etc.) in order to obtain joint angles according to ISB - International Society of Biomechanics (ISB angles are also anatomical angles) or according to AAOS. The software and system are totally scalable allowing you to use any number of sensors as required. The skeleton which is used for visualization can be adjusted according to the subject's anthropometry.

The software takes care of joint definitions and conversions. The user simply needs to identify the segment that is mapped to the specified sensor.

The application synchronizes the data automatically. The user can then perform various analyses within HM-Analyzer or export data. Processing and analysis of off-line or data stored on the built-in inertial sensor memory is also handled by HM-Analyzer.

The calibration procedure consists of the user selecting either the T-pose or I-pose (posture) and clicking "Calibrate" or using the auto-calibration option.

Animation allows you to replay a recording or an offline imported file. You can zoom in and out on the graphs using the mouse wheel.

Recording duration time can be set manually or automatically by specifying the start and end recording time.

HM-Analyzer includes synchronization capability (requires optional hardware Synch kit) with the Biometrics DataLOG (as slave or master) with EMG, force plates as well as other sensors and accessories. As well, there is an option to synch with a webcam.

DATS (Data Analysis Tool Set) Module

The DATS (Data Analysis Tool Set) module is included and performs a variety of joint angle analysis, filtering and data export. The DATS module provides a graphical user interface (GUI) to perform data analysis. The analysis can be done with streaming (real-time) data or with data that was previously recorded.

The interface uses a graph layout to create various analyses. Tools are available to easily connect the graphical blocks. Data processing block layouts can be saved for reuse.

The DATS module includes various filtering options, biomechanical tools to calculate joint angles (according to the ISB or AAOS) as well as various signal processing tools.

DATS also includes a variety of data filtering options that can be applied which include Butterworth, Chebyshev (1 & 2) and Bessel.

Graphical displays can include raw data such as acceleration or gyro data or computed joint angles according to the AAOS or ISB.

Saved analysis can be saved for reuse or future modifications.

Main Features

  • Capture motion orientation information from inertial sensors.
  • Easily map segments of a 3D model skeleton to inertial sensors and mappings can be saved to be reused in subsequent data acquisition to save time.
  • Dynamically display Euler or Quaternion orientation data as a scrolling, 2D graph.
  • Record multiple recordings each can be subsequently analyzed further and animated.
  • Display recorded data as a static, 2D graph.
  • The center of mass and center of gravity is displayed on the 3D skeleton.
  • Ability to customize 3D skeleton anthropometry
  • Apply filters (APDF, Bessel, Butterworth, Chebyshev I, Chebyshev II, Differentiation, Rectification, Acceleration and Velocity) to streaming (real time) data or recorded data.
  • DATS calculates anatomical angles of a selected limb and displays the data in real-time. ISB (International Society of Biomechanics) and AAOS conventions are supported.
  • Data can be synched with webcam.
  • When using DATS, data can be exported to HDF5 format, CSV & C3D.
  • A variety of calibration options (mag, gyro, T/I pose)
  • Several filtering options available which include Butterworth, Chebyshev and, rectification filters
  • Various data options such as Quaternion Splitter, Vector 4D Splitter, Quaternion Multiplexer, Euler to Quaternion Converter

Key Hardware Features

  • Synchronized IMUs: Data packets are exchanged to maintain precise time synchronization
  • Synchronization Resolution: 1ms resolution between inertial sensors
  • Transmission Range: 30m Line of Sight, 10m Indoors
  • Transmission Latency: 300ms (typical)
  • Data Buffer: 8GB storage completely eliminates data loss while streaming
  • Embedded IMU Buttons: When depressed can indicate an event to the software.

IMU Specifications

  Accelerometer 1 Accelerometer 2 Gyroscope Magnetometer Barometer
Axes 3 3 3 3 3
Range ± 16g ± 200g ± 2000 °/s ± 8 Gauss 300-1100 hPa
Noise Density 120 μg/√Hz 5 mg/√Hz 0.025 °/s/√Hz 2 mGauss/√Hz 1.3 Pa
Sample Rate < 3.2 kHz ≤ 2.0 kHz ≤ 10 kHz ≤ 75 kHz ≤ 182 kHz
Output Rate 20-200 Hz 20-200 Hz 20-200 Hz 20-200 Hz 20-200 Hz
Bandwidth 50 Hz 50 Hz 50 Hz 32.5 Hz 75 Hz
Resolution 17.5 bit 14 bit 16 bit 12 bit 20 bit

Device Characteristics

  • IMU Dimensions: 43.7x39.7x13.7mm
  • IMU Weight: 25g
  • Internal Storage: 8GB (~720 hours of recording)
  • Battery Life: 8h at 128Hz

Minimum System Requirements

  • Microsoft Windows 7, 8 & 10
  • Intel/AMD CPU, dual-core 2.0 GHz or more (i5 or equivalent recommended) for 6 IMUs or less. For 10+ IMUs running 64 or 128Hz, i5+ with 2.8 GHz quad core is the suggested minimum (or similar to i5-650 dual core hyperthreaded @ 3.2 GHz).
  • 6GB of RAM (8GB recommended)
  • 1GB of hard disk space
  • USB 2.0 ports (minimum 2, more depending on docking stations, IMUs)
  • 3D Hardware accelerated graphics card (AMD or nVidia recommended)
HM-Analyzer is a trademark of NexGen Ergonomics Inc.