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NB Following notes are totally GUI-based at present. Rewrite to be task-based. Should cover anything useful for users that we haven't had room to document in either the app itself or in the Quick Start guide.

From KD: 'Visual application for capturing raw inertial and analytic data, which is not limited by laboratory settings'

Do we want compatibility/setup info, or is this all taken care of elsewhere (spec sheets/in app)?

Add link to relevant videos on YouTube:

  • Introduction to IMU Blue Trident (Unboxing)
  • Introduction to the Vicon Capture.U app

Capture.U app

Supports only Blue Trident, not Blue Thunder (do we need this as a note somewhere?)

Mention (re Blue Trident): IP68 rated (up to 3 m for 1 hour), Bluetooth 5.0 (4.2 currently)

Minimum compatible iOS version:

  • iOS 10 and BLE 4.2 devices: Bluetooth 4.2 comes with iPad Air 2, iPad 2017, iPad 2018, iPad Mini 4 and early iPad Pros iPhone. iPhone 6/iPhone 7

Supported iOS 12 devices and BLE 5:

  • IMU prefers Bluetooth 5, which is the iPad Air 2019, iPad mini 2019, iPad Pro 12.9, iPad Pro 11 inch (some imminent - check) iPhone 8, iPhone X and above

Capture modes

To sensor: if you want unlimited range and up to 16 sensors (tbc). The other modes capture to device, so are constrained by Bluetooth range of device.

For both sensor and device, up to 1600 Hz for the high (200) G sensor, 1125 Hz for the lower (16) G sensor.

The capture modes are explained in more detail in the following sections:

Capture to sensor (Trident)

Choose this mode when you want a high sensor count and unlimited range, eg track performance (ie capture data from) of multiple athletes running a marathon, etc.

  • 16+ sensors (tbc)
  • IMU data
  • 12-axis
  • Desktop output
  • Unlimited range

Capture to device

Choose this mode when you need a higher sensor count than Real-Time Insight. You can use the same capture rate as To sensor, but within the Bluetooth range of the device. You can use video reference.

(iOS only: iPhone, iPad) Tablet only at launch, phone to follow.

  • Up to 6 sensors (tbc)
  • IMU data
  • Video reference
  • 12-axis
  • CSV (and PDF?) output
  • Bluetooth - 20m+

Real-Time Insight

Choose this mode when you want to use real-time video and real-time overlay, but without being constrained by the pre-configured(check?) settings of the Activity Widgets. You can define your own indicator levels (ie, set a threshold for alerts). For example, you can choose to be notified by a sound when a specified level is breached, so that you can easily identify when an athlete hits a ball hard enough, etc. Example use: coach and athlete want to review performance data over multiple trials together on iPad, then coach sends athlete a report of what was reviewed.

  • 2 sensors
  • IMU data RT
  • Video data real-time overlay - lets you watch graphical data as a subject moves. You can then save a video to your device (iPad, etc) and/or export the data as CSV, or generate a report as a PDF - applies to all modes?
  • 3 acceleration or gyroscope
  • Multi-output
  • Bluetooth - 20m+

Activity Widget

This mode is great for undergraduate research projects, grass-roots sports, etc, eg to look at fitness, etc - where a quick assessment with minimal/no user setup is required. You use pre-defined workflows that have output metrics. You can export reports or actual (CSV?) data.

(In example of using this widget for real-time coaching, we say ( it's great for immediately reviewing video (eg coach with athlete) as soon as activity is finished and giving feedback on possible improvements. 'Not concerned with keeping, exporting, collating data'. Confirm we can export reports/data once finalised widgets available.)

More complex example of use of multiple Vicon products: sports researcher/undergrad uses widget to collect trials easily, then performs further data analysis using Capture.U Desktop?

Do these screens exist?:

Dummy screens - showcasing walkthrough of collecting data using the activity widgets (example is of jumping, but could be any of the activity widgets).

Five key screens (= five key activities to document?):

  1. Select widget - set-up: subject, sensor and example of requirement movement (examples and sensor placement use gifs).
  2. Capture - ability to add video on with IMU overlay
  3. Review - replay video - chose to save if required. Display key stats, e.g. how high jump was
  4. Next trial - repeat capture
  5. Results - review all trials and ability to export as PDF

Real-time streaming: Sprinting, jumping, swimming, etc. (What are Power Meter and Counter Rotation for?) Final list to be confirmed.

  • 1-2 sensors
  • IMU data RT
  • Video real-time overlay
  • 3 acceleration or gyroscope
  • Workflows
  • Calculations
  • Multi-output
  • Bluetooth - 20 m+


Place one sensor only near sacrum.

Outputs/Data collected:

  • Instantaneous velocity over a 40 m sprint (m/s)
  • Time to peak velocity (s)


Place one sensor only near sacrum.

Outputs/Data collected:

  • Velocity of jump (m/s)
  • Acceleration (m/s/s)
  • Height of each jump (lengths for broad jump) (m)
  • Max velocity of each jump (m/s)
  • Duration: length of time from start to end, in seconds
  • Indexes: start, dip, peak, dip, end of jumps
  • Eccentric contraction times in seconds
  • Concentric contraction times in seconds


Place one sensor in the togs, just above the sacrum.

Outputs/Data collected:

  • Instantaneous velocity curve of a freestyle swimmer over a 100m swing (4 x 25m lengths)

Counter Rotation

Place two sensors, one near C7 and one on sacrum.

Outputs/Data collected:

  • Counter rotation angles of an athlete (angle difference between C7 and sacrum sensors in 3 axes)
  • Global angles of the C7 sensor

Power Meter

Place a single sensor on weight bars.

Outputs/Data collected:

  • Velocity curve vs. time
  • Power curve vs. time
  • Force curve vs. time
  • Max velocity
  • Max (concentric) power
  • Max force

Capture.U desktop

Replaces IMeasureU Lightning. Cleaner workflow.

Add link to Introduction to Capture.U Desktop video on YouTube.

Collecting data when:

  • I want to collect a movement or task which isn’t defined by a widget.
  • I want to collect data more general data from a subject that cannot be defined by as a specific activity.
  • I need to be able to start and stop a Free collection.
  • I want to be able to collect video as well
  • This collection has no associated Analytics
  • The ability to export the Raw 9 axis or Global Angle data is key
  • Capture.U Desktop / data offload requirement

Capture.U desktop Windows


  • Recommended and fully supported - Windows 10 (64 bit) -- with .NET Framework 4.5 and above.

Capture.U desktop iOS


  • MacOS Sierra (10.12)

Troubleshooting/Known issues

(title TBD - this is just a placeholder so we document these issues somewhere - better explanations needed)

  • iPhones for Capture.U display in portrait mode only and are locked into the display view. (see CAP-47)
  • To close the Benchmark keyboard, tap the Real-Time Insight graph.(see CAP-52)
  • When a device is held in portrait orientation, graphs are exported in portrait orientation (side-by-side).
    When a device is held in landscape orientation, the graphs are exported in landscape orientation (one below the other).
    As phones are locked to portrait orientation, graphs are always exported in portrait orientation (side-by-side). (Is this Real-Time Insight only, or just whenever graphs are exported?)
    (see CAP-57).