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Vicon Capture.U Desktop lets you download data that you collected with Vicon Blue Trident IMU sensors and access a walk-through and documentation.

From Capture.U Desktop, you can export data as CSV (both raw data export and Aligned CSV, for synchronized sensor data, enabling you to directly compare IMU axes), or X1D (for import to Nexus) for further analysis.

Watch the Vicon video, Using Capture.U Desktop on YouTube.

When using Capture.U Desktop, note that:

  • Capture.U Desktop is a fixed size window so can't be minimized or maximized.
  • To close Capture.U Desktop, click the Exit button (bottom left of the window).
  • Capture.U Desktop 1.1.1 is supported by Firmware 9.x, and the Capture.U 1.2 app and Nexus 2.10 are supported by Firmware 9.0.4 and later.

For more information about Capture.U Desktop, see:

What's new in Capture.U Desktop 1.2?

The latest version of Capture.U Desktop provides these new features:

For information on previous versions of Capture.U Desktop, see the PDFs Vicon Capture.U 1.1 User Guide and Vicon Capture.U 1.0 User Guide .

One-click download

When capturing in To Sensor mode, you can now download your data with a single click to a location and format you have previously chosen.

  1. Specify the required download settings on the new Settings tab, including the Save To location and the file format options for data export.



  2. Click Process, and on the Captures tab, select the one-click Download option for each required To Sensor session.



    When using one-click download, you can't trim the data. If you need to trim the data, use the Edit & download option instead.
    When you select Edit & download, information from the Settings is populated into the Preview tab.

For more information, see Download with a single click.

Export onboard global angles

Capture.U Desktop now enables you to export global angles that you captured in To Sensor mode with the Capture.U app. Global angles are automatically included in the normal data export process (see Download a trial from the sensors).

When exporting global angles, bear in mind these points:

  • You can download global angles using either of the options on the Process tab: Edit & download or one-click Download. For details, see Download a trial from the sensors.
  • No preview data of trials containing global angles is available, even if you use the Edit & download option

You can export global angles data in all the usual data export formats:

  • CSV (raw data) The global angles are available in the exported _lowg.csv files. They are exported as helical angles (x_deg, y_deg, z_deg) and in a quaternion matrix (qx, qy, qz, qr).
  • Aligned Outputs (at either a specified output rate or the default rate):
    • CSV (aligned) The global angles are exported as helical angles, which are represented as x_deg, y_deg, z_deg, and in a quaternion matrix, represented as qx, qy, qz, qr.
    • X1D (for import into Nexus) When imported into Nexus, global angles can be visualized in the Graph pane and in the 3D Perspective view.

Export aligned data at a specified rate

You can now choose the rate at which your aligned CSV data is exported. For example, if you specify 1000 Hz, all data exported is aligned to 1000 Hz.

You can do this in either of these ways:

or

The Output Rate applies to both aligned CSV and X1D files to align all data to this rate.

If you don't set the Output Rate, the data is aligned to the highest capture rate (ie, high-G acceleration), so all data aligns to 1600 Hz.

Set the default output rate for subsequent downloads

  1. On the Settings tab, select the required export options (for example, the location, raw data (CSV), and aligned data (X1D and CSV)).
  2. Select Output Rate and in the text box, enter a value between 25 and 3200 Hz.



    The specified output rate is applied to all trials subsequently downloaded, unless you change the settings, either on the Settings tab again or via Edit & download (see Set the output rate for a single download).

Set the output rate for a single download

  1. On the Process tab, select the Edit & download option for the required trial.
    The Preview tab is displayed, showing the currently specified options for Aligned Outputs:
    • If you haven't set the default output rate (see Set the default output rate for subsequent downloads), the Aligned Output options are not selected and the Output Rate is blank.
    • If you have set the default output rate, the values you selected populate the Aligned Outputs options and you can choose to either leave them as they are or change them.
  2. Set the required export options (for example, specify the required Save to location, raw data (CSV), and aligned data (X1D and CSV)).
  3. Select Output Rate and in the text box, enter a value between 25 and 3200 Hz.



  4. Click Download to apply the specified output rate to the selected trial.

Graph legend automatically displayed

Capture.U now automatically displays a graph legend at the top right of the Preview tab, to enable you to easily identify which curve is related to each sensor.

The legend displays an entry for each of the sensors associated with the trial and indicates which color on the graph belongs to which sensor.

An asterisk (*) is displayed when no preview is available for the sensor(s). This may be because global angles were captured or because data has been deleted from that particular sensor, for example.

Erase data for all connected sensors

You can now erase sensor data for all connected sensors, instead of having to select each sensor individually.

To erase data for all connected sensors:

  • On the Sensors tab, click Erase all sensors.



    If the firmware for any of the selected sensors needs updating, you are alerted that the data cannot be not erased from those sensors until the firmware is updated.

Export notes from To Sensor mode

In Capture.U Desktop, you can now review, edit and export as a .txt file any notes that you made during or after capturing data in the To Sensor mode of the Capture.U app.

Notes that are written to the sensor populate the Notes field on the Preview tab. Any notes that you add post-capture in the Capture.U app are synced to the sensor, as long as the sensor is within range. You can also export these post-capture notes from Capture.U Desktop.

Note that:

  • Changes made to the notes in Capture.U Desktop are not synced to the sensor, so they are not retained after you exit the Capture.U app.
  • You can continue to export notes directly from the Capture.U app, as previously.

To export notes from the Capture.U app:

  1. In the Capture.U app, create your note(s) during or after capture (remember that you can only add notes after capture if the sensors are still within Bluetooth range).

     

  2. In Capture.U Desktop, on the Captures tab, to the right of the trial that you want to download:
    • To download your notes without making any further changes, click Download.
      or
    • To edit the notes or make other changes to the data, click Edit & download.



      On the Preview tab, the notes you made in the Capture.U app are displayed in the Notes field.



  3. Make any required changes, such as cropping the trial and editing the notes.



  4. When you click Download, a .txt file containing the notes is exported to the Save to location.

Requirements for Capture.U Desktop

The following requirements are the minimum that are recommended and fully supported:

Capture.U Desktop for Windows

  • Windows 10 (64 bit)

Capture.U Desktop for OSX

  • macOS Sierra (10.12)

Download and install Capture.U Desktop

To install Capture.U Desktop on your computer:

  1. Check that your computer software meets the recommended specification (see Requirements for Capture.U Desktop).
  2. Download Capture.U Desktop from:
    https://www.vicon.com/software/capture-u/
  3. Unzip and double-click the .exe file to install.

Connect sensors to Capture.U Desktop

To connect sensors:

  1. Insert each Blue Trident sensor into its USB adapter.
  2. With the supplied micro-USB cables, connect the adapter(s) to the computer.

     

    If you can't connect all the sensors that were used for capturing data because you used more sensors that you have USB ports, connect the sensors to the available ports. You will be able to connect the remaining sensors later. For more information, see Download a trial when some sensors are not connected.
  3. On your computer, start Capture.U Desktop.

  4. To confirm that one or more sensor(s) is connected to Capture.U Desktop, click either Process or Sensors.
    All connected sensors are displayed.



     

Capture.U icons on the Captures tab

The following icons are displayed on the Captures tab to indicate the status of the sensors:

IconMeaning
Blue Trident sensor is connected to Capture.U Desktop.
Blue Trident sensor is not connected to Capture.U Desktop.
Blue Trident sensor was selected for the trial, but no data has been recorded or data has been erased.
Blue Trident sensor data has been downloaded for the trial.

Download a trial from the sensors

The following steps describe how to download a trial from the sensors where all the sensors used for the capture are connected, no data is missing, and you have not yet set up one-click downloading. For information on other scenarios, see also:

To download a trial from the sensors:

  1. Ensure your Blue Trident sensors are connected to your computer (see Connect sensors to Capture.U Desktop).
    If a red circle is displayed in the top right of the Sensors symbol, the Blue Trident sensors need a firmware update.



    Before attempting to continue, update the firmware (see Update sensor firmware).
    Note that you can't download trials that were captured with the To Sensor capture mode until the sensor firmware has been updated.
  2. Click Process and on the Captures tab, under Select trial to download, click Edit & download to the right of the required trial.

     

    Depending on whether the selected trial contains global angles, the Process tab changes to one of the following views:

    • If the selected trial contains no global angles, the Process tab changes from the Captures tab to the Preview tab, showing preview data.

       

      Preview shows the Resultant acceleration, not the captured onboard data.

    • If the selected trial contains global angles, the Process tab changes from the Captures tab to the Preview tab, but no preview is displayed.



  3. If required, before downloading the trial, you can edit the capture to rename it, crop it, add notes, and/or change the Save location: 
    • To rename the trial, click in the Session and/or Trial fields.

       

    • To crop the trial, so that you download only the region of interest:
      1. Click the Crop button at the bottom right of the graph. 



      2. Select the required part of the trial by clicking on the graph then dragging over the region of interest.
        The selected region is indicated by a rectangle. If you need to adjust the size of the selected region, drag the sides of the rectangle.
        In the following example, the selected region excludes the start and end of the trial.

         

      3. Click Apply to crop the trial.

         

        The time of the trial changes to the cropped time.



    • To add notes, click in the Notes field (bottom left).

       

    • To choose the file type to download, select from:
      • CSV (raw data) The default setting. If your data includes global angles, they are available in the exported _lowg.csv files. They are exported as helical angles (x_deg, y_deg, z_deg) and in a quaternion matrix (qx, qy, qz, qr).
      • Aligned outputs:
        • X1D For importing captured To Sensor trials into Vicon Nexus. The X1D file consists of .imu and .system files, and is imported into Nexus. If your data includes global angles, when they are imported into Nexus, you can display them in the Graph pane.
        • CSV Exports synchronized sensor data as a CSV file, so that you can directly compare your IMU axes. For example, the low-G (16-G) accelerometer, which captures at 1125 Hz, is synchronized and aligned to the high-G (200-G) accelerometer, which captures at 1600 Hz. The CSV file has the filename suffix _aligned. If your data includes global angles, they are exported as helical angles, which are represented as x_deg, y_deg, z_deg, and in a quaternion matrix, represented as qx, qy, qz, qr.
        • Output Rate The rate to which exported CSV data is aligned. Select Output Rate and enter a number between 25 and 3200 Hz. If you don't select the Output Rate, the data is aligned to the highest capture rate (ie, high-G acceleration), so all data aligns to 1600 Hz.
          The output rate applies to both the aligned CSV and X1D file to align all data to this rate.

            

    • To change the location for downloaded trials, click Save to.
      This displays the File Explorer, enabling you to select the required folder.

       

  4. When you have finished editing the trial, click Download to save the trial data to your computer.



    An orange progress bar indicates the download status.
    When the trial has finished downloading, the trial is labeled Downloaded and green check marks are displayed on each sensor.

     

    The trial data and any notes you created are saved in the Save to folder.



    If you chose the Aligned CSV export option, all the synchronized and aligned CSV files include _aligned on the CSV export.



    If you chose X1D export option, the X1D file is exported as .imu and system files.



    You can then load this file into Nexus.



Download a trial when some sensors are not connected

If you can't connect all the sensors that were used for capturing data because you used more sensors that you have USB ports, connect the sensors to the available USB ports. You will be able to connect the remaining sensors later.

To download a trial when some sensors are not connected:

  1. Connect sensors to the available USB ports on your computer (see Connect sensors to Capture.U Desktop).
  2. Select Process and on the Captures tab, notice that connected sensors are displayed in blue and sensors that are not connected are displayed in gray.
    This example shows a trial that was captured with two sensors, but with only one of the sensors connected.



  3. Under Select trial to download, click Edit & download to the right of the required trial.
    On the Preview tab, a message warns you that not all sensors are connected.

     

  4. Edit the trial if required (see Step 3 in Download a trial from the sensors). To ensure data formatting is consistent, any cropping of the data of the connected sensors is automatically applied when you connect the remaining sensors.
  5. When you have finished any editing, click Download.
    When the trial has been downloaded, it is labeled Partially Downloaded.



  6. Connect the remaining sensor(s) to the computer.



  7. Select the trial.
    On the Preview tab, notice that the Crop button is unavailable, to ensure the data is formatted in the same way as the previously connected sensors.
    If you cropped the trial when you connected the first set of sensors, the trial is automatically cropped in the same way as the previously connected sensors.



  8. Click Download.
    When data from all the sensors has been downloaded for the associated trial, green check marks are displayed for each sensor.

     


Download a trial when sensor data has been erased

  1. If you deleted data from one or more sensors that were used in a trial before downloading the data, when you connect the relevant sensor(s), any sensor with deleted data is displayed with a red cross on the Captures tab:



    You can still download data from the other sensors, but when you select the trial, a message warns you that some data is missing.



  2. To continue, select Download anyway.
  3. Edit the trial if required (see Step 3 in Download a trial from the sensors) and then click Download.
    When the trial has been downloaded for all sensors, on the Captures tab, you are warned that the trial has not been discovered on all the required sensors.

Download with a single click

When you have captured trials in To Sensor mode, you can download your data with a single click to a location and format you have previously chosen. You first set the required download options in the Settings tab, and then go to the Process tab and click the Download option for the required trial(s).

To specify the options for one-click download:

  • On the Settings tab, set the data export options, which will be used for one-click download. These include the Save To location and the file format options for data export (e.g. X1D and CSV).



    To change the file type to download, select from:
    • CSV The default setting
    • Aligned outputs:
      • X1D For importing captured To Sensor trials into Vicon Nexus. The X1D file consists of .imu and .system files, and is imported into Nexus.
      • CSV Exports synchronized sensor data as a CSV file, so that you can directly compare your IMU axes. For example, the low-G (16-G) accelerometer, which captures at 1125 Hz, is synchronized and aligned to the high-G (200-G) accelerometer, which captures at 1600 Hz. The CSV file has the filename suffix _aligned.
      • Output Rate The rate to which exported CSV data is aligned. Select Output Rate and enter a number between 25 and 3200 Hz. If you don't select the Output Rate, the data is aligned to the highest capture rate (ie, high-G acceleration), so all data aligns to 1600 Hz.
        The output rate applies to both the aligned CSV and X1D file to align all data to this rate.

To select one-click download for data export:

  • On the Process tab, select the Download option for each capture To Sensor session.



    The aligned data is generated in a CSV file with the filename suffix _aligned. If you selected X1D, an X1D file is generated (consisting of .imu and .system files, which are imported into Nexus).
    Subsequent exports from this session are exported using the options you chose on the Settings tab.

    When you use one-click download, you can't trim the data. If you need to trim the data, use the Edit & download option.
    When you select Edit & download, the settings information is populated into the Preview pane.

Edit a downloaded trial

To change a trial that you have downloaded (for example, if you want to crop the trial), provided that you haven't deleted the data from the sensor, you can re-download the trial and make the required changes.

  1. With the relevant sensor connected, select Process and on the Captures tab, select the required trial. 
    A message notifies you that this session has already been downloaded and asks if you want to continue.



  2. Click Continue.
    You can then edit the trial as required and download in the same way as the original download (see Download a trial from the sensors).


    If you haven't changed the session/trial name and Save location, the trial export files are only differentiated by their download time.

Manage connected sensors

To manage connected sensors, in the main Capture.U Desktop window, click Sensors.

From here you can update the firmware (see Update sensor firmware), delete data from the sensors (see Erase data from sensors), and display detailed information about each one.

At the top left of the window, the number of connected sensors is displayed.

For each connected sensor, the following information is displayed (left to right):

  • Sensor ID number
  • Percentage of storage available for the sensor
  • Battery percentage. Connected sensors are charged if they are not already fully charged.

For further information, click the downward arrow.

The following details are displayed:

  • Sessions: Number of recorded trials on the sensor
  • Firmware version

Erase data from sensors

To remove unwanted data from your sensors, you can delete it in one of these ways:

Erase data from a single sensor

To erase data from one or more sensors, you can delete the data using the relevant Erase button on the Sensors tab.

To erase data from a sensor:

  1. Ensure the sensor(s) from which you want to erase data is connected.
  2. Click Sensors and then for the required sensor, click Erase data.
    A message notifies you that all data will be erased from the sensor and you're given the opportunity to confirm or cancel.



  3. To delete the data from the sensor, click Erase.
    When the data has been erased from the sensor, the Erase button is disabled and if you click the down arrow, you can see that the Sessions information now shows a zero.

Erase data from all connected sensors

To erase sensor data from all connected sensors:

  • On the Sensors tab, click Erase all sensors.

Update sensor firmware

Capture.U Desktop enables you to upgrade your Blue Trident sensors to the latest firmware.

To update sensor firmware:

  1. If your sensors aren't plugged in, connect them to the computer (see Connect sensors) and launch Capture.U Desktop.
    On both the Process tab and the Sensors tab, the connected sensors display a red circle to let you know that firmware needs to be upgraded.
  2. Click Sensors on the left.
    Capture.U Desktop informs you of the availability of a firmware upgrade.

     

  3. Click Upgrade firmware.
    The status changes to Firmware upgrade in progress.
  4. When the firmware has finished updating, you can expand the displayed information to view the updated firmware number on the Sensors tab.



  5. If other sensors need to have their firmware upgraded, repeat the above steps for each one.

    If one or more sensors fails to upgrade, try disconnecting the sensor(s) from the computer and entering bootloader mode. To do this, hold down the USB adapter button on the sensor for at least 10 seconds. Release the button and wait 60 seconds for the sensor to exit bootloader mode, then reconnect and relaunch Capture.U Desktop. Retry upgrading the firmware as described above.

  6. You can now download trials that were captured using the To Sensor capture mode (see Download a trial from the sensors and  Capture to sensor).

Load updated firmware (9.x) to upgrade Blue Trident sensors

If new Blue Trident sensor firmware becomes available (that is, firmware later than 9.0.4), add this file to Capture.U Desktop either by clicking or dropping the firmware file onto the Sensors tab.

To revert back to 9.0.4 firmware, remove the added firmware file by deleting the firmware file located in:

C:\Users\Username\AppData\Roaming\Capture.UDesktop\firmware

Get help on Capture.U

To get help on using Capture.U:

  1. Start Capture.U Desktop and click Help.



  2. Choose from the following options:
    • Guides* Visit the Vicon IMU documentation web page.
    • FAQs* Visit the Vicon FAQs web page.
    • Support* Visit the Vicon Support web page.
    • Start walkthrough. Launch a quick tour of Capture.U Desktop.
      To use this option, ensure that you have first captured data using the To Sensor capture mode in the Capture.U app and connected the sensor(s) to the computer.
      To end the walkthrough at any stage, click Help and then click End walkthrough.
    • Version check. Click the version number (bottom right) to display more detailed version information about Capture.U Desktop.

* Internet access required

Known issues for Capture.U Desktop

IssueWorkaround
Downloaded High G accelerometer data may exhibit "latching". This is where, when the data becomes close to zero, its value is automatically rounded to zero.None