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LSL Tracker Element

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Modified on 2018/08/22 01:13 by Administrator Categorized as Elements, Eye Trackers

Summary

Element Icon LSL Tracker
Info
Category: Eye trackers AddIn: LSL
Creator: OkazoLab Scope: Experiment
Owns Snippets: None Usage: Snippets

Synchronized actions

EpochActions
On Experiment Start                        Starts processing tracker samples
On Experiment Start                        Stops processing tracker samples

Properties

NameDescription                              ConstraintsTypeOn
runtime
change
LSL Settings
Stream Type        Defines the LSL stream that delivers signal data                String         
LSL Stream        Defines which LSL stream will be connected at runtime. You must have the LSL stream running, when you change this property for the first time. Note that the channel configuration of the element is updated each time as you change this property                String         
X Channel        Defines the LSL channel for X coordinates                Int32         
Y Channel        Defines the LSL channel for Y coordinates                Int32         
Chink Size        Defines the chuck size (in ms) in signal acquisition                clTime         
GLM Calibration
Run GLM Calibration        Runs the GLM calibration procedure, which calculates two pairs of linear coefficients for mapping of the tracker input into the screen coordinates. The calculated coefficients are automatically applied at runtime.                Boolean         
Gain X        Defines the gain coefficient for the X axis in the GLM calibration model: X='GainX'*x+OffsetX                Double         
Gain Y        Defines the gain coefficient for the Y axis in the GLM calibration model: Y='GainY'*y+OffsetY                Double         
Offset X        Defines the offset coefficient for the X axis in the GLM calibration model: X=GainX*x+'OffsetX'                Double         
Offset Y        Defines the offset coefficient for the Y axis in the GLM calibration model: Y=GainY*y+'OffsetY'                Double         
Affine Mode        Defines the affine transformation (scale, translation and rotation) is used for calibration instead on the simpler GLM transformation (scale and translation)                Boolean         
Affine Rotation        Defines the rotation angle (deg) for the affine calibration                Double         
Save Calibration Now        Provides a runtime command that saves the current GLM calibration into a XML file. To run the command at runtime, assign a file name to this property.                String         
Load Calibration Now        Provides a runtime command that loads the GLM calibration values from a XML file. To run the command at runtime, assign a file name to this property.                String         
Drift Correction
Recalibrate Now        Runtime command that helps to correct drifts in tracking data.Correction is done by recalibration of the latest tracker position into a custom screen point defined by the 'Recalibration Point' property.nAs result, the offsets of the GLM calibration get adjusted (but not gains) to compensate a drift in further data.                Boolean         
Recalibration Point        Defines the screen point to which the tracker position will be recalibrated on calling 'Recalibrate Now' action. The default auto value always denotes the screen center.                clPoint         
Filters
Smoothing Ratio        Defines a ratio for the fast FIR smoothing filter, which is applied to the gaze tracking within EventIDE. The filter convolves every new tracking position with the previous ones. The property value defines a tap weight for the previous data, such that the convolution looks like: X=(Xn*(1-Ratio)+Xn-1*Ratio)/2. The value has to be positive and less than 1 (0 means no filtering).                Double         
Logging
Log Folder        Opens the dialog for selecting a local folder that will hold all tracking logs                String         
Open Log Designer        Opens a designer window where the log format can be defined.                Boolean         
Is Logging        Defines whether logging is turn on/off.The value can be changed at any moment at runtime allowing selective logging during the relevant periods only.                Boolean         
User Field        Defines the custom user data that is added to every line in the log file. The property can be used for recording varying status information (e.g. trial number) together with the tracker data. The string value may contains multiple fields separated by delimiter.                String         
Runtime
Radar Point        Returns the newest calibrated tracking position provided by the tracker at runtime                clPoint         
Perspective Correction
Perspective Correction        Defines...                Boolean         
Configure Perspective                        Boolean         
Viewer Position        Defines...                Point3D         
Tracker Position        Defines...                Point3D         
Focal Length        Defines...                Double         
Control
Is Enabled        If set to false the element is completely omitted when the experiment is run                Boolean         
Title        Title of the element                String         

LSL Tracker Element enables support eye-trackers connected by the LSL protocol.

Description

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Snapshots

Snapshot 1

Snapshot 1

Snapshot 2

Snapshot 2

Practical Use

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Technique 1

  1. Step 1
  2. Step 2
    ...
    === Technique 2 ===
  3. Step 1
  4. Step 2
    ...

     // Check the trial outcome. Result and RT just other user variables
    
    // insert code snippet here..
               
    ...
    == Notes ==
    ...
  5. Insert Notes here..
  6. Insert Notes here..

 
  Name Size
- LSL-Tracker-Element-Icon.png 4.37 KB

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