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ISCAN Serial Tracker Element

Modified on 2018/08/22 01:18 by Administrator Categorized as Elements, Eye Trackers


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

Synchronized actions

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


NameDescription                              ConstraintsTypeOn
Port Name        System name of the serial port connected to the ISCAN computer                String         
Baud Rate        Defines the serial baud rate                String         
Stop Bits        Defines a number of stopbits per transferred byte                StopBi..         
Parity        Defines the parity-checking protocol                Parity         
Data Bits Number        Defines the number of data bits in each transferred byte                Int32         
Send Marker Now        Assign a value between 0 and 127 in realtime code to send a synchronization marker to the ISCAN computer                Int32         
Radar Point        Returns the newest calibrated tracking position provided by the tracker at runtime                clPoint         
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         
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         
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         
Perspective Correction
Perspective Correction        Defines...                Boolean         
Configure Perspective                        Boolean         
Viewer Position        Defines...                Point3D         
Tracker Position        Defines...                Point3D         
Focal Length        Defines...                Double         
Is Enabled        If set to false the element is completely omitted when the experiment is run                Boolean         
Title        Title of the element                String         

ISCAN Serial Tracker Element enables reading ISCAN eye-tracking data, when the ISCAN PC is configured to send the data in the binary format via a serial port. For configurations with analog channels and DAQ boards, use the tracker elements from the DAQ AddIns.




Snapshot 1

Snapshot 1

Snapshot 2

Snapshot 2

Practical Use


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..


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