|
Item |
Specs |
|
Tracking Method |
Infrared video. Dark pupil. Monocular or binocular options. |
| Software |
PC desk top or lap top |
| Measurement principle |
The user can select between three methods: Pupil only, corneal reflection only, or both together. |
| Accuracy* |
Approximately 0.25° - 1.0° visual arc |
| Spatial resolution* |
Approximately 0.15° visual arc |
| Temporal resolution |
400 fps, 220 fps or 90 fps (depending on license purchased) |
| Pupil size resolution |
Measures pupil height and width to better than 0.03 mm instantaneous (no averaging). |
| Calibration |
ViewPoint starts in a roughly calibrated state that is adequate for determining screen quadrants or other relative movement measurement such as objective preference-of-looking tasks.
For accurate position of gaze, calibration is required only once per subject. New subject setup time between 1-5 minutes. Calibration settings can be stored and reused each time a subject returns.
Easy Slip Correction feature and re-presentation of stray calibration points. |
| Auto threshold |
The program scans over the video image for the pupil and / or for the corneal reflection. The luminance threshold for discriminating these can be adjusted. The auto threshold feature provides good threshold levels automatically. Little or no manual adjustment required. |
| Blink suppression |
Automatic blink detection and suppression. |
| Data recorded |
Eye data: X, Y position of gaze, pupil height and width, ocular torsion, delta time, total time, and regions of interest (ROI).
Asynchronous records include: State transition markers, key presses, data from other programs.
Data is stored in ASCII files. |
| Real-time communication |
Same computer:
Software Developers Kit (SDK) supplies everything you need for seamless interface between ViewPoint and your program. This includes: DLL with shared memory, .h and .lib files plus sample source code written in C Language.
Serial port:
Sends eye data packets and asynchronous packets equivalent to information in ASCII data files at rates of up to 56K.
Receive real time data from other programs and store it asynchronously into data files.
AnalogOut option:
Selectable unipolar or bipolar voltage ranges: +/- 10, 5, 2.5
Selectable data items: position of gaze (x,y), pupil (h,w), velocity (dx,dy), and raw pupil, glint or vector data. TTL capabilities. 2, 4 or 8 channel options.
TTL in/out option:
Eight TTL input channels are interfaced to place marker codes into the ViewPoint data file or to trigger instructions.
Eight TTL output channels that can indicate for example when the position of gaze is inside ViewPoint region of interest areas ROI-0 to ROI-7.
Ethernet:
full real-time synchronization across machines via the ethernet. |
| Real-time display |
Gaze position and fixation duration displayed over scene image as the subject views it.
Real-time pen plots of X and Y position of gaze, velocity, pupil width and pupil aspect ratio etc.
Ocular Torsion may be purchased as an ad on option. |
| System requirements: |
OS: Windows 7, Windows 8, Windows 8.1, Windows10
|
| OEM Support |
The ViewPoint software can be configured to accommodate a wide variety of OEM hardware. Ask us about OEM level systems. |
*Arrington Research takes performance measurements during actual use with human subjects. Better results than stated are possible under artificial conditions but are almost never achieved in reality. Performance terms used are defined below:
Accuracy: The expected difference in degrees of visual angle between true eye position and mean computed eye position during a fixation.
Spatial Resolution: The smallest change in eye position that can be measured.
Specifications and design are subject to change without notice. |
