||Infrared video. Dark pupil. Monocular
or binocular options.
||The user can select between three methods:
Pupil only, corneal reflection only, or both together.
||Approximately 0.25° - 1.0° visual arc
|Parallax Error Correction
||Parallax error correction provided in
the binocular system for viewing distances different from
the original calibration distance.
||Approximately 0.15° visual arc
||selectable by the user between 60 Hz
and 30 Hz.
||Default camera is: Color, diagonal=70°,
|Pupil size resolution
||Measures pupil height and width to better
than 0.03 mm instantaneous (no averaging).
||Calibration is performed relative to
the pixels of the CCD array, not the image content. This
is analogous to calibrating relative to the CRT screen
and not the image displayed on it.
For accurate position of gaze, calibration is required
only once per subject. New subject setup time approximately
5 minutes. Calibration settings can be stored and reused
each time a subject returns.
Easy Slip Correction feature and re-presentation of stray
||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.
||Automatic blink detection and suppression.
||Eye data: X, Y position of gaze, pupil
height and width, ocular torsion, delta time, total time,
and fixation durations.
Asynchronous records include: Synchronization markers,
key presses, data from other programs. Data is stored
in ASCII files.
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.
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.
Selectable unipolar or bipolar voltage ranges: +/- 10,
Selectable data items: position of gaze (x,y), pupil (h,w),
velocity (dx,dy), and raw pupil, glint or vector data.
TTL capabilities. 2 or 4 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.
full real-time synchronization across machines via the
||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,
ocular torsion, pupil width and pupil aspect ratio etc.
||OS: Windows XP, Vista
Machine: 2.8 GHz Pentium 4 or higher / Athlon XP 2800+
||The ViewPoint software can be configured
to accommodate a wide variety of OEM hardware. Resolution
and accuracy will then depend on the OEM camera and hardware
|*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