The Eye Tribe

I would like to determine angle – which direction tracked eye looks using its pupil coordinates?
I am not interested in specific point on screen, I would like to identify it absolutely in relation to specified tracker sample in history.
Without calibration, i.e. no gaze coordinates, screen dimensions and its resolution is known.

My question is linked to another one: What does it mean “Pupil coordinates are defined in normalized relative values” ?
Can it be interpreted in some units (meters, degrees) – relative to the tracker sensor etc.
(I am eventually able to fix and determine distance of the eye from the tracker sensor by myself)

Thank you

This topic might be of interest to you: http://theeyetribe.com/forum/viewtopic.php?f=27&t=361&p=1499

Uncalibrated 3D gaze vector is not available in the current SDK. It is mean for on-screen gaze point estimation which becomes available after a calibration.

Normalized values means that left side of the sensor is 0 and right side is 1. This goes for both vertical and horizontal direction. Relative means relative to the sensor, we convert to these values instead of using sensor-dependent column/row. 0.5/0.5 will always be center. You could potentially convert to Y/X/Z by measuring distance for the sensor to eyes as a function of the distance between the eyes at N distances and interpolate.

Hi everybody,
Anyone who has idea on what does fix dispersion mean. i am a little bit confused with the fix dispersion data

Thanks

Hi every one, i have another concern, but its related to biological point of view. are the pupil size for all human being are equal before constriction and dilation??
Please if any one has idea on this please assist me.

Thanks

kimarionizetha,

Short answer, no.

Long answer:

"The size of the iris is primarily a function of the overall size of the eye. In general, people who are far-sighted have smaller eyes and smaller irises. People who require no optical correction (emetropes) have average sized eyes. And people who are near sighted have large eyes. There are certain pathological conditions that can result in variations in the size of the eye such as congenital glaucoma."

"Now pupils, on the other hand, vary in size constantly according to light conditions. Constricting in bright light and dilating in dim light. Nevertheless, the amount of dilation/constriction varies between individuals so much that one person's pupils in a bright room might be smaller than another's in a dark one.

The primary determinent at any given time is the relative stimulation of the pupil dilator muscle and the pupil constrictor muscle. When we are excited, or scared, or aroused; our pupils dilate to allow the maximum amount of light in and increase our peripheral vision. It is thus part of our fight or flight response and stimulated by the simpathetic nervous system. On the other hand, when we're bored, tired, sleepy the parasympathetic system takes over and our pupils constrict.

Furthermore, we start out as babies with very small pupils. By the time we're teenagers, our pupils have reached their maximum size. Then, they begin shrinking and, by our seventies or eighties are usually quite small." (source)

Thanks Martin

Hi all
I am am a bit confused by the data i recorded using the eyeproof tool. What does Fix dispersion mean?

Hi everyone,
can anyone help me on this,
on the eyetribe specification its written that the TRACKING AREA IS 40CM X 30CM X 65CM. Can anyone elaborate more on this, i am confused and it seems the tracking area is very important in order to get the good result for any experiment.

Thanks