Floating-point sample. More...
Data Fields | |
| UINT32 | time |
| INT16 | type |
| UINT16 | flags |
| float | px [2] |
| float | py [2] |
| float | hx [2] |
| float | hy [2] |
| float | pa [2] |
| float | gx [2] |
| float | gy [2] |
| float | rx |
| float | ry |
| UINT16 | status |
| UINT16 | input |
| UINT16 | buttons |
| INT16 | htype |
| INT16 | hdata [8] |
| float | eyeInHeadX [3] |
| float | eyeInHeadY [3] |
| UINT32 | headMarkerFlags |
| float | headRotation [3] |
| float | headPosition [3] |
| float | headInSpaceX |
| float | headInSpaceY |
| float | unused_headInSpaceX [2] |
| float | unused_headInSpaceY [2] |
| float | hrgx |
| float | hrgy |
| float | ergx |
| float | ergy |
| float | ex [2] |
| float | ey [2] |
| float | emajor [2] |
| float | eminor [2] |
| float | eangle [2] |
Floating-point sample.
The EyeLink tracker measures eye position 250, 500, 1000 or 2000 times per second depending on the tracking mode you are working with, and computes true gaze position on the display using the head camera data. This data is stored in the EDF file, and made available through the link in as little as 3 milliseconds after a physical eye movement. Samples can be read from the link by eyelink_get_float_data() or eyelink_newest_float_sample().
If sample rate is 2000hz, two samples with same time stamp possible. If SAMPLE_ADD_OFFSET is set on the flags, add .5 ms to get the real time. Convenient FLOAT_TIME can also be used.
The difference between FSAMPLE and FSAMPEL2 is, the FSAMPEL2 has extra data specifically for EyeLink 3. The extra data defaults to 0 or MISSING if used with a preceding model of camera.
| UINT16 buttons |
button state & changes
| float eangle[2] |
pupil ellipse angle (pupil_ellipse_angle[2])
| float emajor[2] |
pupil ellipse minor axis (ef.minor)
| float eminor[2] |
pupil ellipse major axis (ef.major)
| float ergx |
resolution for eyeInHead
| float ergy |
resolution for eyeInHead
| float ex[2] |
pupil ellipse x
| float ey[2] |
pupil ellipse y
| float eyeInHeadX[3] |
eye alone gaze x. Uncompensated head gaze. left right, cyclopean.
| float eyeInHeadY[3] |
eye alone gaze y. Uncompensated head gaze. left right, cyclopean
| UINT16 flags |
flags to indicate contents
| float gx[2] |
screen gaze x
| float gy[2] |
screen gaze y
| INT16 hdata[8] |
head-tracker data (not prescaled)
| float headInSpaceX |
Head in space is the head movement contribution to on screen gaze. It is calculated by transforming the central fixation cyclopean eye-gaze vector by the head movement. The monocular central fixation gaze is a vector starting at the midpoint between the eyes and ending at the central calibration point. Note when in monocular mode this is taken based on the selected eye-gaze during the first calibration point (rather than cyclopean).
| float headInSpaceY |
Head in space is the head movement contribution to on screen gaze. It is calculated by transforming the central fixation cyclopean eye-gaze vector by the head movement. The monocular central fixation gaze is a vector starting at the midpoint between the eyes and ending at the central calibration point. Note when in monocular mode this is taken based on the selected eye-gaze during the first calibration point (rather than cyclopean).
| UINT32 headMarkerFlags |
Head marker flags provides marker warnings
| float headPosition[3] |
Head Posiion X first value at index 0, Y second value at index 1 and Z value at index 2
| float headRotation[3] |
Head Rotation X first value at index 0, Y second value at index 1 and Z value at index 2
| float hrgx |
resolution for headInSpace (cyclopean only)
| float hrgy |
resolution for headInSpace
| INT16 htype |
head-tracker data type (0=none)
| float hx[2] |
headref x
| float hy[2] |
headref y
| UINT16 input |
extra (input word)
| float pa[2] |
pupil size or area
| float px[2] |
pupil x
| float py[2] |
pupil y
| float rx |
screen pixels per degree
| float ry |
screen pixels per degree
| UINT16 status |
tracker status flags
| UINT32 time |
time of sample
| INT16 type |
always SAMPLE_TYPE
| float unused_headInSpaceX[2] |
head gaze x. one from the prespective of left eye (0), next prospective of right eye (1) the third one is cyclopean
| float unused_headInSpaceY[2] |
head gaze y. one from the prespective of left eye (0), next prospective of right eye (1) the third one is cyclopean