SceneLink is the program that allows Display pc access to the Scene Camera output on the EyeLink II systems. It allows easier calibration and recording




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NameSceneLink is the program that allows Display pc access to the Scene Camera output on the EyeLink II systems. It allows easier calibration and recording
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SceneLink is the program that allows Display PC access to the Scene Camera output on the EyeLink II systems. IT allows easier calibration and recording.
A few pieces of hardware are involved:
1. the green Video Overlay box

-a green overlay box which mixes signals from the Host PC and the scene camera -the crucial settings for this box are 'black' background and NTSC (if you wish PAL, consult the documentation)

-turn the box on using the remote or using a button on the back; by default it is in standby mode

-press the mode button either on the back of the box or on the remote and change it to overscan
2. a white Digital Video Converter takes an analog video input from the Video Overlay box and converts it to a digital format - it uses firewire which plugs into the Display PC running SceneLink

-it is CRUCIAL that the white digital video converter recognize that there is an analog source as input - as indicated by the lighting of the right blue light on the front

-the easiest way to get this to occur, is upon starting the computer, have the firewire cable unplugged from the back of the white Video Converter box
-power up the Display PC and Host PC

-press the source button on the white Video Converter box until it recognizes the analog video input (blue light on the right is lit)

-now insert the firewire cable in the back (other end to the firewire port on the Display PC) and Windows should recognize the input

-next run SceneLink where you can verify that it is picking up the signal by selecting the Preferences menu - it should say "Playing" under video source
Quick SceneLink Set Up (see the manual if this does not trip your memory):
1. the first step after OPENing a news session, is to Detect the Display area of the incoming video stream that corresponds to the portion being sent by the Host PC - in this is encoded informtion so this is an important step

- a crawling box's position should be adjust so that it falls within the pink guides that are drawn; first set the top and left boundaries, click on select, then adjust the bottom and right boundaries

-once the boundaries are set, click on next, and try to "Detect" the coded signal - if all is well, the system will say "Detect OK"

2. Next, Calibrate and Validate the subject

-the better the calibration and validation, the better the SceneLink session will be; pay particular attention to getting a good corneal reflection measure (recall that the infrared source for the corneal reflection is in the black bar that holds the Scene Camera, and that adjusting its height to be closer to the eyes may be beneficial)

3. After calibration, we need to align the scene and headcameras; mark/click the 4 quadrants of the scene by having the subject look at the display so that one infrared marker - try to keep the subject as still as possible

5. next do a depth correction by sampling at least 3 points a different depths - the experimenter should do the clicking of the targets on the screen

6. RECORD!!! Yay

7. once the session is closed, build a lookup table for the EDF file/project... in a SceneLink Playback Session - this must also be performed before looking at the data in Data Viewer - as does changing a couple of preferences (search for Scenelink in the online Data Viewer help)
TIP:  -if you run into problems of the converter box not detecting the video signal and the computers are already running, unplug the video and firewire from the white converter, put the green overlay box into standby mode, plug in the firewire to power the white converter box, insert the video feed to th Video IN on the front and select ANALOG by pressing the source button on the top, and power up the green converter box last... now with the ANALOG input selected, Windows should detect the video feed as revealed by seeing it say 'Playing' in the Preferences
Quick EyeLink System Hardware Configuration Tips:
Display PCs - any PC can be used for a Display PC; simply set the IP address to the static 100.1.1.x (where x is between 2 and 255) and subnet mask 255.255.255.0 then plug the crossed wire ethernet cable into the laptop (other end leads to the Host PC)
Setting the hardware up for use in a new setting:
-make sure all thumbscrews are securely tightened throughout to avoid disrutption in data flow (which will also freeze the camera and ethernet links and require rebooting)
EyeLink II - cable from the headgear and cable from the infrared markers plugs into the EyeLink II PCI card

-markers should be placed around the 4 corners of the viewed area (monitor) and then the distances between their centers and the monitor dimensions need to be updated in "C:\EYELINK2\EXE\PHYSICAL.INI'

-crossed-wire ethernet cable connects the ethernet port on the EyeLink II PCI card ihn the host (NOT the ethernet built into the Host PC) to the ethernet port of the Display PC

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