SR Research EyeLink II Scene Camera Manuale utente

EyeLink®II Scene Camera User Manual

(SceneLink Application version 1.2.1)

EyeLink is a registered trademark of SR Research Ltd., Toronto, Canada

Table of Contents

1. Introduction...................................................................................................................1

2. EyeLink II Tracker Application: Scene Camera Components ................................2

2.1 Camera Setup Screen .......................................................................................... 2

2.1.1 Purpose ....................................................................................................... 2

2.1.2 Main Functions ........................................................................................... 3

2.1.3 Key Shortcuts .............................................................................................. 6

2.2 Video Setup Screen............................................................................................. 7

2.2.1 Purpose ....................................................................................................... 7

2.2.2 Main Functions ........................................................................................... 7

2.2.3 Key Shortcuts ............................................................................................ 10

2.3 Scene Camera Alignment Screen...................................................................... 11

2.3.1 Purpose ..................................................................................................... 11

2.3.2 Main Functions ......................................................................................... 11

2.3.3 Key Shortcuts ............................................................................................ 12

2.4 Scene Camera Depth Setup Screen................................................................... 12

2.4.1 Purpose ..................................................................................................... 13

2.4.2 Main Functions ......................................................................................... 13

2.4.3 Key Shortcuts ............................................................................................ 14

2.5 Record Screen ................................................................................................... 15

2.5.1 Purpose ..................................................................................................... 15

2.5.2 Main Functions ......................................................................................... 15

2.5.3 Key Shortcuts ............................................................................................ 16

3. Setting up and Configuring the SceneLink Application .........................................17

3.1 System Requirements........................................................................................ 17

3.2 Installing Scene Camera ................................................................................... 17

3.3 Wiring and Configuration................................................................................. 19

3.3.1 Setting up the Overlay Box ....................................................................... 20

3.3.2 Setting up the Digital Video Converter..................................................... 21

3.3.3 Recording Audio Data .............................................................................. 21

3.3.4 Using a Dell D-Series Laptop as Host PC................................................ 22

3.4 Software Installation ......................................................................................... 22

3.4.1 Host PC..................................................................................................... 22

3.4.2 Display PC................................................................................................ 22

3.5 Checking Firewire Connection ......................................................................... 23

3.6 Configuring SceneLink Options ....................................................................... 24

3.7 Checking SceneLink Connections and Settings ............................................... 26

3.7.1 Seeing Tracker Graphics .......................................................................... 28

3.7.2 Seeing a Gray Screen................................................................................ 28

3.7.3 Seeing a Black Screen............................................................................... 30

4. Performing Recording with the SceneLink Application .........................................32

4.1 Modes of Operation .......................................................................................... 32

4.2 Idle (Preview) Mode ......................................................................................... 33

4.3 Display Area Detection Mode .......................................................................... 33

4.4 Scene Camera Alignment Mode ....................................................................... 36

4.5 Calibration Mode .............................................................................................. 38

4.5.1 Calibration Colors.................................................................................... 39

4.5.2 Physical Coordinates Settings .................................................................. 39

4.6 Depth Correction Mode .................................................................................... 40

4.7 Output Mode ..................................................................................................... 42

4.8 Record Mode..................................................................................................... 43

4.8.1 Problem with Recording ........................................................................... 44

4.8.2 Synchronization with Third-Party Recording Devices ............................. 44

4.8.3 Performing Online Drift Correction......................................................... 45

4.8.3.1 Online Drift Correction from the Display PC....................................... 45

4.8.3.2 Online Drift Correction from the Host PC............................................ 46

4.9 Recording Options ............................................................................................ 47

4.10 Strip Chart......................................................................................................... 48

4.11 Closing Recording Session ............................................................................... 48

4.12 Exiting the SceneLink Application................................................................... 49

5. Data Playback with SceneLink Application.............................................................50

5.1 Opening a Playback Session ............................................................................. 50

5.2 Playing back a Recording Session .................................................................... 51

5.3 Saving a Recorded Trial.................................................................................... 53

5.4 Mapping Gaze Data to Digital Video Coordinates and Getting Frame Number

in the ASC File.............................................................................................................. 54

5.5 Exiting the SceneLink Application................................................................... 55

List of Figures

Figure 2-1: EyeLink II Camera Setup Screen..................................................................... 2

Figure 2-2: EyeLink II Video Setup Screen ....................................................................... 7

Figure 2-3: EyeLink II Scene Camera Alignment Screen ................................................ 11

Figure 2-4: EyeLink II Scene Camera Depth Setup Screen ............................................. 13

Figure 2-5: EyeLink II Record Screen.............................................................................. 15

Figure 3-1: Remove Screws on the Head Camera Bracket............................................... 18

Figure 3-2: Insert Scene Camera between the Head Camera Clamp and the Head Camera

Bracket ...................................................................................................................... 19

Figure 3-3: Dress the Scene Camera Cables..................................................................... 19

Figure 3-4. EyeLink System Connection in a Scene Camera Recording ......................... 20

Figure 3-5: Wiring Diagram for Scene Camera Option.................................................... 21

Figure 3-6. Version of DirectX Installed on the Display PC........................................... 23

Figure 3-7. Error in Detecting the DV Connection........................................................... 24

Figure 3-8. General Tab of the Preferences Dialog Box .................................................. 25

Figure 3-9. Strip Chart Tab of the Preferences Dialog Box ............................................. 25

Figure 3-10. Advanced Tab of the Preferences Dialog Box............................................ 26

Figure 3-11. Openning a Recording Session. .................................................................. 27

Figure 3-12. Initial View of the SceneLink Application .................................................. 27

Figure 3-13. Unzoomed Tracker Graphics ....................................................................... 28

Figure 3-14. Gray Background Over Video, Check EyeLink2 Settings........................... 29

Figure 3-15. Missing Scene Camera Buttons ................................................................... 30

Figure 3-16. Blank Screen in the Video Window............................................................. 31

Figure 4-1. Modes of Operation for SceneLink Recording ............................................. 33

Figure 4-2. Example of Unzoomed Host Screen Overlay ................................................ 33

Figure 4-3. Adjusting the Size of Overlay Display.......................................................... 34

Figure 4-4. Beginning Display Area Detection ............................................................... 35

Figure 4-5. Successful Display Area Detection................................................................ 36

Figure 4-6: Optical Alignment between the Scene Camera and Head Camera................ 38

Figure 4-7: Updating Physical Coordinate Settings......................................................... 39

Figure 4-8. Calibrated Space Viewed in the Overlay Display.......................................... 41

Figure 4-9. Scene Camera Depth Correction.................................................................... 41

Figure 4-10. Recording Screen ......................................................................................... 43

Figure 4-11. Problem during Recording: "No EDF Time".............................................. 44

Figure 4-12. Performing Online Drift Correction............................................................ 46

Figure 4-13. Preference Settings....................................................................................... 47

Figure 4-14. Optional Settings for SC Recording............................................................ 48

Figure 4-15. SceneLink Strip Chart Window ................................................................... 48

Figure 4-16. Error in Closing a Recording Session .......................................................... 49

Figure 5-1. Creating Lookup Table for a Recording ........................................................ 50

Figure 5-2. Error in Finding Fame-to-Time Lookup Table ............................................. 51

Figure 5-3. Scene Camera Recording Playback .............................................................. 52

Figure 5-4. Trial Navigation Controls .............................................................................. 53

Figure 5-5. Saving a Recording Trial as an AVI File ...................................................... 53

List of Tables

Table 1. Playback Trial Control........................................................................................ 52

CONTACT ADDRESS

SR Research Ltd.

5516 Main St., Osgoode, Ontario, Canada K0A 2W0

Fax: 613-482-4866

Phone: 613-826-2958

Toll Free Phone: 1-866-821-0731 (North America Only)

Email: [email protected]

http://www.sr-support.com/

1. Introduction

The standard EyeLink II setup allows users to record eye movements at a fixed

viewing distance (e.g., computer monitor, TV, projected screen, etc). The

EyeLink scene camera option provides a powerful extension so that

participants’ gaze position can be tracked on a real world scene video being

captured from a head mounted scene camera. With horizontal disparity

information from binocular recording capability of the EyeLink tracker, the

scene camera option provides a build-in parallax error correction, which

permits accurate gaze overlay regardless of viewing depth relative to calibration

plane.

In a scene camera experiment, either a color or high resolution black and white

scene camera is used to generate 30 Frames (60 fields) of scene video recording

per second. The scene video is streamed to an external video overlay box,

which can be used to superimpose real-time overlay graphics (current gaze

position, time stamp, etc.) generated by the EyeLink II tracker on the video

source. The composite output can then be displayed on a TV monitor and

recorded by a VCR or DVD recorder. Alternatively, the SR Research SceneLink

application can be used to save the scene camera video as digital video (in .AVI

file format) without any gaze overlay graphics. A binary millisecond time code is

written to every scene camera field to allow for excellent synchronization

between the EyeLink gaze data and scene video. The SceneLink application is

used to merge these two sources of data to create overlay graphics during

playback.

This manual is for use with the EyeLink scene camera option together with the

SceneLink application. Please send all bug reports and comments to SR

Research Ltd ([email protected]).

2. EyeLink II Tracker Application: Scene Camera Components

The EyeLink II tracker interface consists of a set of setup and monitoring

screens, which may be navigated by means of the host PC mouse, shortcut

keys, or from the display PC application via link commands. The EyeLink host

application has been modified so that a scene camera recording can be

performed. The current chapter serves as a supplement to the “EyeLink II User

Manual” and only highlights those operations and components that are relevant

to the use of scene camera option on the EyeLink II host application.

2.1 Camera Setup Screen

Figure 2-1: EyeLink II Camera Setup Screen

2.1.1 Purpose

This is the central screen for most EyeLink II setup functions. From this screen

(see Figure 2-1) the eye and head tracking cameras can be set up, and their

images can be thresholded. Eye(s) to be tracked, tracking mode and options

can also be set. Calibration, validation, drift correction, and scene camera

operations (e.g., video setup, camera alignment, and depth correction) can also

be performed from this screen.

2.1.2 Main Functions

Press Auto Threshold to threshold the

selected camera image. In most cases

auto thresholding will set the correct

image threshold for the camera.

Keys: A = Auto threshold selected

image

Use the arrow buttons to manually

increase or decrease the selected

camera’s pupil threshold.

Keys: ⇑and ⇓= increase and decrease

threshold

If available, use the arrow buttons to

manually increase or decrease the

selected camera’s corneal threshold.

Keys: + and - = increase / decrease

corneal reflection threshold

If available, use the arrow buttons to

manually increase or decrease the

head camera threshold.

Keys: ⇑and ⇓

Select the tracking mode for recording.

Here the Pupil-Corneal Reflection

mode is selected.

Keys: P toggles Pupil only or Pupil-CR

mode selection

Select the sampling rate for recording.

Here 250 Hz is selected. Note that in

Pupil-CR mode, 500Hz is not available.

Keys: F = toggles sampling Frequency

selection

Toggles display of crosshair in eye

camera images.

Keys: X = toggle crosshair display

Toggles display of threshold coloring in

eye camera images.

Keys: T = toggle threshold coloring

display

Select to present the camera display

image on the Display Monitor.

To select the camera to display as a

large image click on the desired image

thumbnail. The selected image

thumbnail has a heavy border around

it. Here the Right Eye camera is

selected. Image thresholds and status

are indicated below each thumbnail.

Keys: ⇐and ⇒to move left or right

on image row

Select the eye(s) to track during

recording. Here the Right eye is

selected. Press the “Lock Tracked Eye”

button to lock the current selection on

the display PC.

Keys: R = select Right Eye

L = select Left Eye

B = select Both Eyes

Press Exit Setup to go to the screen

that was available prior to accessing

the Camera Setup window.

Keys: ESC = exit camera setup

Press Offline to be returned to the

EyeLink II offline screen.

Keys: ESC = go to Offline screen

Select Output / Record to go to the

output screen, from which you can

start a manual recording session. This

button is usually only accessed when

using the EyeLink II in standalone

mode.

Keys: O = go to Output screen

Select Set Options to go to the EyeLink

II options screen, where a variety of

system options and settings can be

configured. Note that any value on this

screen can be programmatically

overridden by the API during

experiment setup.

Keys: S = go to Set options

Press Help (F1) to access the online

help page for Camera Setup. All

available key shortcuts are also listed

on the Help screen.

Keys: F1 = open Help screen

Select Calibration to go to the

Calibration screen. After setting up the

eye cameras and thresholding, you

need to Calibrate the system.

Keys: C = go to Calibrate screen

Select Validation to be taken to the

Validation Screen. Validation allows

you to get a sense of the gaze position

accuracy of your Calibration.

Validation should always be run after

Calibration.

Keys: V = go to Validate screen

Select Drift Correction to go to the

Drift Correction Screen. Drift

Correction can be performed before

and during an experiment; allowing

gaze position to be realigned if

headband slippage or significant pupil

size change has increased gaze

calculation error.

Keys: D = go to Drift correction screen

Perform video overlay or scene camera

setup. This is used to ensure accurate

gaze position mapping onto the overlay

device. If video alignment is not

properly carried out, the accuracy of

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