b.kominkova

8/23/2019 B.kominkova

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Comparison of two eye tracking

devices used on printed images

Barbora Komnkov

The Norwegian Color Research Laboratory

Faculty of Computer Science and Media Technology

Gjvik University College, Gjvik, Norway

University of Pardubice, Czech Republic

[email protected],http://www.colorlab.no,

Gjvik University College, 7.6.2007 ,


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Introduction

Aim

Experiment

Media Images

Description

Experimental results

Discussion and results What the next?

Content of presentation


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Introduction

Eye tracking technologies are using in extensive area:

usability studies

color imaging (image difference)

reading studies

development of internet pages, etc.

To do this kind of studies we need the eye tracker to beprecise.

Two eye tracking camera have been disposable (Remote

eye tracking device and Head-mounted eye trackingdevice).

It was not found that the head mounted eye trackingdevice was used in printed images.


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Aim

Compare two eye tracking devices used on printed images

Head-mounted Eye Tracking Device (HED) and

Remote Eye Tracking Device (RED).

1. Is possibility to use the HED on printed images as RED?

2. How to register a data from the HED to the real world

coordinates.

3. Find out precisions in the different directions of both devices.

(precision in different places, precision in the time aspect,precision on the edges of the image, then stability of the

calibration and etc.)

4. Investigate advantages and disadvantages of both devices.


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Experimental setup - Media

Head-mounted eyetracking device (HED)

Remote eye tracking

device (RED)


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iView X System

Experimental setup - Media


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Experimental setup - Images

A B

C D

Sequence: A B A C A D


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Two parts of the experiment Experiment with the remote eye tracking device

Experiment with the head-mounted eye tracking device.

Number of observers20 observers cca 40 data sets

from all observers

Determination of a dominant eye

Instructionbefore and during the experiment

Calibration

Experiment

Questionnaire

Experiment - description


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Remote eye tracking device Recording of the eye movementdata file coordinates of the point of

regard (gaze data)

BeGaze software

Matlab program, Excel program

Head-mounted eye tracking device

Recording of the eye movementvideo (MPEG-2)

Converting of the video

Stabilization of the video

Simulink model

Findings real-world coordinates

Matlab program

Analysis


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0

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

number of cross

distance[px]

0

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8090

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

number of cross

distance[px]

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

number of cross

distance[p

x]

Distance of points from centre of

crossimage A in 1., 3., 5.

sequence

Blue = Mean

Yellow = Median

Green = Max

Red = Min

1.

3.

5.

precision in different

places

precision in the time

aspect

Experimental - results

Image A

Results for the RED:


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Point coordinates of 5 cross 19 observer

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60 80 100 120 140 160 180 200 220

x

y

points

mean

median

centre of cross

Point coordinates of 2 cross 15 observer

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80

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160

200

240

0 40 80 120 160 200 240

x

y points

median

mean

centre of cross

Ratio of points inside view angle

0

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0,5 1 1,5 2 2,5 3

view angel [degrees]

ratioofpoints[%

]

Cross1

Cross2

Cross3

Cross4

Cross5

Technical detail according to

iView X System: Gaze Position Accuracy

0.5 - 1 deg.

Image B



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MEAN MEDIAN MAX MIN

31,1962 29,0273 159,6300 0,6007

Distance of points from centre of cross

0

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1 2 3 4 5 6 7 8 9

number of cross

distance[px]

Mean

Median

MaxMin

Image C

Image B



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The head-mounted eye tracking device is not evaluated at this

time The evaluation is in-process

Problems at this time:

time-consuming

stabilization


Results for the HED:


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If real-world coordinates are fixated, I will say that HED can be more precise

at least on the same level as RED

HED allows the subject to move more freely, which I considered an important

issue.

But from the questionnaire:

Most of the observers felt more comfortable with RED, because:

HED - too big/small, observer has to wear it, does not feel freely, etc.

The rest of observer:

HED

possibility move by head, HED is part of the observer, positionwas better for look at the picture, focus and concentration was better

Discussion and results

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Continue with evaluation of the remote eye tracking device

Complete analysis and evaluation of the head-mounted eye

tracking device

Statistical evaluation of both eye tracking devices

Investigate advantages and disadvantages of both eye

tracking devices

What the next?

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THANK YOU FOR YOUR ATTENTION

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