COLOR MEMORY MATCH UNDER DISPARATE VIEWING CONDITION

SUPERVISING BY:

Jon Y. HardebergPeter NussbaumMarie Kaplanová

Ondrej Panák

The Norwegian Color Research Laboratory

Faculty of Computer Science and Media Technology

Gjøvik University CollegeGjøvik, Norway

http://www.colorlab.no

Department of Graphic Artsand Photophysics

Faculty of ChemicalTechnology

University of PardubicePardubice, Czech republic

http://www.upce.cz

Master Thesis Presentation8.7.2007, Gjøvik

CONTENT

♦ Introduction

- Color memory

- Color appearance

♦ Aim

♦ Experiment

♦ Results

♦ Conclusion

COLOR MEMORY

♦ Color memory shift♦ Cognitive colors♦ Color memory experiments

- Abstract cue- Memory cue

♦ Methods- Selecting- Mixing up- Deciding

COLOR APPEARANCE

♦ Color appearance phenomena

♦ Color appearance models – CIECAM02

♦ Corresponding color data sets

AIM

♦ Color memory match under simply specified condition (varied in surround and background parameters only)

♦ How big are the differences between mixing memory color in different condition, and can be used CIECAM02 for evaluation modeled experiment?

♦ Is memory shift really not related to the conditions of memorizing (the same conditions of mixing)?

VARIABLES

♦ Colors♦ Given cue♦ Time to show♦ Delay time to match♦ Shape♦ Angular subtense♦ Number of observers♦ Adaptation time♦ Background♦ Surround ♦ Illuminant

EXPERIMENT

EXPERIMENT 1 EXPERIMENT 2

EXPERIMENT 1

EXPERIMENT 1

EXPERIMENT 2

EXPERIMENT 2

RESULTS E-1

Dim mixing in CIELAB

ab plane aL plane

RESULTS E-1

Mean coordinatesof different mixing in CIELAB

TransformedNontransformed

Lighntess

Chro./colorful.

Hue angle

LAB CAM

Lighntess

Chroma

Hue angle

Light DarkNontransformed vs transformedLab

RESULTS E-1

Mean values of mixing CIECAM

E-1 memory match E-2 simultaneous match

RESULTS E-2

backround skin green blue red yellow

gray14,5

3 13,9116,5

3 8,95 12,29

black13,3

9 13,4516,3

6 12,66 10,76

white11,8

5 12,9115,9

5 10,36 11,95

dE LABbackround skin green blue red yellow

gray17,7

7 19,7333,3

315,9

4 22,45

black16,0

2 20,0830,4

520,2

4 19,81

white14,7

3 19,2631,5

017,2

6 20,23

dE CAM

dLightness

dCroma

dHue

backround skin green blue red yellow

gray-

13,73 -2,31 -5,08 0,44 -3,80

black-

13,32 4,03 -3,64 6,19 -0,56

white-

10,51 6,44 -1,32 6,02 0,65

backround skin green blue red yellow

gray 4,73 -3,42 20,41 4,25 -5,38

black 1,05 -2,37 16,00 1,36 -5,44

white 4,21 3,60 18,10 6,09 -1,90

backround skin green blue red yellow

gray -3,81 8,50 22,06 1,23 -2,79

black 0,69 9,84 12,23 -1,19 5,27

white -5,59 9,55 11,22 1,12 3,60

Correlation factors for Lab

  L C h

dL -0,5994 0,7445 0,1052

dC -0,2302 -0,701 0,6288

dh -0,3523 -0,3592 0,9284

Correlation factors for CAM

  J M h

dJ-

0,5894 0,98910,050

8

dM-

0,0717-

0,51060,331

4

dh-

0,5556 0,11180,842

6

CONCLUSION

♦ CIECAM02 has weightily problem with predicting especially the chroma attribute of the color seen with the black background

♦ There is no statistical proof that the background has some influence on color memory shift. There is only slight tendency to memorize the colors as lighter, when they are shown on white background

♦ The lightness shift seems to be correlated to the chroma of original color

FURTHER WORK

♦ More accurate technique of mixing

♦ The variation of the condition with light sources variations as well

♦ Color memory of color pairs

THANK YOU FOR YOUR

ATTENTION