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Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces Gabriel Dauphin, Patrick Patrick Viaris de Lesegno L2TI, Institut Galilée, Université Paris 13 EUVIP 2010

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Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces. EUVIP 2010. Gabriel Dauphin, Patrick Viaris de Lesegno L2TI, Institut Galilée, Université Paris 13. Outline. Three quality metrics are studied : PSNR, VDP, SSIM. Analytic. Experience. IV. - PowerPoint PPT Presentation

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Page 1: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

Analysis and Comparison of Quality Metrics with Reference

Based on Uniform Color Spaces

Gabriel Dauphin,

PatrickPatrick Viaris de Lesegno

L2TI, Institut Galilée,

Université Paris 13

EUVIP 2010

Page 2: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

Outline• Three quality metrics are studied :

PSNR, VDP, SSIM

1.Are they consistent with Weber’s law?

2.Is Weber’s law consistent with HVS?

Analytic Experience

I V

II III

IV

Page 3: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

• .

• VDP

• SSIM

Consistent with Weber’s Law?

Mean

MeanMaxM L

LLC

I

DK

Dkl

RK

Rkl

kl B

B

B

BC

M

jDj

Rj

RDj

Dj

Rj

Dj

Rj

M 12222

221

Page 4: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

Color Spaces and Gamma Correction Say NO• CIE L*a*b* 1976 :

• Gamma Correction

L

L

L

LLLE

L

L

f

3

11160

31

Re

31

*1

*2

II

31

31

Re

1

116

322

LL

L

LCE fW

MaxMax g

gLL

1

1 1,0

Lg

gL

L

LCgg

L

L

Max

ThMaxWTh

Page 5: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

Psychovisual Tests Say NO

31

31

BW

BW

LS

LC

III

29

65

147

31

1025.229

65

65

147

[Y.-K. Lai and C.-C.J. Kuo 2000]

Page 6: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

New Photometric Invariance Law

1'

',, mnmnmnmnmnmn LLLQLLLQ

33.0

IV

Q consistent with HVS wrt its sensitivity to backgound Lum.Q consistent with Weber’s law0

Page 7: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

Numerical SimulationsV

PSNR:=0.42

VDP:=-0.04

SSIM:]42.0,0[

0iC

0

SSIM

PSNR => YesVDP, SSIM => No 0iC

Page 8: Analysis and Comparison of Quality Metrics with Reference Based on Uniform Color Spaces

Conclusion

• Weber’s law => VDP,SSIM[Ci=0] HVS• Photometric invariance law and simulation tool • Yet Weber’s contrast may improve rendering => this should be application driven• Many aspects of image processing are already

consistent with HVS => good news for quality assessment


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