Comparison between ACR and SAMVIQ Kyoto VQEG meeting March 2008
P. Le Callet, R. Pépion, S. Péchard
ACR vs SAMVIQ ACR
SAMVIQ
Category rating
continuous scale (label, numbers+ graphical)
No explicit reference
Explicit reference + hidden
PVS is viewed only once (80 PVS per 30 min.) Randomisation per session
PVS can be replayed on request (around 40 PVS per 30 min.) Randomisation per content
Subjective QA Experiments at different resolution
* * From Matthew D. Brotherton, Quan Huynh-Thu, David S.Hands, and Kjell Brunnström, “Subjective multimedia quality assessment,” IEICE Trans. Fundam. Electron. Commun. Comput. Sci., vol. E89-A, no. 11, pp. 2920–2932, 2006.
Correlation coefficients between ACR and SAMVIQ QVGA
0.969
CIF
0.94
VGA
0.942
HD
0.899
HD set
Scales adjustment ACR => between 1 and 5 SAMVIQ => between 0 and 100
Philip Corriveau, Christina Gojmerac, Bronwen Hughes, and Lew Stelmach, “All subjective scales are not created equal: the effects of context on different scales,” Signal Processing, vol. 77, no. 1, pp. 1–9, 1999.
Confidence intervals and the number of observers from SAMVIQ
mode 1 : without rejection mode 2 : with ACR rejection mode 3: with SAMVIQ rejection
from ACR
Confidence intervals in function of the number of observers # observers
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