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trying to model each individual distortion. Further, if one does choose to model each
distortion individually, a method to study the effect of multiple distortions must be
undertaken. Again, this is a combinatorially challenging problem.
A majority of algorithms seek to model spatial-distortions alone and even though
some methods include elementary temporal features, a wholesome approach to NR
VQA should involve a spatio-temporal distortion model. Further, in most cases a
majority of the design decisions are far removed from human vision processing. It
is imperative as researchers that we keep in mind that the ultimate receiver is the
human and hence understanding and incorporating HVS properties in an algorithm
is of essence. Finally, even though we listed statistical measures to evaluate per-
formance, researchers are working on alternative methods to quantify performance
[81, 82, 83].
References
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