Patent Document ID: 8493449
Application ID: 13514831
Patent Status: 1

Claim One:
1. A method of estimating the perceived quality of a video sequence represented, on the one hand, at a maximum spatial resolution and a maximum temporal resolution and, on the other hand, at a lower spatial and/or temporal resolution, said method comprising: filtering said video sequence represented at the lower temporal resolution and/or the lower spatial resolution in order to produce a filtered video sequence ( 203 a , 204 b ) represented at the maximum spatial and temporal resolutions; determining a reference sequence that is equal at most to the content of said video sequence represented at the maximum spatial and temporal resolutions; and calculating a metric of perceived quality of said sequence video ( 203 , 204 ) represented at the lower temporal resolution and/or the lower spatial resolution, the calculating comprising: calculating the luminance of the reference sequence and of the filtered sequence, subtracting from the reference sequence and from the filtered sequence the respective results of the calculation of their luminance, determining, on the basis of the results of said subtractions, a measurement of the contrast of the reference sequence and of the filtered sequence, normalizing the result of said subtractions by said measurement of the contrast of the reference sequence and of the filtered sequence respectively in order to produce a measurement of the structure of the reference sequence and of the filtered sequence respectively, determining a comparison function l(x,y) comparing the luminances of the reference sequence and of the filtered sequence, determining a comparison function c(x,y) comparing the contrasts of the reference sequence and of the filtered sequence, determining a comparison function s(x,y) comparing the structures of the reference sequence and of the filtered sequence, and carrying out a combination of said comparison functions in order to produce said metric of perceived quality M(X,y)=l(X,y) α ·c(x,y) β ·s(x,y) γ , where α, β, γ are strictly positive integers.