<s>
Perceptual	B-Application
Evaluation	I-Application
of	I-Application
Video	I-Application
Quality	I-Application
(	O
PEVQ	B-Application
)	O
is	O
an	O
end-to-end	O
(	O
E2E	O
)	O
measurement	O
algorithm	O
to	O
score	O
the	O
picture	B-Device
quality	I-Device
of	I-Device
a	I-Device
video	I-Device
presentation	I-Device
by	O
means	O
of	O
a	O
5-point	O
mean	O
opinion	O
score	O
(	O
MOS	O
)	O
.	O
</s>
<s>
It	O
is	O
,	O
therefore	O
,	O
a	O
video	B-Device
quality	I-Device
model	O
.	O
</s>
<s>
PEVQ	B-Application
was	O
benchmarked	O
by	O
the	O
Video	B-Device
Quality	I-Device
Experts	O
Group	O
(	O
VQEG	O
)	O
in	O
the	O
course	O
of	O
the	O
Multimedia	O
Test	O
Phase	O
2007	O
–	O
2008	O
.	O
</s>
<s>
Based	O
on	O
the	O
performance	O
results	O
,	O
in	O
which	O
the	O
accuracy	O
of	O
PEVQ	B-Application
was	O
tested	O
against	O
ratings	B-Device
obtained	I-Device
by	I-Device
human	I-Device
viewers	I-Device
,	O
PEVQ	B-Application
became	O
part	O
of	O
the	O
new	O
International	O
Standard	O
.	O
</s>
<s>
Application	O
scenarios	O
address	O
next	B-Protocol
generation	I-Protocol
networking	I-Protocol
and	O
mobile	O
services	O
and	O
include	O
IPTV	O
(	O
Standard-definition	B-Device
television	I-Device
and	O
HDTV	B-Device
)	O
,	O
streaming	B-Application
video	I-Application
,	O
Mobile	B-Application
TV	I-Application
,	O
video	B-Application
telephony	I-Application
,	O
video	B-Application
conferencing	I-Application
and	O
video	O
messaging	O
.	O
</s>
<s>
PEVQ	B-Application
is	O
full-reference	O
algorithm	O
(	O
see	O
the	O
classification	O
of	O
models	O
in	O
video	B-Device
quality	I-Device
)	O
and	O
analyzes	O
the	O
picture	O
pixel-by-pixel	O
after	O
a	O
temporal	O
alignment	O
(	O
also	O
referred	O
to	O
as	O
'	O
temporal	O
registration	O
 '	O
)	O
of	O
corresponding	O
frames	O
of	O
reference	O
and	O
test	O
signal	O
.	O
</s>
<s>
PEVQ	B-Application
MOS	O
results	O
range	O
from	O
1	O
(	O
bad	O
)	O
to	O
5	O
(	O
excellent	O
)	O
and	O
indicate	O
the	O
perceived	O
quality	O
of	O
the	O
decoded	O
sequence	O
.	O
</s>
<s>
PEVQ	B-Application
is	O
based	O
on	O
modeling	O
the	O
behavior	O
of	O
the	O
human	O
visual	O
system	O
.	O
</s>
<s>
In	O
addition	O
to	O
an	O
overall	O
MOS	O
score	O
,	O
PEVQ	B-Application
quantifies	O
abnormalities	O
in	O
the	O
video	O
signal	O
by	O
a	O
variety	O
of	O
KPIs	O
,	O
including	O
PSNR	O
,	O
distortion	O
indicators	O
and	O
lip-sync	O
delay	O
.	O
</s>
