System and method for measuring video quality degradation using face detection
System and method to detect video quality degradation in a video stream received by a telecommunications endpoint, the method including: locating reference features characteristic of content in the received video stream; calculating reduced reference features from the located reference features; receiving reduced reference features of a transmitted video stream, the transmitted video stream corresponding to the received video stream; calculating a distance between the reduced reference features in the received video stream and the reduced reference features of the transmitted video stream; and detecting video quality degradation when the calculated distance exceeds a predetermined threshold.
1. A method to detect video quality degradation in a video stream received by a telecommunications endpoint, the method comprising:
locating reference features characteristic of content in the received video stream;
calculating, by use of a processor, reduced reference features from the located reference features;
receiving reduced reference features of a transmitted video stream, the transmitted video stream corresponding to the received video stream;
calculating, by use of a processor, a coordinate distance between the reduced reference features in the received video stream and the reduced reference features of the transmitted video stream; and
detecting video quality degradation when the calculated coordinate distance exceeds a predetermined threshold.
2. The method of claim 1 , wherein reference features characteristic of content comprise faces.
3. The method of claim 1 , wherein reduced reference features comprise locations of the reference features.
4. The method of claim 1 , wherein the reduced reference feature comprises a location of a rectangular area surrounding the reference feature.
5. The method of claim 1 , wherein the reduced reference features are calculated at less than a full frame rate of the received video stream.
6. The method of claim 1 , wherein the reduced reference features are calculated at no more than two frames per second.
7. The method of claim 1 , wherein the reduced reference features of the transmitted video stream are received via a communication channel that is separate from a communication channel used to transport the video stream.
8. The method of claim 1 , further comprising:
receiving a frame of the transmitted video stream to the telecommunications endpoint, once per second, via a reliable channel; and
calculating reduced reference features from the transported frame.
9. The method of claim 1 , wherein calculating a coordinate distance comprises calculating the coordinate distance in accordance with the following relationship:
distance
=
log
(
(
x
s
-
x
r
)
2
+
(
y
s
-
y
r
)
2
)
log
(
d
max
)
,
wherein:
(x r , y r ) comprises received coordinates of a reduced reference features in the received video stream;
(x s , y s ) comprises received coordinates of a reduced reference features in the transmitted video stream; and
d max comprises a diagonal resolution size.
10. The method of claim 1 , wherein the video stream originates from a remotely-located camera accessible via a communication path.
11. The method of claim 1 , further comprising: detecting an absence of reference feature from the received video stream.
12. A system to detect video quality degradation in a video stream received by a telecommunications endpoint, the method comprising:
a location module configured to locate reference features characteristic of content in the received video stream;
a processor configured to calculate reduced reference features from the located reference features;
a receiver configured to receive reduced reference features of a transmitted video stream, the transmitted video stream corresponding to the received video stream;
a processor configured to calculate a coordinate distance between the reduced reference features in the received video stream and the reduced reference features of the transmitted video stream; and
a detector configured to detect video quality degradation when the calculated coordinate distance exceeds a predetermined threshold.
13. The system of claim 12 , wherein reference features characteristic of content comprise faces.
14. The system of claim 12 , wherein the reduced reference feature comprises a location of a rectangular area surrounding the reference feature.
15. The system of claim 12 , wherein the reduced reference features are calculated at less than a full frame rate of the received video stream.
16. The system of claim 12 , wherein the reduced reference features are calculated at no more than two frames per second.
17. The system of claim 12 , wherein the reduced reference features of the transmitted video stream are received via a communication channel that is separate from a communication channel used to transport the video stream.
18. The system of claim 12 , wherein the processor is configured to calculate a coordinate distance in accordance with the following relationship:
distance
=
log
(
(
x
s
-
x
r
)
2
+
(
y
s
-
y
r
)
2
)
log
(
d
max
)
,
wherein:
(x r , y r ) comprises received coordinates of a reduced reference features in the received video stream;
(x s , y s ) comprises received coordinates of a reduced reference features in the transmitted video stream; and
d max comprises a diagonal resolution size.
19. The system of claim 12 , wherein the video stream originates from a remotely-located camera accessible via a communication path.
20. The system of claim 12 , further comprising: a detection module configured to detect an absence of reference feature from the received video stream.