Patent ID: 7843850

Claim:
A method of assessing quality of a video signal comprising a sequence of video frames received via a packet switched network, the method comprising the steps of: receiving a received sequence of packets via said packet switched network; extracting a set of parameters from said received sequence of packets; generating an estimated mean opinion score in dependence upon said set of parameters; and storing the estimated mean opinion score on a computer-readable medium accessible by a user for visualization and analysis; wherein the extracting step comprises the sub steps of: setting a first counter to zero; setting a second counter to zero; grouping packets of said received sequence of packets into groups of packets, each group corresponding to a transmitted video frame; determining identified lost packets determining whether each group has received all packets comprising the corresponding transmitted video frame in dependence upon said identified lost packets; for each group where it is determined that packets have not been received, performing the sub-steps of: determining a frame size estimate of the number of packets in a corresponding transmitted video frame; incrementing the first counter in dependence upon said frame size estimate; determining a subsequent packet estimate of the number of packets after a first lost packet in said corresponding transmitted video frame; incrementing the second counter in dependence upon said subsequent packet estimate; and determining a parameter in dependence upon a weighted sum of said first counter and said second counter.