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Video 2D Test Solution

Video 2D Test Solution

Video measurement over Ethernet VoIP channels, Analog Line, S-Video, or with a camera adaptor.


In today’s ever more complex communications and media networks it is more and more the end-to-end quality which matters most and which deserves more and more emphasis. QoE Systems has focused on the ease of deploying objective perceptual measurements for hybrid networks of many kinds using easy to use test and monitoring solutions. Its line of Q-Master laboratory instruments is easy to deploy and very user friendly, such that comprehensive quality of service matters can quickly and accurately be measured and analyzed without a long and arduous process or long learning curve.

Video Quality

Video services consist of moving pictures and sound. Therefore, video picture quality and audio quality can be assessed separately. Awareness of consumers judging the quality of the service as a whole, however, is critical, as it subjectively influences test scores. A television audience will perceive quality as a blend of audio, video and their synchronization, and will base a quality score on a combination of all three factors.

In addition, mobile devices and PC based video applications are very different to television altogether. The screen size and quality alone can have a significant impact on the quality of received video, which impacts subjective scores also.

Currently, there are two ways of measuring video quality. There are subjective and objective methods. Subjective tests require subjects (e.g. human viewers) to view video clips and give them a quality score. Traditionally subjective data are the benchmark for quality perception. However, subjective testing is not a practical solution for live applications, e.g. interrupting the service to find out what users think is not a practical solution, neither is it practical to do subjective tests in a lab environment during development of a product.

The solution is an objective test method where the video signal is analyzed and a prediction made similar to a subjective opinion. For this reason, the ITU-T ratified recommendation J.144, an objective perceptual video quality measurement algorithm, VMOS, for use in the broadcast market.

Numerous subjective tests where performed and the results were utilized to create a model of human perception of quality. This model uses an algorithm which provides an objective measure of video quality. As with voice services, objective models of video quality use the Mean Opinion Score (MOS) scale.

Q-Master System. The best Video test solution.

QoE Systems ’ Q-Master System (Video version) measurers the video and audio quality aspects of video streaming and video telephony communication devices or channels. Q-Master uses perceptual analysis capabilities as defined by ITU-T. The result of the measurement is a VMOS (Video Mean Opinion Score); to interpret end-to-end quality of video. The output includes information such as block distortion, blurring, edge busyness, jerkiness, PSNR and noise. The related audio quality and video/audio synchronization is also analyzed. Audio quality assessment provides a standard MOS score, while the important lip synchronization correlates timing identical as in human perception.

The Q-Master system facilitates the sending and receiving of video streams either from its internal Darwin Server, or any streaming server on the network. This allows developers and operators to assess the correct functioning of networks and/or devices such as codecs, transcoders, gateways, etc.

The Q-Master System includes dedicated hardware with a variety of available network and device interfaces. It facilitates the sending and receiving of signals over Ethernet VoIP channels, Analog Line, S-Video, or with a camera adaptor.

The Q-Master GUI operates in a Windows environment, where the user interface provides a simple yet full featured test process environment that allows quick and comprehensive quality assessment measurements. The measurement results can be stored, reviewed, printed and exported.

The Q-Master can be deployed both locally as well as remotely connecting with Ethernet/LAN for control.

• Measure quality with perceptual algorithm

• Easy-to-use, Windows-based user interface

• Graphical presentation of all measurements

• Internal video server available

• Unique camera interface

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