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Technology / Video Quality Monitoring

Video Quality Measurement and Video Quality Evauation Technology

Video Quality Monitoring

The First-in-the-World Direct Monitoring Solution for Video Quality in the Contents Value Chain

 

Quite a number of players are involved in preparing television content before it is delivered to the homes of viewers. First, producers and content production companies supply fresh content to TV stations. In television broadcasting stations, programming of different programs are performed so that they become most attractive for viewers, then they are broadcasted directly or supplied to Network Operators. Network Operators include different communication companies, such as satellite delivery companies, cable TV, and IPTV services. These players supply a huge number of TV programs of hundreds of channels and send the content to viewers, much like how a store in a shopping mall displays its products to customers. This is called the Contents Value Chain and is extremely important to maintain video and audio quality at a satisfactory level for viewers. However, in the course of processing, encoding, transcoding, transmission, filing, etc., quality degradation, such as audio noise, block noise, lip sync error, etc., which are very unpleasant for viewers, may occur and in worst cases may result in cancellation of the contract with the viewer. Therefore, it is very important for each player to accurately grasp in real time the quality of the picture and sound they have provided. However, in many cases nowadays they rely on indirect methods of data measurement, such as TS Checker, IP packet loss measurement, as well as File check and others. Quality degradation is frequently overlooked, or the quality is satisfactory but false alarms are activated, so it cannot be said that it is a sufficient solution.

K-WILL proposes a solution that can monitor in such a way that the quality of picture and audio can be directly supervised via human eyes and ears. SDI input type QuMax (Quality Matrix) plays an active part in the high end process of the Contents Value Chain. Up to 12 cards can be inserted in a 4RU size. There are three types of cards and they are as follows:

Probe300S : No Reference
It can detect deterioration in quality of picture and audio without using a reference video signal. It can detect block noise and line noise even if there are only a few instances in one field. The Probe300S is an unique QC solution for the play back check of the file image mainly in an environment where a reference image does not exist (i.e., play back of VCR and images on a server).

Probe300D : Full Reference
The reference signal and the signal to be evaluated are accurately synchronized and extremely accurate quality measurement is performed by comparing pixel base. It is ideal for comparing the quality before and after the process of encoding and transcoding. The ITU J.144 standard and EMMY awarded technology, which accurately measures the Compression Errors during encoding and at the same time also detects errors of even one pixel, has been adopted.

Probe200/Probe210 : Reduced Reference
It measures by comparing the difference between the quality of content in physically remote locations and is perfect for the detection of lip sync measurement, video dropped frames / audio noise, video lip-sync measurement, etc. As for configuration, Probe200 extracts the amount of video and audio features (Video DNA) from the SDI input, and Probe210 extracts the amount of video and audio features (Video DNA) from the analog Component input. The two are brought together in one place via the Internet and a real-time comparison is carried out by the comparison software on the server. Since the amount of information of Video DNA is comparatively small - 256 kbps or less - up to 30 comparisons can be carried out on a single server without overloading the IP network.

NP2000 : No Reference
NP2000 is suitable for checking the quality of the consumer end of the Value Chain, i.e. video and audio output from the STB in the viewer's home. The connection with the STB is very simple. Simply connect the composite video signal output of STB and L/R audio output cables (a total of three output analog cables) to NP2000. With one NP2000 of 1RU size, you can use up to eight STBs and can check the quality of TV programs of eight different channels at the same time. These TV programs are premised on being HDTV, which is supposed to be of high quality, and since quality degradation, such as unpleasant block noise and audio popping noise mixed in HDTV certainly exist in the composite video signal and L/R voice signal, it is possible to reliably detect the deterioration. It is intended for analog signal and, compared to the monitoring of SDI, it is space-saving and low cost. Using the DVI cable, NP2000 can display all 8 channels on a multi-screen with video and audio level bars. When an alarm is triggered, the corresponding channel will also be displayed the alarm message on the multiscreen at the same time. NP2000 can also output the alarm message in SNMP traps.

Additionally, QuMax (Probe300S, Probe300D, Probe200, Probe210) and NP2000 are equipped with a special GUI and a special Logging Server, respectively. Moreover, since control commands and the outgoing messages are open, it is possible to easily incorporate both systems into a large scale system.

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