Вокорд. Системы видеонаблюдения, распознавания лиц, фотофиксации нарушений ПДД, аудиорегистрации


Correcting distortions on fish-eye lenses
The use of fisheye lenses can expand the control zone of one camera several-fold, which allows to reduce the number of cameras on the site significantly. However, the distortions, produced by fisheye lenses, affect the perception of the video and make it difficult to work with the video The VOCORD Tahion system serves to eliminate distortions with the help of specialized program algorithms and makes the video more suitable to be perceived by the human eye. The license for this function is purchased separately.
Support of dual streaming from 1 camera

VOCORD Tahion can simultaneously process several video streams from one camera. For example, one of the streams can be recorded into the archive, another can be displayed on the operator’s screen. But processing several video streams from one camera requires high network capacity.

When a large number of channels is to be displayed, each channel will be displayed for view in a small window where the details cannot be seen. Tahion solves this problem by supporting several formats of streaming video from the camera in the live video regime. If a large number of channels are displayed, Tahion automatically retrieves from the camera a low resolution video stream; when the channel is maximized, it automatically switches to high resolution not to lose the details.

Video stream processing - Tahion.10GIGe technology
Receiving a large video stream is a resource-intensive process for the operating system. A considerable part of the CPU resources is spent on pasting fragments of the data obtained. The Tahion.10GIGe technology, developed by the Vocord company, processes video streams right in the core of the operating system, considerably accelerating the processing of packages and reducing the load on the central processing unit. Owing to Tahion.10GIGe the CPU resources are economized by 300 percent, when a large amount of network data is worked with.
Decoding of video streams
VOCORD Tahion supports one of the most effective technologies for decoding video streams - Intel QuickSync. It allows to decode up to 80 video channels (FullHD, h.264) when the CPU load is low. It reduces requirements for hardware of the surveillance system and boosts its productivity. Unlike decoding solutions on graphics cards, the technology of Intel QuickSync ensures predictable quality of decoding on all supported CPUs.
Image enhancement

To improve the quality of video VOCORD Tahion uses several visual filters:

> Contrast increase. This filter will help to obtain an image of proper quality, even if the video was recorded in poor lighting, for example, on the dark parking site.

> Deinterlacing. To avoid the “comb effect”, occurring when the interlaced video is streamed, VOCORD Tahion uses filters of deinterlacing, which considerably enhance the quality of images, obtained from analogue cameras. The high quality is ensured by means of the unique technology of field combination, developed in the Vocord company.

Smart fast forward of video

When video fast forward is switched on, the load on hard drives in the video surveillance systems is increased, which might lead to the overload of the equipment. The human eye is not able to follow the number of shots per second displayed in the fast forward regime. VOCORD Tahion automatically “thins out” the video stream, balancing between the possibilities of the human eye, the productivity of the system of storing data and the network, and the tasks of the surveillance system.

Domain hierarchy of the video surveillance system

In large-scale projects, especially in “Safe city” projects, different parts of the video surveillance system may be administered by various organizations. It implies that every organization can have access only to its part of the system, while the parent organization will have access to all the parts of the system. In such cases the architecture of the video surveillance system can be built on the basis of domain hierarchy.

Every domain is a fully functional system, which can work autonomously, without being connected with the outer world. Several domains can be united into an integral system, whose domains may have hierarchical relationship. The users of higher level domains receive access to low level domains. Low level domains do not have to know about the existence of the higher domains. If connection between the domains fails, each of them will continue working independently; when connection is restored, the system will automatically restore hierarchy.

Routing of video streams Tahion NetScale

In most video surveillance systems connection is established directly: a video stream is simultaneously requested by many operators, recorded into the archive, transmitted to the video wall, etc. This results into a heavy load in one communication channel, which can lead to data loss or affect the quality of video shots when transmitting the video stream. The system VOCORD Tahion has a stream router - program component Tahion NetScale. It establishes one connection with the video channel and distributes data on every request.

Tahion NetScale was conceived as a route of the application layer for transmitting video data: it does not only transmit data, but also analyzes their structure. In any video surveillance system, when data are transmitted, every shot is split in IP-packages. When protocols with non-guaranteed delivery (UDP, RTP) are used, part of the packages can be lost, when, for example, the load on IP-network increases locally. As a result, the user receives low quality shots (with “artefacts”). Such video recordings cannot be used, for example, as evidence in court.

Unlike ordinary routers, Tahion NetScale “understands” which IP-packages make up one shot. If the network load is heavy, it will let pass those packages that make up one shot. Thus, the video stream will be with a lower frequency of shots, but all shots in it will remain unbroken – the image will have no “artefacts”.

The maximum amount of data that Tahion NetScale can process is limited by hardware possibilities of the server only.

Work with the archive

Cloud architecture of storing data VOCORD Tahion allows to use an unlimited number of remote physical archives, virtually uniting them into a unified system of storing data. Uniting occurs unnoticed by users – they work will all archives as if it was one large archive, without having to connect to different servers in order to see different recordings. This architecture allows to save on video surveillance systems, as it is not necessary to buy expensive professional data storing systems.

Flexible configuration of recording

VOCORD Tahion allows to flexibly configure recording into the archive: different video channels can be recorded into different archives with a different frequency of shots and stored for a different period of time. For example, for many sites it is relevant to record a long-term archive with low fps, but if detectors are triggered, to record into the alarm archive with an increased fps. Working with the archive, the system will automatically switch to recording with a higher fps. It allows to optimize volumes of stored information and reduce expenses on hard drives, which often make up for the largest part of the budget allocated for the entire video surveillance complex.

Metafile system Tahion IntelliStore

Usually video recording systems store metadata either inside files with video data or near these files. But for the system the scenarios of working with video data are considerably different from those of working with metadata. While in the first case it is necessary to process large volumes of stream video, in the second case a small amount of server-based data is dealt with. To accelerate the work of the video recording subsystem VOCORD Tahion the unique technology IntelliStore is used – it employs its own metafile system over the standard NTFS. This technology allows to record meta data on a separate disc and read this type data separately from video data, which considerably accelerates work with the video in the archive. Besides, it ensures zero fragmentation of discs, even if re-recorded multiple times.

Video synchronization

Working with a large number of channels in the archive in some video surveillance systems leads to difficulties because of desynchronization of video streams between different channels. In this case the operator will have difficulty reconstructing the actual course of events. The technologies realized in the VOCORD Tahion guarantee synchronous video playback for all the cameras: regardless of their number, in any video format, at any moment of time and for any playback time in any direction.

Cluster load balancing
The use of clusters increases the reliability of the video surveillance system, but will require the acquisition of additional equipment. The unique technology Tahion NetBalance allows to ensure the fault tolerance of the system without having to install backup servers. With the help of this algorithm the servers dynamically balance load among themselves. In case of failure on one server the system will automatically redistribute the load onto functional servers, unnoticeably for users and without data loss.
Fault tolerance is the necessary element of any safety system. Failover clustering, realized in VOCORD Tahion, allows to automatically launch backup server, which will assume all the load, in case of failure of any component of the system. The special feature of the clusters built in the system is absence of single points of failure and guarantee of safety of video data when switching between the main and backup servers. The switch between the main and backup servers occurs unnoticed by users and does not affect their work.
High productivity
High productivity is a distinctive feature of the system built on the basis of VOCORD Tahion. Capacity for the incoming video stream is 3 Gb/s, productivity of the archive for recording – 10 Gb/s; client application ensures simultaneous display of up to 80 video channels with FullHD definition with the frequency of 25 shots per second.
Scalable architecture
VOCORD Tahion architecture is initially devised to be used in large scalable projects. It is modular: the various functions – of transmitting video from cameras to servers, archiving, user rights management – are distributed among different program modules, which operate independently and can be installed on different servers. It guarantees unlimited scalability of the system while continuing the operation and additional failure protection. Narrow channels of connection with remote servers do not affect the system as a whole.