VDG Sense is integrated in the tunnel control system through the HTTP API. The system is programmed to operate completely autonomous (without an operator in control). When an issue occurs, the system automatically sends the required image to the control room video wall, located 20 kilometers away. There, the operator can then visually verify the signal that he has received from the tunnel control system. The video security installation is specifically used to verify, and not to detect. Detection is integrated through the tunnel control system.
“VDG is capable of delivering very specific solutions for video security management. Their reliability and scalability is unique and therefore places them ahead of their competition.”Werner Hulst — Managing Director of Isolectra B.V.
What makes the tunnel a complex set-up, is that redundancy is essential. The operator must be able to trust on the visual verifications at all time. When the video system would hesitate or stop working all together, the safety of passing traffic can not be guaranteed and the tunnel is shut down. A shutdown is not only very costly, but also causes major infrastructure problems for traffic who depend on the tunnel.
To ensure a continuous videostream, an extensive redundant solution is provided. This means that in case of a failure in one of the servers, the other servers automatically and instantly take over the tasks of that server, making sure there is never a loss of video data.
Developed specifically for this case, Video Tagging is an important feature for operators to save video data. In a standard VDG Sense set-up, new video data is written over old video data when the storage is full. In case of an event, the operator can manually tag video data within a specific time frame, making sure that video data is never deleted or overwritten. This can be done up to one hour before the event occurs, showing any possible causes that could have lead to the event captured on screen. Video Tagging is used to make sure that video data can be retrieved in a later stadium for research or investigation purposes.
The system also automatically detects when storage contains too much tagged video data. In that case, the operator can choose to delete video data that has already been used, or to export the files to an external storage, such as a USB drive or external hard-drive.
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