The project offered authorities a flexible monitoring solution by combining PTZ cameras with fixed units. In critical environments with complex optical demands such as entrances, public squares and crossroads where there is significant scope for accidents, the PTZ cameras have been preferred and have allowed management to track and zoom in on targets to acquire facial and license plate data. By contrast, the fixed cameras provided video of simple traffic flow and the everyday movement of pedestrians for retrospective playback and retrieval.
HD video transmission
Confronted on the ground with the client’s demands for image clarity, Hikvision used an HD-SDI interface in preference to the regular CVBS approach, combined with optic fibre for minimal delay. Police at the central monitoring station have thus received HD video in real-time, and can exercise PTZ control from the back end with nominal time lag, the delay being less than 250 milliseconds.
Other user benefits included remote camera configuration and upgrades to image signal processing algorithms from within the central monitoring station such that there was no need for onsite adjustment. This was of value to the client since there was little disruption to the core operation of the trade fair which had immense commercial and political importance.
Time synchronisation in all the network devices has been another highlight of the Expo project, allowing police to retrieve appropriate video clips. The control centre featured a time server to which devices can be connected directly for synchronisation, while front-end products can be integrated via Network Time Protocol (NTP).
With the aim of simplifying management tasks, a centralised surveillance framework was implemented at the Shanghai project to manage all the sub systems. Using open architecture, this integrated all the analogue, fixed HD and PTZ HD surveillance products into one software platform which linked the control centre and local police stations throughout the Pudong area of Shanghai.
The CCTV project proved demonstrably successful in meeting the client’s high surveillance requirements, optimizing security for core infrastructure components such as main roads, bus stations, rail transit and public spaces throughout the exhibition area.
Centralised and distributed storage
Another challenge was data storage. Since multiple HD cameras create enormous quantities of video data, using powerful storage technology has been paramount. IP and FC storage area networks (SAN) have been used to achieve centralised network data archiving.
The application also used an NVR server in police stations for temporary caching in the event of connectivity faults between police bases and the control centre. Once the communication link is restored, video footage retained in the NVR can be uploaded retrospectively to the IP SAN automatically.
Mr Yangzhong Hu, President of Hikvision, said: "The theme of Expo 2010 Shanghai China is 'Better city, better life.' It is therefore fitting that the organisers have opted for a security product manufacturer that strives constantly for improvement."
He continued: "The experience we drew on during this project, combined with R & D capability and an innovative approach, allowed us to respond to a demanding brief. The installation demonstrated the lengths Hikvision will go to in order to consolidate its leading position in the surveillance market, providing sophisticated products that address customers’ real needs at massive infrastructure sites of this kind."