closed circuit television
Post on 31-Dec-2015
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CLOSED CIRCUIT TELEVISION
PRACTICAL CONSIDERATIONS FOR SYSTEM IMPLEMENTATION
PHILLIP BOYD
SYSTEM DEFINITION AND IMPLEMENTATION OVERVIEW
• Business Requirement• Risk Assessment• Operational Concept• Requirements Analysis• Functional• Technical • Support• Budget: what resources are available?• Through Life Support: specialist skills, recurrent costs• Constraints: legal, technical, perception, commercial
SYSTEM DESIGN PHILOSOPHY
• CCTV is one part of the solution, and not a panacea for public safety and security
• Improve public perception of safety• Deter and displace anti-social behaviour & crime • Provide usable, high quality evidence• Integrated with the environment• Consider user/corporate/statutory requirements• Understand constraints, mitigate or design out• Ensure support is straightforward
TYPICAL CONFIGURATION
CAMERA SELECTION
• Select camera/housing based upon:– Areas requiring coverage, level of detail and
resolution– Distance from camera to target area, and streetscape– Environmental conditions (e.g. hot/humid; cold/icy)– Vandalism risk – appraise threat, choose solution – Whether operational use by police or council required– Planned system life, durability and upgradability
NETWORK SELECTION
• Select CCTV network based upon:– Need for centralised monitoring/recording or
stand-alone cameras– Existing network infrastructure (optical
fibre/copper/wireless)– Ownership of assets (lighting poles, power poles)– Distance between cameras and recording/
monitoring site– Potential system growth or reorientation
SYSTEM POWER
• Powering can be problematic– Civil/Electrical works and pole leasing costs– Trenching/traffic management/MoUs/RoW– Is mains readily available? Is solar an option?– Low power CCTV systems, standby modes,
movement activated in remote locations/depots
VIDEO STORAGE
• Video archiving is vital – Evidence preservation– Local to camera or centrally – Recording period and video quality – Protocols for access and release
ENVIRONMENTAL FACTORS
• Trees, sculptures, temporary structures will affect coverage – landscaping is an important factor
• Light doesn’t bend – much – so the camera must be able to view the target
• High variance in illumination (light/shade) is not desirable (lighting uniformity defined in AS)
• Architectural aesthetics may not favour even discreet CCTV positioning
• Consider the effect of new or altered buildings
RUNNING THE SYSTEM
• Maintenance strategy to suit environment (inspection, cleaning, servicing if required)
• Range of fault detection options (tamper, lens obscuration, incorrect camera position)
• Consider bundled maintenance agreement with well defined performance criteria
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