Surveillance system
Operational Requirements of CCTV:
Benefits Of CCTV: Several other benefits, beyond a reduction in crime, may be accrued from a CCTV system, including: Reduced fear of crime, Aid to police investigations, Provision of medical assistance, Place management, Information gathering.
Need of Video Surveillance: Determine first what you want
Detection: Do you want to see a scene and know if something is happening?
Recognition: Do you want to see an event and determine exactly what is happening?
Identification: Do you want to see the individual and determine exactly who is involved?
Site survey before product selection: Location, Light condition, Weather Condition, Area to be View, Video quality, Audio recording requirement, Camera Mounting, Accessories Requirement, Power Source, Video Transmission media, Type of storage require
Understanding Light Conditions
Bright / High light Condition (HLC) / (WDR)
Full Dark Light Condition (IR or infra-Red Camera)
Dim or Low Light Condition (Low-illumination, Super low light camera)
Understand Light level - (Lux Value)
Light levels are measured in Lux. The lower the number, the less light it will take to reproduce a clear image
Typical Lux levels & Appearance
Bright Day Lux Level: 10,000-100,000
Over cast Day Lux Level: 500 to 10,000
Twilight Lux Level: 5 to 500
Night with Street Lights Lux Level:1 to 5
Moon Light No light on Streets Lux: 0.01 to 1
Dark sky at night Absolute Dark Lux 0.0001 to 0.01
Weather Conditions:
Dusty weather conditions IP66/IP67 Rating Camera
Rainy weather conditions IP66/IP67 Rating Camera
Warm Area Metal Body Camera
Area To be Viewed
3 - 5mm Lens Angle of view - 80 degree
12 - 15mm Lens Angle of view - 30 degree
22-25mm Lens Angle of view - 15 degree
85-95mm Lens Angle of view - 4 degree