Vivotek NR7401 Manual de usuario descargar pdf (Pagina 21)

Chap.2 Lens and Image Sensor Technology

ICR

An ICR (IR-cut Filter Removable) is a mechanical shutter design. It is placed between the lens and the image

sensor and is controlled by a motor or an electromagnet (Figure 2.16).

Figure 2.16 Placement of ICR

When the ICR is switched on, it will block infrared light and allow only visible light to pass through. When the ICR is

switched off, infrared light will be allowed and images will turn into black-and-white mode, which is more sensitive

to infrared light (Figure 2.17).

Visible Light

Day

Night

Wave Length (nm)

Light Transmission

Ultraviolet

invisible invisible

Infrared

770380

380100

100

770 1000

1000

Wave Length (nm)

380100

770 1000

Figure 2.17 Operation of ICR in daytime and nighttime

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 73 74

Planet VIVOTEK 2
Table of Contents 3
IP Surveillance Overview 6
LAN/Internet 7
1.2.2 Camera Types 8
1.3 Video Servers 9
1.4 Network Video Recorders 10
Advantages of IP Surveillance 11
Focal Length 12
Focal Point/ 12
Image Sensor 12
Forward Principal Point 12
Backward Principal Point 12
Tele/Wide 13
Fixed lens Vari-focal lens 13
2.1.3 Lens Mount Types 14
2.2 Image Sensor 16
1280x1024 17
1920x1080 17
2.2.3 Sensor Scan Modes 18
2.2.4 Wide Dynamic Range 19
2.3.2 View Angle 20
2.3.3 Day and Night 20
Light Transmission 21
Non-IR Corrected Lens 22
Visible Light 22
Infrared 22
IR Corrected Lens 22
Visible Light & Infrared 22
Video and Audio Compression 24
Compression 25
Transmission 25
CompressionFind Difference 25
Reference 25
3.1.3 H.264 26
3.2 Audio Compression 27
3.3.1 Multiple Streams 28
3.3.2 Two-way Audio 28
Full duplex 29
Half duplex 29
IP Network 30
4.3 IP Address 31
4.4 Network Protocols 32
Internet 33
4.4.2 Transmission Protocols 35
● Data Transmission 35
● Media Transmission 35
4.4.4EventNotication 36
4.4.5 Timing Correction 36
4.5 Wireless Networks 37
Network Camera 38
Network Device 39
Intercepted PC 39
Destination PC 39
4.7 PoE 40
Retail Store 41
5.1 Housing 42
5.1.3 Covering 43
5.2 Mounting 44
5.3 Scanner 45
Bandwidth and Storage 46
6.3 Redundancy 48
RAID 5 (Parity RAID) 49
Video Management 50
7.1.2 NVR-based 51
7.2.1 Monitoring 52
7.2.2 Recording 53
7.2.3 Playback 53
7.3 Advanced Features 54
7.4 Digital I/O Devices 54
7.5 Manage Large Systems 55
Applications 56
System Design 58
Chap.9 System Design 59
Section 1: Purpose 60
Section 3: Location 61
Section 7: Viewing Terminals 62
Section 8: Recording 62
Section 9: Maintenance 62
9.2 System Planning 63
9.3 Installation and Check 63
9.4 Operational Training 64
9.5 System Maintenance 65
Intelligent Video Systems 66
10.2.2 Distributed Platform 67
10.4 Detection 68
10.4.3 Loitering Detection 70
10.4.5 People Counting 71
Glossary 72

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