Axis Network video Spécifications Page 45
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
45
Video encoders
Video encoders, also known as video servers, enable an existing analog CCTV video
surveillance system to be integrated with a network video system. Video encoders
play a signicant role in installations where many analog cameras are to be main-
tained. This chapter describes what a video encoder is and its benets, and provides
an overview of its components and the dierent types of video encoders available.
A brief discussion on deinterlacing techniques is also included, in addition to a section
on video decoders.
5.1 What is a video encoder?
A video encoder makes it possible for an analog CCTV system to migrate to a network video sys-
tem. It enables users to gain the benets of network video without having to discard existing
analog equipment such as analog CCTV cameras and coaxial cabling.
A video encoder connects to an analog video camera via a coaxial cable and converts analog
video signals into digital video streams that are then sent over a wired or wireless IP-based net-
work (e.g., LAN, WLAN or Internet). To view and/or record the digital video, computer monitors
and PCs can be used instead of DVRs or VCRs and analog monitors.
Figure 5.1a An illustration of how analog video cameras and analog monitors can be integrated with a network
video system using video encoders and decoders.
VIDEO ENCODERS - CHAPTER 5
AXIS Q7406
Video Encoder
Blade
AXIS Q7406
Video Encoder Blade
0
-
0
-
AXIS Q7900 Rack
100-240
50-50 Hz
4-2 A
FNP 30
P
ower-one
AC
ACTIVITY
LOOP
NETWORK
1
2
3
4
PS1
PS2
FANS
POWER
POWER
100-240 AC
50-50 Hz
4-2 A
FNP 30
P
ower-one
AC
Computer with
video management
software
Axis network cameras
Axis video encoders
Computer
with web
browser
Web
browser
Office
Home
Analog
cameras
IP NETWORK
INTERNET
AUDIO
I/O
IN
OUT
1 2 3 4 5 6
AXIS 292
Network Video Decoder
VIDEO
ON/OFF
POWER
STATUS
NETWORK
VIDEO
Axis video
decoder
Analog
monitor
- Table of contents 3
- Network technologies 69 5
- Wireless technologies 87 5
- Video management systems 91 5
- TABLE OF CONTENTS 5
- 1.2 Benets 8
- 1.3 Applications 12
- 1.3.4 Industrial 13
- 1.3.5 City surveillance 13
- 1.3.6 Government 13
- 1.3.7 Healthcare 13
- 1.3.8 Banking and nance 14
- Network cameras 15
- 2.2 Types of network cameras 16
- 2.2.1 Fixed network cameras 17
- 700 nm to 1000 nm range 22
- Camera elements 27
- 3.2 Lens elements 28
- 3.2.3 Lens mount standards 31
- 3.2.4 F-number and exposure 31
- 3.2.6 Depth of eld 33
- 3.3 Image sensors 34
- 3.3.3 Megapixel sensors 35
- 3.4.1 Interlaced scanning 35
- 3.4.2 Progressive scanning 36
- 3.5 Image processing 37
- 4.2 Transparent covering 40
- 4.4 Environmental protection 41
- 4.5.2 Mounting 42
- 4.6 Types of mounting 43
- 4.6.2 Wall mounts 44
- 4.6.3 Pole mounts 44
- 4.6.4 Parapet mounts 44
- 5.1 What is a video encoder? 45
- 5.5 Deinterlacing techniques 49
- 5.6 Video decoder 50
- Resolutions 51
- 6.2 VGA resolutions 52
- 6.3 Megapixel resolutions 53
- Video compression 55
- Earlier reference frame 57
- 7.2 Compression formats 59
- 7.2.2 MPEG-4 60
- 7.4 Comparing standards 61
- CHAPTER 7 - VIDEO COMPRESSION 62
- 8.1 Audio applications 63
- AUDIO Stream 64
- VIDEO Stream 64
- Recording/monitoring 64
- 8.3.1 Simplex 65
- 8.4 Audio detection alarm 66
- 8.5 Audio compression 66
- 8.5.1 Sampling frequency 67
- 8.5.2 Bit rate 67
- 8.5.3 Audio codecs 67
- Network technologies 69
- 9.1.2. Switch 71
- 9.1.3 Power over Ethernet 73
- 9.2 The Internet 75
- 9.2.1 IP addressing 76
- 9.2.1.1 IPv4 addresses 76
- 9.2.1.2 IPv6 addresses 80
- 9.3 VLANs 82
- 9.4 Quality of Service 82
- FTP 2 83
- Video 5 83
- HTTP 3 83
- 9.5 Network Security 84
- 9.5.4 HTTPS or SSL/TLS 85
- VPN tunnel 86
- HTTPS or SSL/TLS encryption 86
- Secure Non-secure 86
- Wireless technologies 87
- 10.1 802.11 WLAN standards 88
- 10.2 WLAN security 88
- 10.3 Wireless bridges 89
- Video management systems 91
- 11.1.2 NVR platform 92
- 11.2 Software platforms 93
- 11.3 System features 94
- 11.3.1 Viewing 95
- 11.3.2 Multi-streaming 95
- 11.3.3 Video recording 96
- 11.3.4 Recording and storage 97
- 11.3.7 Security 103
- 11.4 Integrated systems 104
- 11.4.3 Access control 105
- 11.4.4 Building management 105
- 11.4.6 RFID 106
- Table 12.1b 109
- Table 12.1c 109
- 12.2 Server-based storage 110
- 12.3 NAS and SAN 110
- 12.4 Redundant storage 112
- 12.5 System congurations 113
- Surveillance 114
- IP NETWORK 114
- Tools and resources 115
- Axis Communications’ Academy 117
- Contact information 118
- About Axis Communications 120
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Table des matières
Input W
9
Chapter 2
10
Figure 3.1
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Positions
14
Figure 3.2
15
Connection
15
Diagram
15
Chapter 3
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Figure 3.5
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Grounding
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Figure 4.1
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Figure 4.2
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Figure 4.3
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Figure 4.4
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Figure 5.1
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Location
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Figure 5.2
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Appendix A
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Appendix B
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Figure B.2
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