Axis Network video Spécifications Page 51
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
51
Resolutions
Resolution in an analog or digital world is similar, but there are some important
dierences in how it is dened. In analog video, an image consists of lines or
TV-lines since analog video technology is derived from the television industry. In a digital
system, an image is made up of square pixels.
The sections below describe the dierent resolutions that network video can provide.
They include NTSC, PAL, VGA, megapixel and HDTV.
6.1 NTSC and PAL resolutions
NTSC (National Television System Committee) and PAL (Phase Alternating Line) resolutions are
analog video standards. They are relevant to network video since video encoders provide such
resolutions when they digitize signals from analog cameras. Current PTZ network cameras and
PTZ dome network cameras also provide NTSC and PAL resolutions since such cameras today use
a camera block (which incorporates the camera, zoom, auto-focus and auto-iris functions) made
for analog video cameras, in conjunction with a built-in video encoder board.
In North America and Japan, the NTSC standard is the predominant analog video standard, while
in Europe and many Asian and African countries, the PAL standard is used. Both standards origi-
nate from the television industry. NTSC has a resolution of 480 lines and uses a refresh rate of 60
interlaced elds per second (or 30 full frames per second). A new naming convention, which
denes the number of lines, type of scan and refresh rate, for this standard is 480i60
(“i” stands for interlaced scanning). PAL has a resolution with 576 lines and uses a refresh rate of
50 interlaced elds per second (or 25 full frames per second). The new naming convention for this
standard is 576i50. The total amount of information per second is the same in both standards.
When analog video is digitized, the maximum amount of pixels that can be created is based on
the number of TV lines available to be digitized. The maximum size of a digitized image is typi-
cally D1 and the most commonly used resolution is 4CIF.
RESOLUTIONS - CHAPTER 6
- 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
14
Positions
14
Figure 3.2
15
Connection
15
Diagram
15
Chapter 3
16
Figure 3.5
17
Grounding
17
Figure 4.1
21
Figure 4.2
22
Figure 4.3
23
Figure 4.4
24
Figure 5.1
28
Location
28
Figure 5.2
31
Appendix A
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Appendix B
40
Figure B.2
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