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2.2.1 Fixed network cameras
A xed network camera, which may come with a xed or varifocal lens, is a camera that has a
xed eld of view (normal/telephoto/wide-angle) once it is mounted. A xed camera is the
traditional camera type where the camera and the direction in which it is pointing are clearly
visible. This type of camera represents the best choice in applications where it is advantageous
to make the camera very visible. A xed camera usually enables its lens to be changed. Fixed
cameras can be installed in housings designed for indoor or outdoor installation.
Figure 2.2a Fixed network cameras including wireless and megapixel versions.
2.2.2 Fixed dome network cameras
A xed dome network camera, also called a mini dome, essentially involves a xed camera that
is pre-installed in a small dome housing. The camera can be directed to point in any direction.
Its main benet lies in its discreet, non-obtrusive design, as well as in the fact that it is hard to
see in which direction the camera is pointing. The camera is also tamper resistant.
One of the limitations of a xed dome camera is that it rarely comes with an exchangeable lens,
and even if it is exchangeable, the choice of lenses is limited by the space inside the dome
housing. To compensate for this, a varifocal lens is often provided to enable the camera’s eld
of view to be adjusted.
Axis xed dome cameras are designed with dierent types of enclosures such as vandal-resistant
and/or IP66-rated for outdoor installations. No external housing is required. The mounting of such
a camera is usually on a wall or ceiling.
Figure 2.2b Fixed dome network cameras. From left to right: AXIS 209FD and AXIS 216FD (also available in
ruggedized and megapixel versions), AXIS P3301 and AXIS 225FD.
NETWORK CAMERAS - CHAPTER 2
- 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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