Axis Network video Specifications Page 27
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Camera elements
There are a number of camera elements that have an impact on image quality and
eld of view and are, therefore, important to understand when choosing a network
camera. The elements include the light sensitivity of a camera, the type of lens, type of
image sensor and scanning technique, as well as image processing functionalities, all
of which are discussed in this chapter. Some guidelines on installation considerations
are also provided at the end.
3.1 Light sensitivity
A network camera’s light sensitivity is often specied in terms of lux, which corresponds to a
level of illuminance in which a camera produces an acceptable image. The lower the lux speci-
cation, the better light sensitivity the camera has. Normally, at least 200 lux is needed to
illuminate an object so that a good quality image can be obtained. In general, the more light on
the subject, the better the image. With too little light, focusing will be dicult and the image
will be noisy and/or dark. To capture good quality images in low light or dark conditions, a day
and night camera that takes advantage of near-infrared light is required. For more on day and
night cameras, see Chapter 2.
Dierent light conditions oer dierent illuminance. Many natural scenes have fairly complex
illumination, with both shadows and highlights that give dierent lux readings in dierent parts
of a scene. It is important, therefore, to keep in mind that one lux reading does not indicate the
light condition for a scene as a whole.
Table 3.1a Examples of dierent levels of illuminance.
CAMERA ELEMENTS - CHAPTER 3
Illuminance Lighting condition
100,000 lux Strong sunlight
10,000 lux Full daylight
500 lux Oce light
100 lux Poorly lit room
- 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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