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Once the type of recording method is selected, the quality of the recordings can be determined
by selecting the video format (e.g., H.264, MPEG-4, Motion JPEG), resolution, compression level
and frame rate. These parameters will aect the amount of bandwidth used, as well as the size
of storage space required.
Network video products may have varying frame rate capabilities depending on the resolution.
Recording and/or viewing at full frame rate (considered as 30 frames per second in NTSC stan-
dard and 25 frames per second in PAL standard) on all cameras at all times is more than what
is required for most applications. Frame rates under normal conditions can be set lower—for
example, one to four frames per second—to dramatically decrease storage requirements. In the
event of an alarm—for instance, if video motion detection or an external sensor is triggered—
a separate stream with a higher recording frame rate can be sent.
11.3.4 Recording and storage
Most video management software use the standard Windows le system for storage, so any
system drive or network-attached drive can be used for storing video. A video management
software program may enable more than one level of storage; for instance, recordings are made
on a primary hard drive (the local hard disk) and archiving takes place on either local disks,
network-attached drive or remote hard drive. Users may be able to specify how long images
should remain on the primary hard drive before they are automatically deleted or moved to the
archive drive. Users may also be able to prevent event-triggered video from being deleted auto-
matically by specially marking or locking them in the system.
11.3.5 Event management and intelligent video
Event management is about identifying or creating an event that is triggered by inputs,
whether from built-in features in the network video products or from other systems such as
point-of-sale terminals or intelligent video software, and conguring the network video surveil-
lance system to automatically respond to the event by, for example, recording video, sending
alert notications and activating dierent devices such as doors and lights.
Event management and intelligent video functionalities can work together to enable a video
surveillance system to more eciently use network bandwidth and storage space. Live camera
monitoring is not required all the time since alert notications to operators can be sent when
an event occurs. All congured responses can be activated automatically, improving response
times. Event management helps operators cover more cameras.
Both event management and intelligent video functionalities can be built-in and conducted in a
network video product or in a video management software program. It can also be handled by both
in the sense that a video management software program can take advantage of an intelligent
video functionality that is built into a network video product. In such a case, the intelligent video
functionality, such as video motion detection and camera tampering, can be performed by the
VIDEO MANAGEMENT SYSTEMS - CHAPTER 11
- 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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