3
Table of contents
Network video: overview, benefits and applications 7
1.1 Overview of a network video system
7
1.2 Benefits
8
1.3 Applications
12
1.3.1 Retail
12
1.3.2 Transportation
12
1.3.3 Education
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 finance
14
Network cameras
15
2.1
What is a network camera?
15
2.2
Types of network cameras
16
2.2.1 Fixed network cameras
17
2.2.2 Fixed dome network cameras
17
2.2.3 PTZ cameras and PTZ dome cameras
18
2.3
Day and night network cameras
21
2.4
Megapixel network cameras
23
2.5
Guidelines for selecting a network camera
24
Camera elements
27
3.1
Light sensitivity
27
3.2
Lens elements
28
3.2.1 Field of view
28
3.2.2 Matching lens and sensor
30
3.2.3 Lens mount standards
31
3.2.4 F-number and exposure
31
3.2.5 Manual or automatic iris
32
3.2.6 Depth of field
33
3.3
Image sensors
34
3.3.1 CCD technology
34
3.3.2 CMOS technology
34
3.3.3 Megapixel sensors
35
3.4
Image scanning techniques
35
3.4.1 Interlaced scanning
35
3.4.2 Progressive scanning
36
3.5
Image processing
37
3.5.1 Backlight compensation
37
3.5.2 Exposure zones
37
3.5.3 Wide dynamic range
37
3.6
Installing a network camera
38
TABLE OF CONTENTS
