Game Development Reference
In-Depth Information
10.2.2 Features in Video Analysis System
With the development of computer vision technology, many video analysis systems
and applications are proposed, e.g., the intelligent video system provided by Axis,
IBM, and IntelliVision. The IBM intelligent Video Analytics can be regarded as a
centralized intelligent video system, which can monitor video streams in near real
time, automatically generate alerts, and facilitates forensic analysis of historical data
to identify specific incidents, trends and patterns. In this subsection, we introduce
some common functionalities in common intelligent video systems, including active
tempering alarm, object segment, motion detection, pedestrian detection, special
event detection, and object tracking.
Motion detection
. Video motion detection is the original, basic, and prevalent
intelligent video application within video surveillance. It is primarily used to reduce
the amount of videos to be stored by flagging video that has changes and eliminating
video in which nothing changes. By only storing videos in which changes occur,
security personnel can store videos for a greater time period on a given storage
capacity. It is also used to flag events to operators, such as persons entering locked
areas, for immediate action. Video motion detection is the foundation for a large
number of more advanced video analytics, such as people counting, digital fences,
and object tracking.
Image segmentation
. It is also a basic computer vision technique, which parti-
tions the digital image into multiple parts based on the objects in images. The goal
of segmentation is to simplify and/or change the representation of an image into
something more meaningful and easier to analyze. It also can reduce the complexity
of video analysis because there are only a few segments left in an image.
Pedestrian detection
. It is an essential and significant task in any intelligent video
system, as it provides the fundamental information for semantic understanding of
the video footages. It can help security personnel monitor whether there are visitors
entering restricted zones and send out a warning to the pedestrian.
Event detection
. It is a method of tracking and analyzing streams of information
about things that happen and deriving a conclusion according to them, which needs
to combine data from multiple sources to infer events or patterns that suggest more
complicated circumstances. The goal of event detection is to identify meaningful
events (such as traffic jamor threats) and respond as quickly as possible. For example,
the traffic jam detection can help to provide reasonable traveling route for visitors.
Video tracking
. It is the process of locating a moving object (or multiple objects)
over time using a camera. These techniques have been used extensively in traffic
surveillance for security. It can help users to focus a special vehicle or person easily
among lots of objects and find meaningful events.
Active tempering alarm
. This functionality alerts security personnel when there
is disrupted camera operation caused by vandalism or accident, such as redirection,
blocking, or defocusing of cameras. The product is especially useful in schools,
prisons, public transportation, and in harsh environments where weather, vibration,
or dirt can disturb the cameras' performance. Without active tampering alarm, it
