Knowledge Base
A Digital Video Recorder (DVR) is a device that receives
video taken by the camera, convert it into digital format, and records on to a
hard drive.
Simply put, PC-based DVR is made by combining a DVR Board and its software with components of a personal computer.
The benefits of PC-Based DVR vs. videocassette recorders:
- Low maintenance – No tapes to
rewind or replace.
- Non-stop recording – Once all of the hard drive space has been filled, the software records over the earliest date.
- Adjustable recording – User
can set specific schedules for each day of the week on different cameras. Options include full recording, motion
detection recording, sensor recording and no recording.
- Superior image quality –
Digital recording never fades for distorts.
- Fast search & retrieval –
Enter the date and time or just use the mouse to click on a timeline. Recording is uninterrupted during search.
- Superior archiving
capabilities – Back-up recorded data to any recordable media (e.g. CD, DVD,
memory stick, external hard drive, etc)
- Remote transmission &
networking – View live video or search archive remotely through the Internet.
- Ease of Use - With the use of a mouse and keyboard, it
is user friendly and easy to configure.
As
illustrated above, the analog signal from the camera is sent to the DVR. From there, it is sent to the PC or TV/OUT
monitor for viewing, and compressed in MPEG-4 format.
The
compressed data is recorded onto the hard drive or sent over the Internet for
remote viewing. The recorded images,
now digital, can be easily searched or copied to CD, DVD, or any other memory
device hooked to the system.
Use of
video surveillance can benefit countless aspects of public and private
life. Presence of cameras prevent
crimes and provide evidence against offenders.
Examples of Applications:
Retail –
Includes restaurants, convenient stores, amusement parks, and others. Prevent shrinkage from customers and
employees, protect against frivolous lawsuits, verify transactions, etc.
Transportation –
Traffic information with real-time view of streets and highways, prevent crimes
against passengers at bus stops and train stations. Prevent possible terrorist attacks, illegal immigration, drug
trafficking, vandalism, and much more.
Government – Keep
track of people entering and leaving public buildings, ensure safety of
citizens in public areas such as parks, museums, government buildings.
Industrial –
Monitor automated production lines, keep track of inventory, and prevent theft
in warehouses.
Education – Help
reduce harassment and violence toward students and staff. Prevent property damage during and after
school hours.