Video Tape Recorder
Next to the hassle of a videotape surveillance system, picture
quality on videotape is poor. In part, because tape systems
share four or more pictures in one video frame, in part because
the picture quality on videotape degrades each time it is
used (due to head wear, tape stretch, and decomposition of
the videotape coating).
Locating footage on tape can also be time-consuming. Trying
to find the image for printing by fast forwarding and reversing
the control buttons requires a stroke of luck. More than likely
the printed image will be blurry, fuzzy or unidentifiable.
Digital Video Recording
Locating requested video footage on DVR can be done in seconds,
then it is saved as a JPG, BMP or AVI file to floppy or CD.
A DVR system uses a calendar-assisted search tool that allows
fast and efficient searching by day, date or time. DVR images
are stored on the computer’s hard drive rather than
on videotape. This not only preserves the picture quality
in its original state, but allows fast data retrieval.
DVR technologies offer far more features and capabilities
than former switches, multiplexers and videotape recorders.
This is why, selecting the proper DVR is not for the faint
of heart. Basic questions ought to be answered:
- How many frames can be downloaded per second?
- Is motion detection software or hardware driven?
- What is the remote device controlling ability?
- What type of cabling is required to hook up the cameras?
- Can cameras be programmed independently?
- Does the system support Pan/Tilt/Zoom cameras?
Network Video Recording
Network Video Recording consists in a digital video recording
solution that works over a TCP/IP network. There are many
benefits to integrating a Network Video Recording solution,
or NVR. IP addressable network cameras and/or video servers
transmit images over a LAN, WAN or across the Internet to
a centrally managed NVR. The NVR offers features never before
possible with legacy solutions. This technology is backward
compatible with all legacy analog CCTV equipment.
Systems can be configured to record terabytes of video, unlike
traditional digital recording solutions that are usually bound
to the storage device in the unit. This trend has raised an
important question. What video compression format should be
used among the four most commonly available in network video
recording solutions: Wavelet, MPEG-4, H.263, or Motion-JPEG.
Network video recording solutions are gaining market share
and the NVR rapidly becomes the industry standard. Hence,
knowledge about the key features and functions, as well as
how the core technology works is imperative to making a sound
Convergix can help you in the assessment of your needs, the
identification of your requirements, the comparison of alternatives,
the bid and selection process as well as the coordination
of the system implementation.