Video Compression

How is IP Video Surveillance Revolutionary?

High Definition Combined with the Minimization of Information

In order to reproduce images and sounds, analog technology continuously records signals, and transmits a copy of reality. IP technology only takes certain sequences of this reality—a little bit like your eyes do when using a high frequency stroboscope. It then transforms this information into code. It therefore doesn’t retransmit reality in the pure sense, but rather a codification where each shape and sound has a number. These codes are then transmitted via the network and received by the server, which will convert them into images and sounds. This transmission of codes cannot be altered, compared to a copy of a copy of reality, which loses quality each time. With this technological progress, IP cameras may transmit a lot more information at very high speeds—up to 25 images per second—producing visibly superior definition and precision of detail than analog cameras, e.g. reading a license plate from a great distance or the clarity of a person’s face.

The surveillance of much larger areas can be done because IP cameras do not need to be plugged into the server. This freedom and high-precision offer a very complete solution that requires fewer cameras than an analog surveillance system.

The booming commercialization of IP cameras these last few years has increased the range of models available and the solutions they offer.

Information Digitization and Decentralization

With the digitization of information, both the analog and IP systems make it possible to view videos in real time and by several preauthorized users (head office, personnel, and so on) simultaneously. What’s more, these users can control the cameras (zoom, rotate, view another camera). Surveillance is decentralized and becomes much more effective.

The analog systems however, require recordings to be encoded in digital form.

Advantage: Diverse Storage Solutions

As discussed previously, IP technology records numeric codes. There are multiple, compact, and inexpensive ways to store recorded data from IP cameras. In particular, these storage devices are compatible one with another, allowing the easy transfer of data between them:

-       On SD card (directly on the camera)

-       On an external hard drive

-       On a network recorder

-       On a network server

-       On a network-attached storage (NAS)

-       In Cloud computing

-       On video platforms