User`s guide

User’s Guide
2 Technical Overview
DIGITAL VIDEO PROCESSING
Video Encoding
The video encoder continuously analyses the video inputs (signals from the cameras),
and then generates a video signal for recording which contains field by field samples
of each camera. The processor includes important information in the encoded output
signals, including the date, time, camera title, camera number and alarm status. The
encoded video signal recorded by the VCR looks like the following example. Each
block represents a field of camera input.
The processor also digitally generates the monitor display video signal, according to
the layout of windows selected by the user.
Video Decoding
During video playback, the process is reversed. The video decoder decodes the
sequence of fields from the VCR and then reallocates the video signal from each
recorded camera to the appropriate window on the monitor. The date/time stamp
and other recorded information including alarm status, video loss, camera title, etc.
are also decoded and displayed.
Figure 1 — Video Encoding