Technical Overview; Digital Picture Processing; Sensitivity Settings; Image Quality Settings - American Dynamics Intellex Intellex DVMS Operating Instructions Manual

Chapter 1 — Introduction 5

TECHNICAL OVERVIEW

The Intellex unit processes video images from each camera

Digital Picture Processing

and stores them in the unit's image database.
The unit stores two types of images. It selects a reference im-
age, which is a complete image, and compresses the image's
information. The unit can decompress this information into a
complete image at a later time.
The unit also stores "delta" images. It identifies the elements
of a new image that have changed. The unit then compresses
this information. Delta images contain less information than
reference images. Therefore, they require less storage space,
but they are incomplete without the reference image.
After the unit processes a certain number of delta images, it
selects a new reference image. Delta images from a low activ-
ity area are small. Conversely, delta images from a high activ-
ity area are large.

Sensitivity Settings

The Intellex unit lets you control how it responds to subtle
changes between delta images.
At the Normal Sensitivity setting, the unit ignores smaller,
more subtle changes between images.
At the High Sensitivity setting, the unit records the smaller
changes between images, improving the perceived picture
quality. As a result, this setting requires more storage space.

Image Quality Settings

The Intellex unit lets you control image quality to give you the
best combination of quality and storage for your installation.
Select different qualities for normal system operation, for spe-
cific cameras at specific times and for alarm operation.
At the Super Resolution setting, the unit uses the lowest level
of compression and maintains the best image quality. This set-
ting requires the highest amount of storage space and decreases
the unit's capacity.
At the Extended Record setting, the unit uses the highest level
of compression and requires the least amount of storage space.
Using this setting increases the unit's capacity, but the finer
image detail is lost.