User manual

85XX Series Network DVR User Manual……………………………………………………………………….V1.0
- 92 -
 Fixed: A fixed size black border is present on all sides which blanks out the moving edges of the
image. The size of the borders is equal to the maximum frame shift (see below).
 None: Old frames are not displayed. Regions of the output image for which there is no available data
are filled with black
4. 4.8.3 Camera Installation Mode
The camera installation mode has 3 options:
 Fixed/PTZ: [Default] The stabilization algorithm parameters are optimized to give the best
stabilization results for fixed/PTZ cameras.
 In vehicle/Hand held: The stabilization algorithm parameters are optimized to give the best
stabilization performance for cameras where the camera fixture experiences continued, large
displacements or scene changes. E.g. when shot from a moving vehicle.
 Low Frequency Stabilization: The Fixed/PTZ and In vehicle/hand held stabilization modes are
designed to allow tracking of intentional camera panning by not stabilizing low frequency movements
(< 1Hz). The Low Frequency mode has a lower cut-off frequency to allow better low frequency
stabilization at the expense of worse tracking of intentional movement. This mode will automatically
switch to the higher frequency mode when excessive movement in one direction is detected in order to
allow better tracking of intentional movement. Once this movement has stopped it will revert back to
the low frequency mode.
4.4.8.4 Auto Disable
There are 2 options for Auto Disable - neither is selected by default:
 Pan/Tilt: This option disables the stabilization when excessive pan or tilt motion is detected. This
makes it easier to control pan/tilt cameras because the Stabilizer ceases to oppose operator pan/tilt
commands above the threshold. Once panning stops, there is a 3 second timeout period before
stabilization is reactivated.
 Low Detail: When this option is enabled, the algorithm is disabled when a scene with insufficient detail
for reliable stabilization is detected. This prevents the image position 'hunting’ when there is very little
scene detail or features. For example, when the camera is pointed at a completely blank wall the
stabilized image will jump around slightly because it is locking on to the random video noise. Similar
hunting problems can occur in other situations where a large part of the scene lacks suitable detail for
Stabilizer lock.
4.4.8.5 Performance
Performance setting of the algorithm. Better stabilization performance comes at the expense of higher DSP
load. The default setting is low.
4.4.8.6 Maximum Frame Shift
This is the maximum amount in image pixels that the algorithm will shift the frame horizontally and vertically in
either direction from the normal position. Both horizontal and vertical shifts are configurable in the range [24 -
256], the default is 128.
4.4.9 Generationg Extemal Event Notifications
It is possible to assign the VCA alarms to trigger external events, e.g. a relay contact closure, a TCP/IP
message, etc.