User guide

92 DSView Installer/User Guide
NOTE: Noise Threshold and Priority Threshold settings are available if you are using standard video
compression. Block Noise Threshold and Pixel Noise Threshold settings are available if you are using the DSR
switch DVC algorithm upgrade. The DVC algorithm upgrade is standard on all newer DS appliances/DSR
switches. Older DS appliances/DSR switches use standard video compression. For DVC algorithm upgrade
purchase information, contact Avocent Technical Support or your Avocent reseller.
The following sections describe the effects of the video adjustments.
Image Capture Width, Image Capture Height, Image Capture Horizontal
Position and Image Capture Vertical Position
The Image Capture Width, Image Capture Height, Image Capture Horizontal Position and Image
Capture Vertical Position adjustments affect how the target video is captured and digitized and are
seldom changed.
The image capture parameters are automatically changed by the Automatic Adjustment function. A
special image is required on the target in order to make accurate adjustments independently.
Contrast and brightness
If the image in the Video Viewer window is not clear, select Tools - Automatic Video Adjust first.
This command is also available in the Video Adjustments dialog box. In most cases, this will
correct video problems. In those cases where clicking on Auto Adjust several times does not clear
up a mottled screen, adjusting the contrast and brightness may help.
First increase the brightness. Do not go more that 10 increments before moving the contrast.
Generally the contrast should be moved very little.
When the packet count gets close to zero (0), refresh the screen. If the packet count stays at 0, the
video adjustment is completed.
Detection thresholds
In some cases, noise in the video transmission keeps the packets/sec count up. This may be seen
when little dots change in the area of the cursor when it is moved. Varying the threshold values
may result in “quieter” screens and improved cursor tracking.
Noise Threshold and Priority Threshold values may be modified if you are using standard video
compression. Block Noise Threshold and Pixel Noise Threshold values may be modified if you are
using the DSR switch DVC algorithm upgrade. Default threshold values can be restored by clicking
Auto Adjust Video.
Letter Description Letter Description
G
Noise Threshold or Block
Noise Threshold
O Close box
H
Priority Threshold or Pixel
Noise Threshold
Table 6.2: Manual Video Adjust Dialog Box Descriptions (Continued)