User guide

Chapter 6: Using the Video Viewer Window 253
The following sections describe the effects of the video adjustments.
Image Capture Width, Pixel Sampling/Fine Adjust, Image Capture
Horizontal Position and Image Capture Vertical Position
The Image Capture Width, Pixel Sampling/Fine Adjust, 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 too dark or too light, select Tools - Automatic Video
Adjust or click the Automatic Video Adjust button 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 set the contrast and brightness as desired,
adjusting the contrast and brightness manually 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.
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.
Table 6.2: Manual VIdeo Adjust Dialog Box Descriptions
Letter Description Letter Description
A Image Capture Width H Pixel Noise Threshold
B Pixel Sampling/Fine Adjust I Automatic Video Adjustment
C Image Capture Horizontal Position J Refresh Image
D Image Capture Vertical Position K Adjustment bar
E Contrast L Video Test Pattern
F Brightness M Performance Monitor
G Block Noise Threshold N Close button