Datapath Wall Control - Manual (Page 74)

be applied to this Vision window only.
Reset
The Reset button will discard any changes you have made to the capture settings and display the source with default settings.
Resolution and Refresh
Width
The width specifies the horizontal resolution of the source.
Height
The height specifies the vertical resolution of the source.
Vertical Refresh
The Vertical Refresh specifies the vertical refresh rate of the captured source.
Cropping
The cropping controls allow you to display a specific area of the signal within the Vision window. The co-ordinates are relative to
the start position defined by Horizontal Position and Vertical Position.
For a single Vision window, a different cropping area is remembered for each video mode. If the source being captured
changes, a different cropping area is used.
If the source is VGA, the Overscan radio button can be selected. Overscan automatically configures the best cropping values
for displaying the full input signal.
Video Adjustments
The Video Adjustment controls describe the video timings being used to capture the source. Ideally, the values should match
the video timings of the source.
Horizontal Position
The Horizontal position specifies the offset, in pixels, from the end of the horizontal sync to the start of the active video.
Horizontal Size
The Horizontal size specifies the total number of pixels used to sample lines within the source. This includes the active portion
of video and blanking.
Phase
If the captured image is noisy, it may be that the signal is being sampled close to the transition between pixels. The Phase
control allows you alter the point at which the signal is sampled. You can think of it as a fine horizontal position control. This
control is not available when composite or S-Video is being captured.
Vertical Position
The Vertical position specifies the offset, in lines, from the end of the vertical sync to the start of the active video. This control is
not available when composite or S-Video is being captured.
Black Level
At the beginning of each line the source must be sampled to measure the black level. This sample is used as a reference for
determining the brightness of the pixels on the line. The Black Level control allows you to specify the position at which the black
level of the signal is sampled. This control is not available when composite or S-Video is being captured.
Note: The Video Adjustment settings are not available when a DVI source is being captured.
Video Standard
Select the required video standard from those available in the drop down menu.
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