DX-2200
– Dual-view 2x1 SDI Video Switcher
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When the zoom position is at 25%, the left / top of zoom window will be at the left /
top of the video window, and when the zoom position is at 75%, the right / bottom
edge of the zoom window will be at the right / bottom of the input video. Attempting
to move the zoom center outside the range of 25% to 75% won’t have any
additional effect. If the zoom center is set to 20%, and then later if the zoom
percentage is increased to 400%, the zoom center will move to the 20% position
because the zoom window is now smaller and fits within the video when located at
the 20% position.
The second method of setting the zoom is by specifying a window by the x and y
position of the top left corner, and the size. All parameters for this control method
are specified in pixels.
This ‘ZSW’ command enables control by top left corner and
size. The zoom window position is set by the
‘ZSLXnnn’ and ‘ZSLYnnn’
commands. The zoom size is set by the ‘ZSLWnnn’ and ‘ZSLHnnn’ commands.
The minimum zoom window the DX-2200 will display is 64 x 64 pixels. If the
requested zoom window is larger than the input video size, the window will be
reduced to the video size. If the position places the window outside the input
video, then the position is automatically adjusted to make the window fit.
For example, if the commands: ZSLX100;ZSLY100;ZSLW1600;ZSLH900 are
sent, and the video input at the selected input connector is 1280x720, the DX-
2200 will reduce the window size to 1280x720, and since a window of this size can
only fit within the input video when located at (0,0), the output of the Digital Zoom
will be the full input video. If the input resolution is later changed to 1920x1080,
then the DX-2200 will output a 1600x900 pixel region of the input signal with a top
left corner at x=100, y=100.
Note: If the aspect ratio of the chosen zoom window does not match the aspect
ratio of the output video window, the video will be distorted (stretched or
compressed to fit).
The Digital Zoom feature operates in all Display Modes, but functionality is
reduced when operating in Mode 4 (Split Screen). In this mode, only the zoom
factor in percent can be used, regardless of what zoom control mode has been
selected, and the zoom center position cannot be changed. The intended purpose
of the Split Screen Mode requires that the zoom position is fixed.
Note:
The zoom window horizontal position and width are truncated to an even
pixel number by the DX-2200, resulting in a minimum two pixel resolution
for setting the size and position of the window. For interlaced video, the
vertical zoom window position and height have a two pixel resolution.
Table 18: Digital Zoom Command Codes
Command Code
Mode of Operation
Zoom Commands
ZR
Reset the zoom control mode to zoom/center position
mode. Reset the position to center (50%) and the
zoom factor to 100% for all channels.
ZSP
Set the zoom control mode for the
selected
input to be
the zoom/center position mode.
Summary of Contents for DX-2200-SW-02
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