MICROTRONIX DX-4400 Series, Руководство пользователя

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DX-4400
– 3G-SDI Text & Graphics Overlay Inserter – User Manual
Page 27 of 125
The video output of the Overlay Layer is updated by the ARM rendering the graphics to the video frame buffer.
The amount of time required to render the graphic items is dependent on the number of items on the Overlay
Layer.
All Overlay Fields are associated with a Saveset stored in the system Configuration Database. The DX-4400
always has a Saveset named "default" which cannot be deleted. You can create/delete your own named
Savesets allowing the user to define different Overlay Configurations. When you delete a Saveset, all the Fields
are removed from the overlay display.
For each Saveset, the Fields are numbered 1 through 999 by the ID parameter. Each of the four types of Fields
(Text, Graphics, Images and QML) use separate ID values.
The Toggle and DIP Switch User Defined Command are numbered 1 through 15 by the ID parameter. (Refer to
Table 24: Toggle Switch
– User Defined Command Syntax and Table 25: DIP Switch User Defined Command
Syntax for more information.)
By default, all Graphic Fields are visible and have default parameters (attribute settings). For example, the
following Graphic Field Command draws a simple rectangle positioned with the top left corner at 100, 100. The
rectangle has a length of 400 (X distance) and height of 200 (Y distance). The rectangle has a default border
Color of white with white fill and no transparency.
G ID=1 S=rectangle X=100 Y=100 L=400 H=200 ‘ add user comment if required
Each Graphic Field can be turned on or off independently by the Visibility parameter V taking a value of YES or
NO. For example, to turn off the visibility of the above rectangle enter the command.
G ID=1 V=no ‘ Turn graphic ID 1 visibility OFF
A Graphic Field is updated when a change occurs.
3.8.1 Coordinate System and Field Position
Each Overlay Field has three position coordinates referred to as X, Y and Z with a default value of zero. One or all
of these coordinates may be used when defining a Field.
The coordinate system designates x=0000 and y=0000 as the top-left corner of the overlay for all video formats.
This is the default position for all Fields.
The maximum value for the x and y coordinates is located at the bottom-right corner of the frame.
•
For Digital Cinema 2160p video formats the bottom-right corner is at coordinates x=4095, y=2159.
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For UHD 2160p video formats the bottom-right corner is at coordinates x=3839, y=2159.
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For 1080p, 1080i, and 1080PsF formats the bottom-right corner is at coordinates x=1919, y=1079.
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For 720p video formats the bottom-right corner is located at x=1279, y=719.
•
For NTSC video format the coordinates are x=719, y=485, and for PAL format x=719 and y=575.
Note: Some monitors will not display the entire video frame, particularly when operating in NTSC or PAL
modes. Graphic Fields placed close to the edges of the overlay may not be visible on some monitors.
Any Field or portion of a Field that extends beyond the edges of the Overlay will not be visible.
The Z position allows you to stack the Fields on top of each other. If the alpha value is other than zero the Fields
will be blended with the higher Z value being at the top.
Note: By default, all fields are at Z position 0, but fields with higher ID numbers are placed above fields with
lower ID numbers and will be blended above them.
Note: When Fields of different types overlap, and the Fields have the same Z layer (or no Z layer has been
defined) the Fields may not appear in the same order after power cycling the DX-4400. This occurs
because as Fields are being defined, they are drawn in the order the commands are given to the
DX-4400, but at power up the Fields are drawn by their type and in order of ascending ID numbers
with Text Fields drawn first, followed by Image Fields, followed Graphic Fields, and then QML Fields.