USBOSDM2 Ver. 1.0.0
Page 14 Application Software User Manual
d.
Rectangle Overlay
Rectangle
overlay allows drawing coloured rectangles on video frame: minimum width (the
W:
field) and height (the
H:
field) are 2 pixels. Rectangle drawn is filled with foreground colour, but
has no background mode nor background colour.
e.
Box Overlay
Box
overlay is a special overlay type that has several features different from the
Rectangle
overlay:
Only 4
Box
overlay items are available for each
USBOSDM2
device
No
Blink
option for
Box
overlay
Box
overlay can have white
Boundary
Apart from the foreground colour,
Box
overlay
can also use some pre-defined “Box Colour”
Box
overlay and
Text
overlay can be overlapped to form some “Text with partially transparent
background” effect, such as this:
.
When
Box
overlay item is overlapped with other overlay items,
Box
overlay is always on top.
f.
Graphics File Overlay
Graphics File
overlay allows BITMAP, JPEG, GIF etc files to be overlaid on the video frame. Files
used must have 256-colour palette, byte-aligned in width, and be DIB section --- normal graphics
editing programs such as Microsoft Paint and Adobe PhotoShop etc. can create these graphics files.
When a graphics file is loaded as overlay, its
Palette
can be optionally loaded to replace the default
Palette (by ticking the
Use Palette
check box) ---- although doing so might improve the overlaid
graphics quality, it will also affect the colours used to draw other type of overlay items, such as text
or timer. Therefore when using
Graphics File
overlay with “
Use Palette
” ticked, it’s better to create
it before creating other overlay items such as text or timer.
Graphics File
overlay cannot
Blink
.
g.
Overlay Item Options
Current Item
: Number of the current overlay item whose options are displayed on screen.
Changing this will change other option values accordingly to reflect newly selected overlay item.
Overlay Type
: Select a type here before creating new overlay item. When
Current Item
value
changes, this field reflects the current item’s overlay type.
Disable Overlay:
Disable/Enable all overlay items on video frame.
Use Downloaded Font
: The current overlay item’s text will use downloaded font.
Download Item on Start
: Overlay items with this box ticked will be automatically re-drawn
when
USBOSDM2
program is started: this will take long time if too many items are defined.
Download
: Download the current font to
OSD
device: big font can take long time to download.
Delete
: Delete the current downloaded font.
List Font
: List all fonts already downloaded onto the RAM of
OSD
device.
Clear Screen
: Erase all overlay contents from the video frame without deleting the overlay
items. After a
Clear Screen
operation, any existing overlay item can be re-displayed by clicking
the “
Redraw”
or the “
Redraw All
”
button.
Test Colours
: List all colours of the current Palette (Colour Lookup Table) used.
Add Item
: Create a new
Overlay Item.
