User`s guide

From Video D evice
ROI position
Use this field to input a row vector that specifies the region of
acquisition in the video image. The format is [row, column, height,
width]. The default values for row and column are 0. The default
values for height and w idth are set to the maximum allowable
value, indicated by the video format’s resolution. Therefore you
only need to cha nge the va lues in th is field if you do not want
to capture the full image size.
Preview bu tton
Preview the video image. It opens the Video Preview window that
is part of Image Acquisition Toolbox. If you change something
in the Source Block Parameters dialog b ox while the preview is
running, the image will adjust accordingly. This lets you set up
yourimageacquisitiontothewayyouwantittobeacquiredby
the block when y ou run the model.
Block sample time
Specify the sample time of the block during the simulation. This
is the rate at w hich the block is executed during simulation. The
default is 1/30.
Note The b lock sample time does not set the frame rate on the
device that is used in simulation. Frame rate is determined by
the video format specified (standard format or from a camera
file). Some devices even list frame rate as a device-specific source
property. Frame rate is not related to the Block sample time
optioninthedialog.Blocksampletimedefinestherateatwhich
the block executes during simulation time.
Ports mode
Used to specify either a single output port for all color spaces, or
one port for each band (for example, R, G, B). When you select
One
multidimensional signal
, the output signal will be combined
into one line consisting of signal information for all color signals.
Select
Separate color signals ifyouwanttousethreeports
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