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The type and relative position of the
Trigger
in the captured video sequence.
I
MAGE SIZE AND POSITION
By default the FastCamera is set to capture video with the full resolution of the image
sensor in the camera. For various reasons that include increased capture speed and
number of image frames that can be stored in the camera internal memory, you may
choose to limit capture to a Region-Of-Interest (ROI) smaller than the full image frame. To
change ROI click on the
Set ROI
button to the left on the Video Preview Display area...
Figure 6, Changing ROI of the video capture
The
'Adjust ROI'
combo box selects the height and width of the image to be recorded to
memory. The allowed
widths
go in steps of 10 pixels
. The
'Height'
combo box selects
the number of lines in the image. Make your change and click on the
‘Apply’
button. The
new image size will be sent to the camera and also reflected in the display at the upper
right corner that shows the camera inner memory size and how many frames will fit in.
If
‘Center’
check box is marked the application will compute the nearest offsets and
position ROI approximately at the center of the field of view. The new position will be
reflected in the grayed-out fields
‘Top’
and ‘
Left’
for the upper left corner of the ROI. To
change these fields and place ROI somewhere else, uncheck the
‘Center’
box.
Occasionally, the ROI size is too big for the selected frame rate and should be brought in
compliance for the capture to work. You will be warned if the image height is too large for