User guide

LBA-USB User Guide Document No: 11294 Page 41
Set a Custom ROI (Region of Interest)
(LBA-USB-SP specific)
Select this Format option to either further reduce the amount of data collected
(thus allowing for faster frame capture rates) or to focus in on a specific region
of interest. The format x and y Offsets and Width/Height settings from the
previous selection are retained as the starting point for the custom ROI.
To set a custom ROI, modify the x and y Offsets to establish the new location
of the top left pixel of the ROI. Next, define the size of the ROI in pixels by
Width and Height. Finally, select an appropriate Frame Rate calculated for
the application. The available rates are dependent on the size of the region, the
pixel format, and the shutter setting.
Note: Not all SP style cameras have the ability to create a custom ROI format. Some
early release SP620 cameras will have this capability added at a later date.
Consult with the Ophir-Spiricon Service department for availability.
Frame Rate (LBA-USB-SP specific)
The available Frame Rate settings (in Hertz) are determined by the size of the
region, the pixel format, and the packet size (speed). The final running rate is
displayed in the bottom status bar of the LBA-USB-SP display and may be slower
the rate selected depending upon system overhead and results computation
loading.
Pixel Bits (LBA-USB-SP specific)
This is a display and not a control item. The number of bits per pixel is displayed
here.
External Trigger Input
(LBA-USB-SP specific)
An external trigger enables the camera to be synchronized with an external
source. Triggers are defaulted as rising edge sensitive but a Falling edge option
is selectable. Trigger input pulses should only be connected to 3.3V or LVTTL
digital logic signal. The inputs are 5 Volt tolerant but higher voltages may cause
damage to the camera.
A standard BNC input jack serves both the Trigger In and Stobe Out functions.
If an external input trigger is attached to the camera, activate the External
Trigger Input option as shown above. The Exposure starts upon receipt of the
trigger pulse unless the exposure Input Delay is set to a non-ZERO value. The
Input Delay sets the time interval between the moment when the trigger is
received and the moment when the exposure begins.