User`s manual

Basic Operation & Standard Features
3-22 BASLER A620
f
DRAFT
3.7.1 Changing AOI Parameters “On-the-Fly”
Making AOI parameter changes “on-the-fly” means making the parameter changes while the
camera is capturing images continuously. On-the-fly changes are only allowed for the parameters
that determine the position of the AOI, i.e., the parameters for Top and Left. Changes to the AOI
size are not allowed on-the-fly.
The camera’s response to an on-the-fly change in the AOI position will take effect on the next
trigger after the changes are received by the camera.
3.7.2 Changes to the Frame Rate With AOI
In general, the maximum frame rate for A620f cameras increases as the size of the AOI
decreases. However, the maximum frame rate can also be limited by three factors:
• The exposure time plus the amount of time it takes to read out a captured image from the
image sensor to the frame buffer.
• The amount of time it takes to transmit an image from the frame buffer to the PC via the
IEEE 1394 bus.
• Whether the camera is set for an 8 bit output mode or for a 16 bit output mode.
The descriptions on the next two pages illustrate how to determine the maximum allowed frame
rate when your camera is set for 8 bit output and when it is set for 16 bit output.
L
The sum of the setting for Left plus the setting for Width must not exceed 1280.
The sum of the setting for Top plus the setting for Height must not exceed 1024.
The setting for the Starting Column must be zero or a multiple of 4, i.e., 0, 4, 8, 12,
etc.
The setting for the Width must be a multiple of 4, i.e., 4, 8, 12, 16, etc.