Setting Up An Aoi List - Basler A400K User Manual

Basic Operation and Features

3.8.4.1 Setting Up an AOI List

The AOI list defines the areas of interest to be run. For each area of interest, you define an
exposure time and delay time. You also define the number of times you want to run the area of
interest within the sequence and whether you want the flash trigger signal to be enabled. The
order in which the areas of interest are run is determined by their position in the list. The area of
interest in the first position is performed first, the area of interest in second position is performed
second, and so on. Up to 32 areas of interest can be defined. After the last area of interest in the
list has been run, the sequence restarts with the first area of interest, and so on.
Figure 3-13 shows an AOI list that defines five areas of interest. In the AOI list, values of the
starting columns must be entered as the value of the actual starting column minus one. The first
area of interest's starting column is 1 (the entry is 1-1= 0), the width is 1024 pixels, the starting
line is 100 and the height in lines is 500. This area of interest will be captured using an exposure
time of 600 * 4.56 µs. Exposure of the second area of interest will start 3000 * 4.56 µs after
exposure of the first area of interest. The first area of interest will be run once, then the area of
interest in second position will follow. For the first area of interest, the flash trigger signal will be
enabled.
The second area of interest's starting column is 161 (the entry is 161-1=160), the width is 512
pixels, the starting line is 600 and the height in lines is 300. The second area of interest will be run
three times with a delay of 2000 * 4.5 µs between each exposure. The third area of interest will be
run 2000 * 4.5 µs after the last exposure for the second area of interest. For the second area of
interest, the flash trigger signal will be disabled.
The areas of interest in third, fourth and fifth position are run once each. Then, the sequence is
repeated starting with the area of interest in first position, and so on.
(1) 0
(2) 160
(3) 160
(4) 800
(5) 0
Position
AOI
Starting Column
Figure 3-13: AOI List
When setting up the AOI list, a few guidelines must be observed:
• When the AOI sequencer feature is enabled, global area of interest, exposure time, frame
period and parameter set cache parameter settings have no effect on the image. If global
area of interest, exposure time, frame period and/or parameter set cache parameter settings
are modified while the AOI sequencer feature is active, the modifications will be saved but
will only become active after the AOI sequencer feature is disabled.
• The area of interest setup guidelines described in Section
3-28
DRAFT
1024 100 500
512 600 300
512 600 300
1552 321 1406
2352 1 1726
AOI Width AOI Height
AOI
Starting Line
600 3000 1
400 2000 3
400 2000 1
1500 8000 1
1800 10000 1
Delay
Time
Exposure Runs
Time
3.8.1
1
0
1
1
0
Flash
Trigger
must be observed.
Basler A400k