User`s manual

Basic Operation & Standard Features
3-20
BASLER A600f
DRAFT
3.6.2 Changes to the Frame Rate With AOI
In general, the maximum frame rate for A602f cameras increases as the size of the AOI
decreases. However, the maximum frame rate can also be limited by any one of three factors:
• The amount of time it takes to transfer a captured image from the image sensor to the
frame buffer.
• The amount of time it takes to transfer an image from the frame buffer to the PC via the
IEEE 1394 bus.
• The exposure time setting.
To determine the maximum frame rate for a given AOI, use your AOI and exposure time settings
to calculate a result in each of the three formulas below. These formulas take your AOI size into
account plus the other factors that can limit the frame rate. The formula that returns the lowest
value will determine the maximum frame rate for the given AOI.
Formula 1:
Formula 2:
Formula 3:
L
This section applies to A602f cameras only. On A601f cameras, the maximum frame
rate is 60 frames per second in 8 bit output modes or 30 frames per second in 16
bit output modes and does not increase when the AOI feature is used.
These formulas assume that the camera is being operated in an 8 bit output mode.
If the camera is operating in a 16 bit output mode (such as YUV 4:2:2), the maxi-
mum frame rate will be one half of the rate calculated with the formulas.
Max. Frames/s
1
AOI Height 2+
()15.28 µs×[]15.28 µs+
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Max. Frames/s
1
Packets/frame 125 µs
×
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Max. Frames/s
1
Exposure Time in µs + 28 µs
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