Exposure Auto - Basler ace acA640-90gm User Manual

Standard Features
10.9.3

Exposure Auto

The exposure auto function will not work if the camera's exposure mode is set to
trigger width. For more information about the trigger width exposure mode, see
Section 7.4.3.2 on
Exposure Auto is the "automatic" counterpart to manually setting the Exposure Time Abs
parameter. The exposure auto function automatically adjusts the Exposure Time Abs parameter
value within set limits until a target average gray value for the pixel data from Auto Function AOI 1
is reached.
The exposure auto function can be operated in the "once" and continuous" modes of operation.
If Auto Function AOI 1 does not overlap the Image AOI (see the "Auto Function AOI" section) the
pixel data from Auto Function AOI 1 will not be used to control the exposure time. Instead, the
current manual setting of the Exposure Time Abs parameter value will control the exposure time.
The exposure auto function and the gain auto function can be used at the same time. In this case,
however, you must also set the auto function profile feature.
When trigger width exposure mode is selected, the exposure auto function is not available.
For more information setting the exposure time "manually", see Section 7.11 on
For more information about the trigger width exposure mode, see Figure 7.4.3.2.
For more information about the auto function profile feature, see Section 10.9.4 on
The limits within which the camera will adjust the Auto Exposure Time Abs parameter are defined
by the Auto Exposure Time Abs Upper Limit and the Auto Exposure Time Abs Lower Limit
parameters. The current minimum and the maximum allowed settings for the Auto Exposure Time
Abs Upper Limit parameter and the Auto Exposure Time Abs Lower Limit parameters depend on
the minimum allowed and maximum possible exposure time for your camera model.
The Auto Target Value parameter defines the target average gray value that the exposure auto
function will attempt to achieve when it is automatically adjusting the Exposure Time Abs value. The
target average gray value may range from 0 (black) to 255 (white) when the camera is set for an 8
bit pixel format or from 0 (black) to 4095 (white) when the camera is set for a 12 bit pixel format.
If the Auto Exposure Time Abs Upper Limit parameter is set to a sufficiently high
value the camera's frame rate may be decreased.
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