Auto Functions; Common Characteristics - Basler acA2040-55 User Manual

Features

7.15 Auto Functions

7.15.1 Common Characteristics

Auto functions control image properties and are generally the "automatic" counterparts of certain
features such as the gain feature or the white balance feature, which normally require "manually"
setting the related parameter values. Auto functions are particularly useful when an image property
must be adjusted quickly to achieve a specific target value and when a specific target value must
be kept constant in a series of images.
An Auto Function Region of Interest (Auto Function ROI) lets you designate a specific part of the
image as the base for adjusting an image property. Each auto function uses the pixel data from an
Auto Function ROI for automatically adjusting a parameter value and, accordingly, for controlling
the related image property. Some auto functions use their own individual Auto Function ROI and
some auto functions share a single Auto Function ROI.
An auto function automatically adjusts a parameter value until the related image property reaches
a target value. Note that the manual setting of the parameter value is not preserved. For example,
when the Gain Auto function adjusts the gain parameter value, the manually set gain parameter
value is not preserved.
For some auto functions, the target value is fixed. For other auto functions, the target value can be
set, as can the limits between which the related parameter value will be automatically adjusted. For
example, the gain auto function lets you set an average gray value for the image as a target value
and also set a lower and an upper limit for the gain parameter value.
Generally, the different auto functions can operate at the same time. For more information, see the
following sections describing the individual auto functions.
A target value for an image property can only be reached, if it is in accord with all
pertinent camera settings and with the general circumstances used for capturing
images. Otherwise, the target value will only be approached.
For example, with a short exposure time, insufficient illumination, and a low setting
for the upper limit of the gain parameter value, the Gain Auto function may not be
able to achieve the current target average gray value setting for the image.
You can use an auto function when binning is enabled (monochrome cameras and
the acA1920-25uc only). An auto function uses the binned pixel data and controls
the image property of the binned image.
For more information about binning, see Section 7.8 on
294
page 245.
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