AW00123409000 Features
Basler ace USB 3.0 193
7.2 Gain
For information about the availability of the gain feature on a specific camera model, see Table 41
on page 191 and Table 42 on page 192. If your camera model is without gain, use the digital shift
feature to obtain a similar effect.
For more information about the digital shift feature, see Section 7.5 on page 202.
The camera’s gain feature allows to adjust
the camera’s gain. As shown in Figure 85,
increasing the gain increases the slope of
the response curve for the camera. This
results in a higher gray value output from
the camera for a given amount of output
from the imaging sensor. Decreasing the
gain decreases the slope of the response
curve and results in a lower gray value for a
given amount of sensor output.
Increasing the gain is useful when at your
brightest exposure, a gray value lower than
255 (in pixel formats that output 8 bits per
pixel) or 1023 (in pixel formats that output
10 bits per pixels) or 4095 (in pixel formats
that output 12 bits per pixels) is reached.
For example, if you found that at your
brightest exposure the gray values output
by the camera were no higher than 127 (in an 8 bit mode), you could increase the gain to 6 dB (an
amplification factor of 2) and thus reach gray values of 254.
7.2.1 Analog and Digital Control
Depending on the sensor and pixel format used, the mechanisms for Gain control can vary: For
some cameras, control is analog up to and including a certain boundary Gain parameter value [dB]
(see Table 43), above which Gain control is digital. For some cameras, Gain control is entirely
digital, for others entirely analog.
The boundary Gain parameter value is constant and independent of the chosen pixel format, of
whether the parameter limits for Gain are disabled, and of whether binning vertical is enabled.
For some camera models, the maximum allowed Gain parameter value decreases when a pixel
format with a higher bit depth is selected (see Table 44). Gain control is entirely analog if the
maximum allowed Gain parameter value falls below the boundary Gain parameter value.
0
0
100
0 db6dB12 dB
5025
4095 1023 255
Fig. 85: Gain in dB, Shown for 8 bit, 10 bit, and 12 bit Output
Gray Values
(12-bit)
(8-bit)
Sensor Output Signal (%)
(10-bit)
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