Linea HS Series Camera User's Manual Camera Features • 37
Adjusting Responsivity and Contrast Enhancement
See the section Camera Control Category in Appendix A for GenICam features associated with this
section and how to use them.
Related Features: GainSelector, systemGain, BlackLevel
It is best for module performance to always use the maximum exposure time possible based on the
maximum line rate of the inspection system and any margin that may be required to accommodate
illumination degradation. However, it will be necessary to adjust the responsivity to achieve the
desired output level from the module. The module has row gain and black level (offset) features
that can be used to adjust the module’s responsivity.
Gain and black level settings are applied as follows:
DN
out
= ((DN
in
+ Black Level) * Row Gain) * System Gain
Figure 12: Black Level, Row Gain and System Gain Processing Chain
Row gain adjustment can be applied to all sensor array output rows or selectively each row; If the
Exposure Mode is Timed, only one row is available. In Dual exposure, two rows are available where
each can have a separate row gain values. Row gains can be adjusted from 1 to 4.99x. System
Gain can be adjusted from 1 to 9.99x.
When an image contains no useful dark image data below a specific threshold, then it may be
beneficial to increase the contrast of the image.
Black Level
The module has a black level (offset) feature that allows a specified level to be added or subtracted
from the image data.
Negative values can be used to eliminate dark areas of no interest. The gain feature can then be
used to return the peak image data to near output saturation with the result being increased image
contrast. First, determine the offset value to subtract from the image with the current gain setting.
Then set this as a negative offset value and apply additional gain to achieve the desired peak
image data values.
Positive values can be used to eliminate black clipping of image data. This can be useful when
measuring dark noise performance.
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