46
•
Camera Performance and Features
Linea HS Multifield Camera
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: Gain Selector, Gain, Offset
It is best for camera 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 from the camera. The camera has a gain feature that can be used to adjust the
camera’s responsivity.
Gain adjustment is available to independently adjust each line or all of them together. System Gain
can be adjusted from 1x to 10x. Individual line gains can be adjusted from 1x to 4x.
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.
The camera has an offset feature that allows a specified level to be subtracted from the image
data. 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 you need to subtract from the image with the current gain setting
you are using. Then set this as a negative offset value and apply additional gain to achieve the
desired peak image data values.
Note: A positive offset value is not useful for contrast enhancement. However, it can be
used while measuring the dark noise level of the camera to ensure zero clipping is not
present.
