User`s manual

AW00049313000 Spatial Correction on Color Cameras
Basler runner 137
9.2 Camera Operating Requirements for
Proper Spatial Correction
To achieve proper spatial correction, certain camera operating requirements should be met.
Line Acquisition
Line acquisition should be triggered by using the signals from a shaft encoder.
Use of the timed exposure control mode is strongly recommended to ensure uniform exposure.
The trigger width or trigger mode off exposure modes can be used but only if the conveyor speed
is 100% stable. If the conveyor speed is not stable, unacceptable variations in exposure time will
result.
IR Cut Filter
Because color filter arrays become transparent after 700 nm, use of a suitable IR cut filter is strongly
recommended to maintain spectral balance.
If an IR cut filter is not used, the colors in the acquired images may not match the colors in the
object. For example, a green color in the object may appear brown in the acquired image.
Lack of an IR cut filter can also result in very poor color separation. In some cases, acquired images
may appear to be almost monochrome because they do not provide enough color information to
produce a full color image.