Linea HS Series Camera User's Manual Appendix B: Trouble Shooting Guide • 71
Smeared & Distorted Images
To achieve a well-defined image, the staggered sensor outputs are delayed in a manner that
matches the motion of the image across the sensor.
This synchronization is achieved by sending an external synchronization (EXSYNC) signal to the
module, where one pulse is generated when the object moves by the size of one object pixel. See
‘External Trigger Mode’ in the user manual.
Any transport motion that is not correctly reflected in the EXSYNC pulses will cause image
distortion in the scan direction.
The following subsections discuss causes of poor image quality resulting from the EXSYNC signal
not accurately reflecting the object motion.
Vertically Staggered Images
When accurate synchronization is not achieved, the image will have a vertical stagger in 682 pixels
sections in the scan direction.
If the EXSYNC pulses are coming too fast, then the image will appear stretched in the machine
direction. If the pulses are too slow, then the image will appear compressed.
Check the resolution of the encoder used to generate the EXSYNC pulses, along with the size of the
rollers, pulleys, gearing, etc. to ensure that one pulse is generated for one pixel size of travel of
the object. Use the exsync multiplier feature to adjust the pulses if the encoder cannot produce the
desired pixel size.
It is also important that the direction of image travel across the sensor is matched to the module’s
scan direction, as set by the user. See ‘Scan Direction’ in the user manual for more information.
If the scan direction is incorrect, then the image will have a significant staggered appearance and
in the scan direction. Changing the scan direction to the opposite direction should resolve this
problem.
Refer to the Camera Orientation section for more information on how to determine the correct
direction orientation for the camera.
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