ELECTRONIC BANDING COMPENSATION (EBC) OF HALFTONE-INTERACTION BANDING USING VARIABLE BEAM DELAYS

摘要

Disclosed are methods and systems for compensating for process direction banding associated with a document processing system including a ROS. According to one exemplary embodiment, a ROS driver uses a plurality of beam delay/advance values to compensate for banding caused by an interaction of a halftone pattern and process direction density variations associated with the ROS.

主权项

1. A raster output scanner (ROS) for generating an image on a portion of a light-receiving medium traveling along a process path past the ROS, the ROS comprising:
a plurality of light sources operative to generate a plurality of light outputs; a driver operatively associated with the plurality of light sources and operative to selectively actuate the plurality of light sources individually according to corresponding scan line image data to produce a corresponding plurality of modulated light outputs, the driver operatively associated with a memory storing a plurality of beam timing values corresponding to each of the plurality of light sources, the beam timing values set to compensate for banding caused by an interaction with a halftone pattern and process direction density variations associated with the ROS, each beam timing value associated with a cross-process direction delay or advancement of a respective light source, the driver configured to selectively actuate the plurality of light sources according to the corresponding beam timing values based on the scan line image data to produce the plurality of modulated light outputs; and a scanner that directs the modulated light outputs from the light sources toward a light receiving medium along the cross-process direction to generate an image on at least a portion of the light receiving medium, wherein the beam timing values associated with the halftone pattern provides one of reducing and minimizing the banding caused by the interaction with the halftone pattern.