On-line image-on-image color registration control systems and methods based on time-scheduled control loop switching

Abstract

Color imaging methods and systems allow each color image to be registered in a composite manner. An image-on-image registration controller of an image forming device adjusts the control signals which control the output of image data to reduce or eliminate image registration offsets. In particular, two separate feedback loops are combined to monitor and adjust image registration without going off-line for a set-up procedure. These two feedback loops include a dynamic skew control feedback loop, which monitors and adjusts the edge position of the photoreceptor belt to infer lateral registration, and a direct image registration feedback loop, which monitors and adjusts relative image registration directly. The control signals are adjusted based on a determined image registration offset. The image processing device outputs an image based on the control signals adjusted based on a determined image registration offset. As the image's registration changes, the image-on-image registration controller determines and applies the necessary adjustments to the controls signals to keep the differently-colored images registered throughout the print run. The systems and methods permit many off-line set-up procedures the eliminated and increase the image quality by constantly adjusting for registration offsets.

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