Xerox Corporation

John L Zanghi

Timothy M Hunter

David Birnbaum

Hung M Pham

Joseph Chiang

The present invention is a method and apparatus for automatically monitoring the output intensity of an analog raster output scanning (ROS) system. The invention further includes the ability to recognize when the output intensity is not within a predetermined tolerance range, where the system will automatically recalibrate to achieve a desired linear transformation from the input image greyscale intensity to the ROS exposure intensity.

Method and apparatus for the automatic calibration of an analog raster

An apparatus and method of reducing pixel clock jitter in a raster scanner having a oscillator which generates a pixel clock signal and a start of scan sensor for generating a start of scan signal, includes the generation of an inverted pixel clock signal and an inverted start of scan signal. Based on which of the pixel clock signal or the inverted pixel clock signal has a rising edge closer to the start of scan signal, one of the pixel clock or inverted pixel clock signal is selected to replace the original pixel clock signal. Further selections are prevented from occurring until a subsequent start of scan signal is detected.

Growing community of inventors

Rochester, NY, United States of America

John L Zanghi