Xerox Corporation

Shahriar Vazan

Robert P Loce

Michael Branciforte

Russell B Rauch

Girmay K Girmay

Abraham E Claproth

James F Oathout

An electro-optical system for adjusting beam to beam power non-uniformity in a multi-beam scanning system is disclosed. The electro-optical system consists of N&#xd7;M array of light beams and N&#xd7;M array of photodetectors wherein optical means deflect the light beams onto a photodetector array. A circuit consisting of N&#xd7;M array of programmable laser drivers programmed with uniformity values for each light beam and having an N&#xd7;M array of feedback loops is used to adjust the power intensity of each beam through the programmable laser drivers wherein each programmable laser driver uses the photodetector array summed with non-linearity inputs to adjust for beam to beam power uniformity correction.

Parallel beam to beam power correction

Uniformity of light output from an LED printbar is achieved by current sensing or image sensing of auxiliary LEDs on the LED printbar. A photodetector measures the light output from the auxiliary LEDs and a comparator will compare the auxiliary LED data to determine if the entire LED printbar has to be compensated to make the light output more uniform.

Adaptive light emitting diode bar equalization

The present invention is a method and apparatus for logic based resolution conversion of digital images. The invention employs an interlocked area mapping technique to provide one or more resolution converted bit planes of digital image data. The system has particular use in highlight color systems, wherein the highlight color data may be processed separately for each color plane, using the present invention, and then recombined to produce enhanced highlight color output.

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Northridge, CA, United States of America

Shahriar Vazan