System and method for modifying an output image signal to compen

Details System and method for modifying an output image signal to compen System and method for modifying an output image signal to compen

1995-07-19

1998-03-17

Reinhart, Mark J.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347234, B41J 247

Patent

active

057292779

ABSTRACT:
A system and method of correcting aberrations in an output image of an image transfer apparatus, the aberrations being due to variations in a velocity of a scanning surface in the image transfer apparatus. Specifically, laser printer banding effects are reduced by modifying the gray scale dithering concentration based on a sensed variation of drum rotation velocity. A closed loop feedback system monitors errors in the drum motion and compensates the modulation of the laser to help cancel out the perceivable amount of banding effect in the printed image.

REFERENCES:
patent: 4613877 (1986-09-01), Spencer et al.
patent: 4761662 (1988-08-01), Yoshimoto et al.
patent: 4893135 (1990-01-01), Jamzadeh

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