System and method for modifying an output image signal to compensate for drum velocity variations in a laser printer
US5729277A · kind A · utility
14Cited by
3References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1995 |
| Grant date | Mar 17, 1998 |
| Priority date | — |
| Expiry date | Jul 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/4015
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.