| Patent Number |
Title Of Patent |
Date Issued |
| 7552986 |
Systems and methods for reducing process direction registration errors of a printhead using a li |
June 30, 2009 |
| Systems and methods are provided for detecting process direction registration errors in a printer. The errors are detected by analyzing a metric of a dash minimum response obtained from a test pattern. The test pattern contains dashes. At least one dash is shifted in the process dire |
| 7543911 |
Systems and methods for reducing cross process direction registration errors of a printhead usin |
June 9, 2009 |
| Systems and methods are provided for determining registration errors in the cross process direction of a printer. A first straight line is obtained by detecting line centers of a first plurality of dashes in a test pattern. A second straight line is obtained by detecting a line cente |
| 7492485 |
Image-based compensation and control of photoreceptor ghosting defect |
February 17, 2009 |
| A system and method for correcting a defect in an image, such as a ghost defect or a reload defect, by compensating for the defect. A defect model is created with a source target function that represents a source level with respect to a target level. A test output image is created on whi |
| 7492381 |
Compensation of MPA polygon once around with exposure modulation |
February 17, 2009 |
| Many xerographic machines have a motor polygon assembly (MPA), which is a rotating polygonal mirror. As the MPA rotates, it reflects a modulated light beam to produce scan lines on a photoreceptor. Inconsistencies in the MPA can cause inconsistencies in the scan lines, and therefore |
| 7325899 |
Real-time interlace adjustment based on predicted image quality |
February 5, 2008 |
| Systems and methods of marking control achieve improved image quality in a multipass marking process by taking into account positioning errors that have already occurred in prior marking passes while building the image, and compensates for them in real-time by modifying the remaining |
| 7313337 |
Method and apparatus for sensing and controlling residual mass on customer images |
December 25, 2007 |
| Disclosed is a method and apparatus for sensing residual toner mass after transfer of a xerographic image, to facilitate the identification and characterization of different types of transfer defects. The technique employed utilizes a nominal residual mass signature, measured at the |
| 7309118 |
Systems and methods for reducing cross process direction registration errors of a printhead usin |
December 18, 2007 |
| Systems and methods are provided for determining registration errors in the cross process direction of a printer. A first straight line is obtained by detecting line centers of a first plurality of dashes in a test pattern. A second straight line is obtained by detecting a line cente |
| 7283240 |
Spectrophotometer target distance variation compensation |
October 16, 2007 |
| Spectrophotometer color measurement with a target illumination system and a reflected illumination sensing system where the target surface is variably spaced from said spectrophotometer. Color correction calibration information corresponding to color measurements for known different |
| 7271910 |
Systems and methods for compensating for temperature induced spectral emission variations in LED |
September 18, 2007 |
| Systems and method provide compensation for temperature induced peak wavelength shift of LEDs is color parameter measuring systems that use a model to reconstruct target color parameter values from the reflectance values measured when the target is illuminated by LEDs. Several models |
| 7256411 |
Systems and methods for improving calibration of a linear array sensor |
August 14, 2007 |
| Systems and methods provide calibration for a linear array sensor. A test pattern having a plurality of lines is used. Comparison between expected and measured spacing between a pair of neighboring lines is used to determine sensor position displacement. |
| 7236711 |
Full-width array sensing of two-dimensional residual mass structure to enable mitigation of spec |
June 26, 2007 |
| A defect analysis system for a xerographic print engine includes a residual mass sensor that senses the two-dimensional signature structure of residual mass remaining on a photoconductive or other substrate surface after image transfer. Preferably, the sensor is a full width array th |
| 7193638 |
Systems and methods for sensing skew and bow of a raster optical scanner using a full width arra |
March 20, 2007 |
| System and methods are provided for detecting color separation misalignment in raster optical scanners. A dash minimum response curve is obtained from a plurality of minimal responses sensed from a plurality of dashes in a test pattern. The frequency of the dash minimum response curv |
| 7154110 |
Systems and methods for improving calibration of a linear array sensor |
December 26, 2006 |
| Systems and methods provide calibration for a linear array sensor. A test pattern having a plurality of lines is used. Comparison between expected and measured spacing between a pair of neighboring lines is used to determine sensor position displacement. |
| 6457651 |
Dual mode, dual information, document bar coding and reading system |
October 1, 2002 |
| A dual level encryption method, and document, for providing and obtaining a substantially increased amount of optically readable information from an otherwise conventional and highly visible printed bar code pattern area on a document without interfering with the conventional optical rea |
