公开(公告)号：CA2434633A1

公开(公告)日：2004-01-16

申请号：CA2434633

申请日：2003-07-08

Applicant: XEROX CORP

Inventor： SKINNER GARY W ,  MESTHA LALIT K ,  CREAN PETER A ,  BREWINGTON GRACE T

IPC: G06F3/12 ,  G06T5/00 ,  H04N1/40 ,  H04N1/405 ,  H04N1/407 ,  H04N1/60 ,  G03G13/00

Abstract: In an image rendering system, a method of compensating for system performance changes related to image attributes includes rendering a diagnostic image, sensing at least one image quality from the diagnostic image, updatin g an image attribute compensation tone reproduction curve based on the sensed ima ge quality and rendering an image based on the updated image attribute compensation tone reproduction curve. For example, image attributes include print media type and a halftone screen selection. An image processing system operative to perform the method of compensation includes a set of image attribute compensation tone reproduction curves. Each curve of the set is associated with a particular combination of image attributes. For example, each curve is associated with a particular media type/halftone screen combination.

公开(公告)号：CA2409590A1

公开(公告)日：2003-04-30

申请号：CA2409590

申请日：2002-10-24

Applicant: XEROX CORP

Inventor： MESTHA LALIT K ,  WANG YAO RONG ,  MIHALYOV KENNETH J

IPC: G01J3/46 ,  G03G15/00 ,  G03G15/01 ,  G06T1/00 ,  H04N1/46 ,  H04N1/60 ,  G05D25/00 ,  G03G21/00 ,  G03G13/01 ,  B41J2/525

Abstract: A color sensor monitors the output of a color producing process and produc es a signal representative of a color produced by the color producing process. The signal can be used as feedback signal to control the process. Occasionally, the col or sensor signal includes a component representing a transient error. A system model o f the color producing process is used to predict reasonable sensor signals. A comparison of the sensor signal with the predicted sensor signals is used to determine if the sensor signal is reasonable. If the sensor signal is unreasonable, a substitute signal is used as the feedback signal to the control process. The substitute signal can be a predicted sensor signal or a signal based on historical system performance data. 19

公开(公告)号：BR0201882A

公开(公告)日：2003-03-11

申请号：BR0201882

申请日：2002-05-21

Applicant: XEROX CORP

Inventor： TANDON JAGDISH C ,  MESTHA LALIT K

IPC: G01J3/46 ,  G01J1/02 ,  G01J1/06 ,  G01J1/42 ,  G01J3/02 ,  G01J3/51 ,  G01J3/52 ,  G03G15/01 ,  H04N1/60 ,  H01L27/146

公开(公告)号：GB2486947A

公开(公告)日：2012-07-04

申请号：GB201121249

申请日：2011-12-12

Applicant: XEROX CORP

Inventor： WANG YAO RONG ,  FAN ZHIGANG ,  MESTHA LALIT K

IPC: G06T7/00 ,  G06K9/00 ,  H04N5/33

Abstract: The invention is directed to systems and methods which use an infrared camera system to obtain a multiband IR image and then determine the total number of people in that image. The multiband image can be captured by either a sequentially illuminating multiband infrared source with a broad filter at the camera or a broad one band illuminating source with multi band pass filters at the camera. A total of N intensity values are collected for each pixel in an IR image to be processed for human determination. The pixel intensity values are then processed to determine a ratio of the intensity pixel values from which is derived a threshold. Each intensity value is then compared to this threshold and based on the result classified as living or non-living and from these classifications the number people in the image is determined. The IR image may be of a moving vehicle in a high occupancy vehicle (HOV) lane and may be motion corrected.

公开(公告)号：DE60239571D1

公开(公告)日：2011-05-05

申请号：DE60239571

申请日：2002-08-30

Applicant: XEROX CORP

Inventor： MESTHA LALIT K ,  DIANAT SOHAIL A

IPC: G01J3/28 ,  G01J3/46 ,  G01J3/52

公开(公告)号：CA2409590C

公开(公告)日：2010-05-25

申请号：CA2409590

申请日：2002-10-24

Applicant: XEROX CORP

Inventor： MESTHA LALIT K ,  WANG YAO RONG ,  MIHALYOV KENNETH J

IPC: G01J3/46 ,  B41J2/525 ,  G03G13/01 ,  G03G15/00 ,  G03G15/01 ,  G03G21/00 ,  G05D25/00 ,  G06T1/00 ,  H04N1/46 ,  H04N1/60

Abstract: A color sensor monitors the output of a color producing process and produces a signal representative of a color produced by the color producing process. The signal can be used as feedback signal to control the process. Occasionally, the color sensor signal includes a component representing a transient error. A system model of the color producing process is used to predict reasonable sensor signals. A comparison of the sensor signal with the predicted sensor signals is used to determine if the sensor signal is reasonable. If the sensor signal is unreasonable, a substitute signal is used as the feedback signal to the control process. The substitute signal can be a predicted sensor signal or a signal based on historical system performance data. 19

公开(公告)号：CA2434633C

公开(公告)日：2009-10-06

申请号：CA2434633

申请日：2003-07-08

Applicant: XEROX CORP

Inventor： CREAN PETER A ,  SKINNER GARY W ,  MESTHA LALIT K ,  BREWINGTON GRACE T

IPC: G06F3/12 ,  G06T5/00 ,  G03G13/00 ,  H04N1/40 ,  H04N1/405 ,  H04N1/407 ,  H04N1/60

Abstract: In an image rendering system, a method of compensating for system performance changes related to image attributes includes rendering a diagnostic image, sensing at least one image quality from the diagnostic image, updatin g an image attribute compensation tone reproduction curve based on the sensed ima ge quality and rendering an image based on the updated image attribute compensation tone reproduction curve. For example, image attributes include print media type and a halftone screen selection. An image processing system operative to perform the method of compensation includes a set of image attribute compensation tone reproduction curves. Each curve of the set is associated with a particular combination of image attributes. For example, each curve is associated with a particular media type/halftone screen combination.

公开(公告)号：DE60227761D1

公开(公告)日：2008-09-04

申请号：DE60227761

申请日：2002-10-31

Applicant: XEROX CORP

Inventor： MESTHA LALIT K ,  SABER ELI S

IPC: G01N21/27 ,  H04N1/60 ,  G01N21/47 ,  G03G15/01

Abstract: A multiple-LED sensor is used to detect area coverage of marked patches on a marking substrate. The same sensor may also be used for color calibration. The marking substrate area coverage sensor obtains reflectance measurements from marked patches of a marking substrate. For example, the marked patches may be patches of a marking substance such as toner, ink or paint, or patches marked by etching or the like. A Neugebauer model may be used to obtain the reflectance measurements. A batch least squares algorithm may be used to estimate the appropriate parameters of the Neugebauer model. For improved accuracy, a recursive least squares algorithm may be used. The recursive least squares algorithm allows the marking substrate area coverage sensor to calibrate itself to changes in the sensing environment.

公开(公告)号：BRPI0506025A

公开(公告)日：2006-09-19

申请号：BRPI0506025

申请日：2005-12-22

Applicant: XEROX CORP

Inventor： HUBBLE FRED F III ,  LOVE TONYA L ,  MESTHA LALIT K ,  ROBBINS DANIEL A

IPC: G01N21/31

公开(公告)号：CA2504545A1

公开(公告)日：2005-10-27

申请号：CA2504545

申请日：2005-04-20

Applicant: XEROX CORP

Inventor： MESTHA LALIT K ,  BOLTE STEVEN B ,  TANDON JAGDISH C

IPC: G01J3/10 ,  G01J3/50 ,  G01J3/46