公开(公告)号：BR9701105A

公开(公告)日：1998-09-08

申请号：BR9701105

申请日：1997-02-27

Applicant: XEROX CORP

Inventor： HARRINGTON STEVEN J ,  BENNETT SCOTT A ,  MALTZ MARTIN S

IPC: G06T1/00 ,  G06T1/20 ,  G06T11/00 ,  H04N1/46 ,  H04N1/60 ,  H04N1/024

Abstract: A method and apparatus for blending pictorial and graphical look-up tables, in which the blended look-up table, addressable by image signals from both pictorial and graphical objects, produces printer signals which are a blend of the output of the pictorial and graphical look-up tables. For image signals that are inside the pictorial gamut of the printer, only the output of the pictorial look-up table is used in the blended look-up table. For image signals that are outside the pictorial gamut, a blend of the output of both pictorial and graphical look-up tables is used in the blended look-up table. To blend the tables, graphical and pictorial image signals are selected from the surface of the graphical and pictorial gamut which have the same hue and luminance as the desired image signal. Printer signals output by both the graphical and pictorial look-up tables are weighted in accordance with the proportions of graphical and pictorial character container in the desired image signal, determined from the difference in saturation between the desired image signal and the selected graphical and pictorial image signals. The weighted printer signals are added and mapped to the desired image signal, the mapping being stored in an image signal translator.

公开(公告)号：DE69707172T2

公开(公告)日：2002-03-14

申请号：DE69707172

申请日：1997-02-20

Applicant: XEROX CORP

Inventor： MALTZ MARTIN S ,  HARRINGTON STEVEN J ,  BENNETT SCOTT A

IPC: G06T1/00 ,  G06T1/20 ,  G06T11/00 ,  H04N1/46 ,  H04N1/60

Abstract: A method and apparatus for blending pictorial and graphical look-up tables, in which the blended look-up table, addressable by image signals from both pictorial and graphical objects, produces printer signals which are a blend of the output of the pictorial and graphical look-up tables. For image signals that are inside the pictorial gamut of the printer, only the output of the pictorial look-up table is used in the blended look-up table. For image signals that are outside the pictorial gamut, a blend of the output of both pictorial and graphical look-up tables is used in the blended look-up table. To blend the tables, graphical and pictorial image signals are selected from the surface of the graphical and pictorial gamut which have the same hue and luminance as the desired image signal. Printer signals output by both the graphical and pictorial look-up tables are weighted in accordance with the proportions of graphical and pictorial character container in the desired image signal, determined from the difference in saturation between the desired image signal and the selected graphical and pictorial image signals. The weighted printer signals are added and mapped to the desired image signal, the mapping being stored in an image signal translator.

公开(公告)号：EP0793377A3

公开(公告)日：1998-09-02

申请号：EP97301104

申请日：1997-02-20

Applicant: XEROX CORP

Inventor： MALTZ MARTIN S ,  HARRINGTON STEVEN J ,  BENNETT SCOTT A

IPC: G06T1/00 ,  G06T1/20 ,  G06T11/00 ,  H04N1/46 ,  H04N1/60

CPC classification number: H04N1/6072 ,  H04N1/603 ,  H04N1/6058

Abstract: A method and apparatus for blending pictorial and graphical look-up tables, in which the blended look-up table, addressable by image signals from both pictorial and graphical objects, produces printer signals which are a blend of the output of the pictorial and graphical look-up tables. For image signals that are inside the pictorial gamut of the printer, only the output of the pictorial look-up table is used in the blended look-up table. For image signals that are outside the pictorial gamut, a blend of the output of both pictorial and graphical look-up tables is used in the blended look-up table. To blend the tables, graphical and pictorial image signals are selected from the surface of the graphical and pictorial gamut which have the same hue and luminance as the desired image signal. Printer signals output by both the graphical and pictorial look-up tables are weighted in accordance with the proportions of graphical and pictorial character container in the desired image signal, determined from the difference in saturation between the desired image signal and the selected graphical and pictorial image signals. The weighted printer signals are added and mapped to the desired image signal, the mapping being stored in an image signal translator.

公开(公告)号：DE60131613D1

公开(公告)日：2008-01-10

申请号：DE60131613

申请日：2001-09-06

Applicant: XEROX CORP

Inventor： BAI YINGJUN ,  BENNETT SCOTT A

IPC: B41J2/52 ,  H04N1/40 ,  B41J2/525 ,  G06T5/00 ,  G06T7/00 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60

Abstract: Techniques for black and white pattern rendering that increase processing speed and reduce memory requirements while providing improved pattern selection performance are provided. The hue angle and lightness of a color input are determined (S130,S190). The hue angle is used to index into a lookup table of halftone functions that specify default frequency and spot functions for a hue angle range. For each selected halftone, the determined hue angle is substituted from the hue angle range if the determined hue angle differs from the last determined hue angle range by more than a threshold difference value. The determined lightness is used to determine the halftoning threshold value and rendering then occurs.

公开(公告)号：BR0104007A

公开(公告)日：2002-05-07

申请号：BR0104007

申请日：2001-09-12

Applicant: XEROX CORP

Inventor： BAI YINGJUN ,  BENNETT SCOTT A

IPC: B41J2/52 ,  B41J2/525 ,  G06T5/00 ,  G06T7/00 ,  H04N1/40 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60

Abstract: Techniques for black and white pattern rendering that increase processing speed and reduce memory requirements while providing improved pattern selection performance are provided. The hue angle and lightness of a color input are determined (S130,S190). The hue angle is used to index into a lookup table of halftone functions that specify default frequency and spot functions for a hue angle range. For each selected halftone, the determined hue angle is substituted from the hue angle range if the determined hue angle differs from the last determined hue angle range by more than a threshold difference value. The determined lightness is used to determine the halftoning threshold value and rendering then occurs.

公开(公告)号：DE69707172D1

公开(公告)日：2001-11-15

申请号：DE69707172

申请日：1997-02-20

Applicant: XEROX CORP

Inventor： MALTZ MARTIN S ,  HARRINGTON STEVEN J ,  BENNETT SCOTT A

IPC: G06T1/00 ,  G06T1/20 ,  G06T11/00 ,  H04N1/46 ,  H04N1/60

Abstract: A method and apparatus for blending pictorial and graphical look-up tables, in which the blended look-up table, addressable by image signals from both pictorial and graphical objects, produces printer signals which are a blend of the output of the pictorial and graphical look-up tables. For image signals that are inside the pictorial gamut of the printer, only the output of the pictorial look-up table is used in the blended look-up table. For image signals that are outside the pictorial gamut, a blend of the output of both pictorial and graphical look-up tables is used in the blended look-up table. To blend the tables, graphical and pictorial image signals are selected from the surface of the graphical and pictorial gamut which have the same hue and luminance as the desired image signal. Printer signals output by both the graphical and pictorial look-up tables are weighted in accordance with the proportions of graphical and pictorial character container in the desired image signal, determined from the difference in saturation between the desired image signal and the selected graphical and pictorial image signals. The weighted printer signals are added and mapped to the desired image signal, the mapping being stored in an image signal translator.

公开(公告)号：DE60131613T2

公开(公告)日：2008-10-23

申请号：DE60131613

申请日：2001-09-06

Applicant: XEROX CORP

Inventor： BAI YINGJUN ,  BENNETT SCOTT A

IPC: B41J2/52 ,  H04N1/40 ,  B41J2/525 ,  G06T5/00 ,  G06T7/00 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60

Abstract: Techniques for black and white pattern rendering that increase processing speed and reduce memory requirements while providing improved pattern selection performance are provided. The hue angle and lightness of a color input are determined (S130,S190). The hue angle is used to index into a lookup table of halftone functions that specify default frequency and spot functions for a hue angle range. For each selected halftone, the determined hue angle is substituted from the hue angle range if the determined hue angle differs from the last determined hue angle range by more than a threshold difference value. The determined lightness is used to determine the halftoning threshold value and rendering then occurs.

公开(公告)号：CA2356813C

公开(公告)日：2005-02-01

申请号：CA2356813

申请日：2001-09-10

Applicant: XEROX CORP

Inventor： BAI YINGJUN ,  BENNETT SCOTT A

IPC: B41J2/52 ,  B41J2/525 ,  G06T5/00 ,  G06T7/00 ,  H04N1/40 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60 ,  H04N1/405

Abstract: Techniques for black and white pattern rendering that increase processi ng speed and reduce memory requirements while providing improved pattern selection performance are provided. The hue angle and lightness of a color input are determined. The hue angle is used to index into a lookup table of halftone functions that specify default frequency and spot functions for a hue angle range. For each selected halftone, the determined hue angle is substituted from the hue angl e range if the determined hue angle differs from the last determined hue angle range by more than a threshold difference value. The determined lightness is used to determine the halftoning threshold value and rendering then occurs.

公开(公告)号：CA2356813A1

公开(公告)日：2002-03-12

申请号：CA2356813

申请日：2001-09-10

Applicant: XEROX CORP

Inventor： BAI YINGJUN ,  BENNETT SCOTT A

IPC: B41J2/52 ,  B41J2/525 ,  G06T5/00 ,  G06T7/00 ,  H04N1/40 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60 ,  H04N1/405

Abstract: Techniques for black and white pattern rendering that increase processi ng speed and reduce memory requirements while providing improved pattern selection performance are provided. The hue angle and lightness of a color input are determined. The hue angle is used to index into a lookup table of halftone functions that specify default frequency and spot functions for a hue angle range. For each selected halftone, the determined hue angle is substituted from the hue angl e range if the determined hue angle differs from the last determined hue angle range by more than a threshold difference value. The determined lightness is used to determine the halftoning threshold value and rendering then occurs.

公开(公告)号：JP2002142121A

公开(公告)日：2002-05-17

申请号：JP2001262587

申请日：2001-08-31

Applicant: XEROX CORP

Inventor： BAI YINGJUN ,  BENNETT SCOTT A

IPC: B41J2/52 ,  B41J2/525 ,  G06T5/00 ,  G06T7/00 ,  H04N1/40 ,  H04N1/46 ,  H04N1/52 ,  H04N1/60

Abstract: PROBLEM TO BE SOLVED: To provide a system and a method for representing patterns in substitution for colors for representing colors by a monochrome system. SOLUTION: The pattern representation system 100 comprises a brightness determination circuit 110, a brightness look-up table memory 112, a gray color determination circuit 120, a hue angle determination circuit 130, a memory 140 for storing the hue angle previously used, a half-tone screen angle setting circuit 150, a half-tone look-up table 160, a candidate half-tone selection circuit 170, a gray or half-tone setting circuit 180 and a representation circuit 190.