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1.发明公开Subpixel character positioning with antialiasing with grey masking techniques 失效Anti-Alias-Unterpixel-Zeichenpositionierung mit Grauwertmaskierungstechniken
公开(公告)号：EP0814431A2
公开(公告)日：1997-12-29
申请号：EP97304175
申请日：1997-06-16
Applicant: XEROX CORP
Inventor： HARRINGTON STEVEN J , KLASSEN R VICTOR
CPC classification number: G06T5/20 , G06T5/50 , G06T2200/12
Abstract: A method for combining foreground objects defined by a mask value and shade value, with a background image defined by a shade value, using high resolution edge information derived from low resolution grey image representations. By treating the object edge pixels in a high resolution grey model, characteristics of an edge represented by an edge pixel can be approximated by reference to surrounding grey elements. Movement of the edge can be approximated by changing the mask values in the high resolution grey model. Changes in the overall grey level of the pixel resulting from the mask changes cause the impression of edge movement in the low resolution edge.
Abstract translation: 使用由低分辨率灰度图像表示导出的高分辨率边缘信息，将由掩模值和阴影值定义的前景对象与由阴影值定义的背景图像组合的方法。 通过以高分辨率灰色模型处理对象边缘像素，可以通过参考周围的灰色元素近似由边缘像素表示的边缘的特征。 可以通过改变高分辨率灰色模型中的掩码值来近似移动边缘。 由掩模变化导致的像素的总体灰度级的变化导致在低分辨率边缘中的边缘移动的印象。
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2.发明公开Blended look-up table for printing images with both pictorial and graphical elements 失效含有混合查找表用于打印图像，图像和图形元素
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
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.
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公开(公告)号：EP0774860A3
公开(公告)日：1998-07-22
申请号：EP96308221
申请日：1996-11-14
Applicant: XEROX CORP
Inventor： HARRINGTON STEVEN J
CPC classification number: H04N1/52
Abstract: An image processing system, and method, for a multicolor printer, including a halftone generator that converts contone separation signals to binary separation signals. Halftone screens are generated for each separation in accordance with the goal of avoiding overlapping whenever possible. Initially, the black separation is halftoned, generating a dot pattern with a number of ON (K) pixels and OFF pixels in accordance with the area density of the black separation. Next, a first color (MAGENTA) separation is halftoned, setting a number of the previous OFF pixels to ON. Then, if any white pixels remain, a second color (CYAN) separation is halftoned, setting a number of the previously OFF pixels to ON. If during the processing of the second and third separations, it is determined that no OFF pixels exist to be turned ON, a second layer of color is started, respectively superimposed over the first layer. A third color separation (YELLOW) is halftoned in reverse fill-in order, setting a number of the previous OFF pixels to ON. Each layer is started and arranged so that the additional colors forming the dot pattern are not placed on any black areas.
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公开(公告)号：CA2384062C
公开(公告)日：2007-12-18
申请号：CA2384062
申请日：2002-04-30
Applicant: XEROX CORP
Inventor： HARRINGTON STEVEN J
Abstract: A method for utilizing redundant color inks to improve image quality while minimizing any undesirable effects such as texture or graininess. The method comprises tessellating the available redundant color space as defined by the available redundant ink colorants into regions where the regions are arrange d so as to minimize the range of luminance variation found within the regions. Th e result is perceived by the eye as less grainy in texture as well as much mor e pleasing to the eye.
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公开(公告)号：DE60014723T2
公开(公告)日：2005-10-20
申请号：DE60014723
申请日：2000-01-24
Applicant: XEROX CORP
Inventor： BOZDAGI GOZDE , HARRINGTON STEVEN J
Abstract: The scanned image registration systems according to this invention register sets of scanned subimages of an original document into a composite scanned image of the original document. The subimages are formed by scanning portions of the original document on a scanner (100) having a scan area, or window or footprint, that is smaller than the size of the document. An appropriate set of affine parameters, or more generally, transformation parameters, is obtained for each subimage relative to the fixed coordinate system. The set of affine parameters for each subimage defines the rotational and translational deformation necessary to place that subimage into a fixed coordinate system. The fixed coordinate system is preferably defined by selecting one of the subimages as a base image. The other images are then warped into registration with the selected base subimage based on the determined affine parameters. The base subimage and the warped other subimages are then combined to form the composite image of the original document. In particular, spatial averaging can be used to combine the base and warped subimages. Large format documents can thus be scanned using small window or footprint scanners.
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Patent Agency Ranking
公开(公告)号：DE60111912D1
公开(公告)日：2005-08-18
申请号：DE60111912
申请日：2001-11-22
Applicant: XEROX CORP
Inventor： HARRINGTON STEVEN J
Abstract: This invention relates to a color calibration alarm apparatus and method for use in an image-rendering device. The alarm apparatus, and associated method, make use of a sensor device that compares printed or measured color values with expected or ideal color values. If the measured values differ sufficiently from the ideal color values, the alarm apparatus signals to the user that a calibration should be performed. The printed or measured color values are obtained from a test patch that is printed, preferably, on a break page between print jobs. The alarm device is placed at the output tray of an image rendering device in one embodiment that may also be a separate stand alone hand-held unit in other embodiments where it is manually used.
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公开(公告)号：DE69732955D1
公开(公告)日：2005-05-12
申请号：DE69732955
申请日：1997-12-11
Applicant: XEROX CORP
Inventor： CAMPANELLI MICHAEL R , HARRINGTON STEVEN J
Abstract: A method of applying noise removal to an image so that the areas having the greatest variance have the least correction. First, the variance between each image pixel and its surrounding pixels is determined. Next, for the neighborhood around each pixel, a density of variance is determined. Finally the density of variance for the neighborhood around each pixel is used to correct the original pixel, the direction of correction being toward the mean value in the surrounding pixels. The result is that relatively uniform areas of the image, within which noise is most obvious, will get the most correction and areas that are textured will get the least.
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公开(公告)号：CA2216348C
公开(公告)日：2002-09-10
申请号：CA2216348
申请日：1997-09-23
Applicant: XEROX CORP
Inventor： TABER JEAN A , HARRINGTON STEVEN J
Abstract: A color image is reproduced with a set of colors wherein each color is defined in terms of a pattern block. Pattern blocks include a patte rn using the color to be reproduced and white in density-related combinations s o that the luminance difference between the color and white can be retained when copied or printed with a black printer. The patterns add among colors thus allowing combination colors to be represented in terms of added pattern s of colors represented in black as distinct patterns.
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公开(公告)号：CA2272781C
公开(公告)日：2002-02-26
申请号：CA2272781
申请日：1999-05-20
Applicant: XEROX CORP
Inventor： HARRINGTON STEVEN J , FAN ZHIGANG
Abstract: A method for color error diffusion using semi-vector quantization is proposed that simplifies error diffusion calculations. When three color separations are used, the two separations with the most visually perceptive color output are compared with one another to determine their output colors, while the third, least visually perceptive separation, is treated separately . A correction term may be applied to the third separation based on the color output of the first two separations to insure uniformity of ink coverage. Th is method yields results close to vector quantization and also minimizes fluctuation in the two most visually perceptive output colors. Of course, th is method may be used with more than three color separations. For example, when four color separations are used, the least visually perceptive color is processed differently than the three other color separations.
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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
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.
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