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公开(公告)号：EP0814600A2
公开(公告)日：1997-12-29
申请号：EP97304179
申请日：1997-06-16
Applicant: XEROX CORP
Inventor： SCHWEID STUART A , METCALFE DAVID J
CPC classification number: G06T3/4007 , H04N1/4052
Abstract: A system and method for processing image data converts a pixel (Vi) of image data having a first resolution to subpixels, the subpixels representing a second resolution, the second resolution being higher than the first resolution. The subpixels are thresholded to generate a group of subpixel values for each pixel and a threshold error value (Err). It is then determined if the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel. If the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel, the group of subpixel vales is modified to produce a pattern (Binary Output) without an isolated subpixel. The modification process produces a subpixel error value which is diffused in the slowscan direction to adjacent pixels.
Abstract translation: 用于处理图像数据的系统和方法将具有第一分辨率的图像数据的像素（Vi）转换为子像素，子像素表示第二分辨率，第二分辨率高于第一分辨率。 子像素被阈值化以产生每个像素的一组子像素值和阈值误差值（Err）。 然后确定来自阈值处理的子像素值组是否产生包含隔离子像素的图案。 如果来自阈值处理的子像素值组产生包含隔离子像素的图案，则子像素值组被修改以产生没有隔离子像素的图案（二进制输出）。 修改处理产生在慢扫描方向上扩散到相邻像素的子像素误差值。
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公开(公告)号：DE102013205721A1
公开(公告)日：2013-10-24
申请号：DE102013205721
申请日：2013-03-28
Applicant: XEROX CORP
Inventor： METCALFE DAVID J , CHAN JOEL
IPC: B41J2/165
Abstract: Ein Verfahren zum Kompensieren eines fehlerhaften Tintenstrahls in einem Tintenstrahldrucker wurde entwickelt. Eine Steuereinheit identifiziert Pixel in binären Bilddaten, die dem fehlerhaften Tintenstrahl entsprechen. Die Steuereinheit identifiziert alternative Pixelpositionen für nicht-fehlerhafte Tintenstrahlen, um Tintentropfen nahe den Positionen der fehlerhaften Pixel zu drucken. Wenn ein Überlappungsparameterwert, der zwischen Tintentropfen in alternativen Pixelpositionen und anderen Tintentropfen um die alternativen Pixelpositionen herum identifiziert wurde, einen vorab definierten Wert überschreitet, ändert die Steuereinheit die alternative Pixelposition für zumindest einen Tintentropfen, um die Überlappung zu verringern und die Bildqualität zu verbessern.
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公开(公告)号：DE69836182D1
公开(公告)日：2006-11-30
申请号：DE69836182
申请日：1998-09-14
Applicant: XEROX CORP
Inventor： SCHWEID STUART A , METCALFE DAVID J
Abstract: A system and method for processing image data converts a pixel of image data having a first resolution to a plurality of subpixels, the plurality of subpixels representing a second resolution, the second resolution being higher than the first resolution. The plurality of subpixels are thresholded to generate a group of subpixel values for each pixel and a threshold error value. It is then determined if the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel. If the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel, the group of subpixel values is modified to produce a pattern without an isolated subpixel. The modification process produces a subpixel error value which is compensated for localized error before being diffused to adjacent pixels.
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公开(公告)号：DE69532730D1
公开(公告)日：2004-04-22
申请号：DE69532730
申请日：1995-12-01
Applicant: XEROX CORP
Inventor： SHIAU JENG-NAN , WILLIAMS LEON C , METCALFE DAVID J
Abstract: A process eliminates pattern shifting artifacts in a printed image by perturbing a threshold/image signal value relationship when a multi-level grey signal (VIDEO) is binarized. The process utilizes a programmable multi-level grey signal modifying circuit (5) for modifying the multi-level grey signal (VIDEO) by a predetermined value according to its grey level (see Fig. 6). The modified multi-level grey signal (VIDEO) is binarized by a comparator (1) to a binary pixel signal according to a relationship between the modified multi-level grey signal (VIDEO) and a threshold value ("128"). The process further generates an error corresponding to the relationship and diffuses the error to neighboring pixels. The multi-level grey signal (VIDEO) is modified with either random noise multiplied by a grey level dependent coefficient or by a predetermined value from a checkerboard or vertical line pattern generator (7; Figs. 4,5). The value from the pattern is dependent upon the grey level and pixel location of the image data. An apparatus for implementing the method is also disclosed.
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公开(公告)号：DE69526700T2
公开(公告)日：2002-09-12
申请号：DE69526700
申请日：1995-07-31
Applicant: XEROX CORP
Inventor： METCALFE DAVID J , SHIAU JENG-NAN , WILLIAMS LEON C
Abstract: A method and system implements a high addressability characteristic into an error diffusion process. A grey level value representing a pixel is received. The grey level value has a first resolution which corresponds to an original input resolution. The grey level value is interpolated (S30) to generate subpixel grey level values which correspond to a second resolution. The second resolution is higher than the first resolution and corresponds to the high addressability characteristic. A threshold circuit thresholds the interpolated grey level value and generates (s180) an error value as a result of the threshold. The error value has a resolution corresponding to the first resolution. A portion of the error value is diffused (S190) to adjacent pixels on a next scanline.
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Patent Agency Ranking
公开(公告)号：DE69738248D1
公开(公告)日：2007-12-13
申请号：DE69738248
申请日：1997-06-16
Applicant: XEROX CORP
Inventor： SCHWEID STUART A , METCALFE DAVID J
Abstract: A system and method for processing image data converts a pixel (Vi) of image data having a first resolution to subpixels, the subpixels representing a second resolution, the second resolution being higher than the first resolution. The subpixels are thresholded to generate a group of subpixel values for each pixel and a threshold error value (Err). It is then determined if the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel. If the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel, the group of subpixel vales is modified to produce a pattern (Binary Output) without an isolated subpixel. The modification process produces a subpixel error value which is diffused in the slowscan direction to adjacent pixels.
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公开(公告)号：DE69836182T2
公开(公告)日：2007-09-06
申请号：DE69836182
申请日：1998-09-14
Applicant: XEROX CORP
Inventor： SCHWEID STUART A , METCALFE DAVID J
Abstract: A system and method for processing image data converts a pixel of image data having a first resolution to a plurality of subpixels, the plurality of subpixels representing a second resolution, the second resolution being higher than the first resolution. The plurality of subpixels are thresholded to generate a group of subpixel values for each pixel and a threshold error value. It is then determined if the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel. If the group of subpixel values from the thresholding process produce a pattern containing an isolated subpixel, the group of subpixel values is modified to produce a pattern without an isolated subpixel. The modification process produces a subpixel error value which is compensated for localized error before being diffused to adjacent pixels.
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公开(公告)号：DE69532730T2
公开(公告)日：2004-08-19
申请号：DE69532730
申请日：1995-12-01
Applicant: XEROX CORP
Inventor： SHIAU JENG-NAN , WILLIAMS LEON C , METCALFE DAVID J
Abstract: A process eliminates pattern shifting artifacts in a printed image by perturbing a threshold/image signal value relationship when a multi-level grey signal (VIDEO) is binarized. The process utilizes a programmable multi-level grey signal modifying circuit (5) for modifying the multi-level grey signal (VIDEO) by a predetermined value according to its grey level (see Fig. 6). The modified multi-level grey signal (VIDEO) is binarized by a comparator (1) to a binary pixel signal according to a relationship between the modified multi-level grey signal (VIDEO) and a threshold value ("128"). The process further generates an error corresponding to the relationship and diffuses the error to neighboring pixels. The multi-level grey signal (VIDEO) is modified with either random noise multiplied by a grey level dependent coefficient or by a predetermined value from a checkerboard or vertical line pattern generator (7; Figs. 4,5). The value from the pattern is dependent upon the grey level and pixel location of the image data. An apparatus for implementing the method is also disclosed.
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公开(公告)号：DE69526159D1
公开(公告)日：2002-05-08
申请号：DE69526159
申请日：1995-07-31
Applicant: XEROX CORP
Inventor： METCALFE DAVID J , SHIAU JENG-NAN , WILLIAMS LEON C
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公开(公告)号：BR9503503A
公开(公告)日：1996-05-28
申请号：BR9503503
申请日：1995-07-31
Applicant: XEROX CORP
Inventor： WILLIAMS LEON C , SHIAU JENG-NAN , METCALFE DAVID J
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