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1. 发明授权

EP0715451B1 Error diffusion pattern shifting reduction through programmable threshold perturbation 失效
标题翻译：通过可编程门限扰动来减少误差扩散模式转换
公开(公告)号：EP0715451B1
公开(公告)日：2001-11-07
申请号：EP95308690.7
申请日：1995-12-01
申请人： XEROX CORPORATION
发明人： Shiau, Jeng-Nan , Williams, Leon C. , Metcalfe, David J.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053

2. 发明公开

EP0806863A3 Image classification system with fuzzy logic 失效
标题翻译：图像分类系统与模糊逻辑
公开(公告)号：EP0806863A3
公开(公告)日：1999-06-02
申请号：EP97303136.2
申请日：1997-05-08
申请人： XEROX CORPORATION
发明人： Schweid, Stuart A. , Shiau, Jeng-Nan , Clark, Raymond J.
IPC分类号： H04N1/40
CPC分类号： H04N1/40062 , G06T7/44 , Y10S706/90
摘要： Described herein is a method and system for electronically fuzzy classifying a pixel belonging to a set of digital image data with respect to a membership of the pixel in a plurality of image classes. This process determines a fuzzy classification of the pixel and generates an effect tag for the pixel based on the fuzzy classification determination. Each class is defined by a set of heuristic rules such that the image classes are non-mutually exclusive. The heuristic rules are a set of conditions that define the membership value of the pixel within a certain class, thereby allowing a pixel to have a membership value in every possible image class.

3. 发明公开

EP0812103A2 Method and system for reducing grey levels of a pixel 失效
标题翻译： Verfahren und System zur Verringerung der Graupegel eines Bildelements
公开(公告)号：EP0812103A2
公开(公告)日：1997-12-10
申请号：EP97303837.5
申请日：1997-06-04
申请人： XEROX CORPORATION
发明人： Shiau, Jeng-Nan , Metcalfe, David J.
IPC分类号： H04N1/40
CPC分类号： H04N1/4052
摘要： A method and system assign an image classification (WindowBit) to a multi-level grey scale pixel value (V i ). The multi-level grey scale pixel value is modified based on an error (E FB , E FIFO )generated by previously processed pixels and the image classification of the multi-level grey scale pixel and processed based on the assigned image classification to reduce the number of grey levels in the multi-level grey scale pixel value. An error (E rr ) is generated based on the processing of the modified multi-level grey scale pixel value and a portion of the error (E FB ) is diffused to a next pixel in a fastscan direction and a remaining portion of the error (E FIFO ) is diffused to pixels in a slowscan direction. The modified multi-level grey scale pixel value referred above includes an error from the previously processed neighboring pixels if the current pixel is classified as being processed as an error diffused pixel. The modified multi-level grey scale pixel value equals to the original pixel value if the current pixel is classified as being processed as a non-error diffused pixel.
摘要翻译：一种方法和系统将图像分类（WindowBit）分配给多级灰度像素值（Vi）。基于由先前处理的像素产生的误差（EFB，EFIFO）和多级灰度级像素的图像分类修改多级灰度像素值，并根据所分配的图像分类进行处理以减少灰度数级别在多级灰度像素值。基于修改的多级灰阶像素值的处理产生错误（Err），并且误差的一部分（EFB）被扩散到快扫方向的下一个像素，并且误差的剩余部分（EFIFO）以慢扫描方向扩散到像素。上述修改的多级灰阶像素值包括如果当前像素被分类为被作为误差扩散像素处理的来自先前处理的相邻像素的误差。如果当前像素被分类为被处理为非误差扩散像素，则修改的多级灰度像素值等于原始像素值。

4. 发明公开

EP0715451A3 Error diffusion pattern shifting reduction through programmable threshold perturbation 失效
标题翻译：减少的误差扩散模式的位移与可编程阈值病症
公开(公告)号：EP0715451A3
公开(公告)日：1997-11-26
申请号：EP95308690.7
申请日：1995-12-01
申请人： XEROX CORPORATION
发明人： Shiau, Jeng-Nan , Williams, Leon C. , Metcalfe, David J.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053
摘要： 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 from a 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.

5. 发明公开

EP0696130A3 A system and method for implementing fast high addressability error diffusion process 失效
标题翻译：系统和方法，用于具有高寻址能力进行快速误差扩散方法
公开(公告)号：EP0696130A3
公开(公告)日：1996-12-27
申请号：EP95305325.3
申请日：1995-07-31
申请人： XEROX CORPORATION
发明人： Metcalfe, David J. , Shiau, Jeng-Nan , Williams, Leon C.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053
摘要： 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 is interpolated to generate subpixel grey level values which correspond to a second resolution. A threshold circuit thresholds the interpolated grey level value. In parallel to the interpolation circuit and threshold circuit is an error circuit which generates a plurality of possible error values. One of the plurality of possible error values is selected based on the number of subpixels exceeding a threshold value. A portion of the selected error value is then diffused to adjacent pixels on a next scanline.

6. 发明公开

EP0696129A3 Method and system for image conversion utilizing dynamic error diffusion 无效
标题翻译：利用动态误差扩散的图像转换方法和系统
公开(公告)号：EP0696129A3
公开(公告)日：1996-12-27
申请号：EP95305324.6
申请日：1995-07-31
申请人： XEROX CORPORATION
发明人： Metcalfe, David J. , Shiau, Jeng-Nan , Williams, Leon C.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053
摘要： A method and system implements a dynamic error diffusion process. A grey level value representing a pixel is received. An image segmentation circuit (15) determines an image characteristic of the pixel being processed. A threshold circuit (10; Fig.3) thresholds the grey level value (pixel) and generates an error value as a result of the threshold process. A portion of the error value is diffused by error diffusion circuit(5)to adjacent pixels on a next scanline. The distribution of this error value is dynamic in that different sets of weighting coefficients, stored in memory(4), are used based the image characteristic of the processed pixel. One set of coefficients are utilized in processing a pixel having a first image characteristic, and a second set of coefficients are utilized in processing a pixel having a second image characteristic.
摘要翻译：一种方法和系统实现了动态误差扩散过程。接收表示像素的灰度值。图像分割电路（15）确定正在处理的像素的图像特征。阈值电路（10;图3）对灰度值（像素）进行阈值并且由于阈值处理而产生误差值。误差值的一部分被误差扩散电路（5）扩散到下一条扫描线上的相邻像素。该误差值的分布是动态的，因为存储在存储器（4）中的不同组加权系数是基于处理后的像素的图像特性使用的。一组系数用于处理具有第一图像特征的像素，并且第二组系数用于处理具有第二图像特征的像素。

7. 发明公开

EP0696131A2 A method and system for processing image information using screening and error diffusion 失效
标题翻译：使用半色调和误差扩散的方法和装置的图像信息处理
公开(公告)号：EP0696131A2
公开(公告)日：1996-02-07
申请号：EP95305326.1
申请日：1995-07-31
申请人： XEROX CORPORATION
发明人： Metcalfe, David J. , Shiau, Jeng-Nan , Williams, Leon C.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053
摘要： A method and system implements screening and 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 then screened (1). A threshold circuit (9) thresholds the grey level value and generates an error value (e FB ) as a result of the threshold. A portion of the error value is diffused (7) to adjacent pixels on a next scanline. The screened grey level value can also be interpolated 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. The threshold circuit would then threshold the grey level value and generate an error value having a resolution corresponding to the first resolution.
摘要翻译：的方法和系统实现了筛选和高寻址能力的特性进到误差扩散处理。接收表示像素的灰度级值。的灰度级值具有在原来的输入分辨率对应于第一分辨率。然后，将灰度级值进行筛选（1）。阈值电路（9）阈值的灰度级值，并产生误差值（E FB）作为阈值的结果率。误差值的一部分被扩散（7）到相邻像素上的下一个扫描线。因此，该筛选灰度级值可以被内插，以产生对应于第二子像素分辨率的灰度等级值。所述第二分辨率比所述第一分辨率高和对应于高寻址能力的特性。阈值电路随后将阈值的灰度级值，并产生具有分辨率对应于第一分辨率误差值。

8. 发明公开

EP0696129A2 Method and system for image conversion utilizing dynamic error diffusion 无效
标题翻译： Bildumsetzungsverfahren und-system unter Verwendung von dynamischer Fehler扩散
公开(公告)号：EP0696129A2
公开(公告)日：1996-02-07
申请号：EP95305324.6
申请日：1995-07-31
申请人： XEROX CORPORATION
发明人： Metcalfe, David J. , Shiau, Jeng-Nan , Williams, Leon C.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053
摘要： A method and system implements a dynamic error diffusion process. A grey level value representing a pixel is received. An image segmentation circuit (15) determines an image characteristic of the pixel being processed. A threshold circuit (10; Fig.3) thresholds the grey level value (pixel) and generates an error value as a result of the threshold process. A portion of the error value is diffused by error diffusion circuit(5)to adjacent pixels on a next scanline. The distribution of this error value is dynamic in that different sets of weighting coefficients, stored in memory(4), are used based the image characteristic of the processed pixel. One set of coefficients are utilized in processing a pixel having a first image characteristic, and a second set of coefficients are utilized in processing a pixel having a second image characteristic.
摘要翻译：一种方法和系统实现了动态误差扩散过程。接收表示像素的灰度值。图像分割电路（15）确定被处理像素的图像特性。阈值电路（10;图3）阈值灰度值（像素），并作为阈值处理的结果生成错误值。错误值的一部分由误差扩散电路（5）扩散到下一扫描线上的相邻像素。基于处理后的像素的图像特征，使用存储在存储器（4）中的不同的加权系数集合，这种误差值的分布是动态的。一组系数用于处理具有第一图像特性的像素，并且第二组系数被用于处理具有第二图像特性的像素。

9. 发明授权

EP1073258B1 Error diffusion pattern shifting reduction through programmable threshold perturbation 失效
标题翻译：减少的误差扩散模式的位移与可编程阈值病症
公开(公告)号：EP1073258B1
公开(公告)日：2004-03-17
申请号：EP00121254.7
申请日：1995-12-01
申请人： Xerox Corporation
发明人： Shiau, Jeng-Nan , Williams, Leon C. , Metcalfe, David J.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053

10. 发明授权

EP0696131B1 A method and system for processing image information using screening and error diffusion 失效
标题翻译：使用半色调和误差扩散的方法和装置的图像信息处理
公开(公告)号：EP0696131B1
公开(公告)日：2002-04-03
申请号：EP95305326.1
申请日：1995-07-31
申请人： XEROX CORPORATION
发明人： Metcalfe, David J. , Shiau, Jeng-Nan , Williams, Leon C.
IPC分类号： H04N1/405
CPC分类号： H04N1/4053

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