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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

EP0929181A1 Image input device and method for providing scanning artifact detection 审中-公开
标题翻译： Bildeingabegerätund Verfahren zum Erkennen von Abtastfehlern
公开(公告)号：EP0929181A1
公开(公告)日：1999-07-14
申请号：EP99100193.4
申请日：1999-01-07
申请人： Xerox Corporation
发明人： Schweid, Stuart A. , Williams, Leon C.
IPC分类号： H04N1/38 , H04N1/409
CPC分类号： H04N1/409 , H04N1/38 , H04N1/4097
摘要： A system and method which enables the location and orientation of an image to be determined without introducing scanning artifacts into the rendered image. The system utilizes a separate set of sensors on a scanning bar that are sensitive to a wavelength of light outside the range of wavelengths of the typical sensors found on the scanning bar, such as red, green, or blue. Moreover, the system includes a light source which is capable of emitting the wavelength of light that is outside this range of wavelength of light. Thus, whenever the additional set of sensors detect light, the system would determine that the light was due to a scanning artifact, such as a hole, rip, or dog ear in the original document being scanned. Furthermore, the system would include a process which measures the variations of the image signal in the fastscan and slowscan directions, as well as, the gray level of the video signal from these various measurements, the system would develop a cost value as to the certainty as whether the signal represents a scanning artifact. In such a system, the backing would be embedded with a pattern which would have a predetermined variation in a fastscan direction but have little or no variation in a slowscan direction.
摘要翻译：一种能够确定图像的位置和方向而不将扫描伪影引入到渲染图像中的系统和方法。该系统在扫描杆上使用对扫描条上发现的典型传感器波长范围（例如红色，绿色或蓝色）的波长的波长敏感的扫描条上的一组传感器。此外，该系统包括能够发射在该波长范围之外的光的波长的光源。因此，只要附加的一组传感器检测到光，则系统将确定该光是由于正被扫描的原始文档中的扫描伪影，例如孔，裂或狗耳。此外，该系统将包括测量在快扫和慢扫描方向上的图像信号的变化以及来自这些各种测量的视频信号的灰度级的过程，系统将产生关于确定性的成本值作为信号是否表示扫描伪像。在这种系统中，背衬将嵌入一种图案，该图案将在快速扫描方向上具有预定的变化，但在慢扫描方向上几乎没有或没有变化。

3. 发明授权

EP0657866B1 Method and apparatus for controlling the processing of digital image signals 失效
标题翻译：用于控制数字图像信号的处理方法和装置，
公开(公告)号：EP0657866B1
公开(公告)日：1998-10-14
申请号：EP94119163.7
申请日：1994-12-05
申请人： XEROX CORPORATION
发明人： Williams, Leon C.
IPC分类号： G09G5/14
CPC分类号： G09G5/14 , H04N1/40

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. 发明公开

EP0657866A1 Method and apparatus for controlling the processing of digital image signals 失效
标题翻译：的方法和装置，用于控制数字图像信号的处理。
公开(公告)号：EP0657866A1
公开(公告)日：1995-06-14
申请号：EP94119163.7
申请日：1994-12-05
申请人： XEROX CORPORATION
发明人： Williams, Leon C.
IPC分类号： G09G5/14
CPC分类号： G09G5/14 , H04N1/40
摘要： A method and apparatus for controlling the execution of image processing operations carried out on an array of image signals, the specific operations having been identified by a plurality of predefined windows. The windows are divided into a plurality of regions, the boundaries of which correspond to transitions from one window region to another. Each region defines an exclusive region within the array of image signals, and the image processing operations to be applied to the signals within the boundaries of that region. The image processing operations are selected by decoding an effect data word that is assigned to each pixel and which follows the pixel along the image processing path. The bits within the effect data word are not assigned individual significance which allows the effect data word, in most cases, to maintain the same bit length even though additional image processing procedures or modules have been added to the image processing path. The apparatus is designed to efficiently manage the identification of regions while minimizing the bit length of the effect data word used to identify the image processing steps. The apparatus also provides flexibility of architecture design resulting in more efficient expansion of functions and easier modifications to existing functions.
摘要翻译：一种用于控制上进行了图像信号的阵列的图像处理操作的执行方法和装置，具有被识别BY预定窗口的多个特定操作。窗口被划分成区域的复数，其中的边界对应于转变从一个窗口到另一个区域。每个区域定义检测区专属的图像信号的阵列内，并且所述图像处理操作，以区域的没有边界内被施加到信号。所述的图像处理操作是通过解码，以实现数据字也被分配给每个像素，并且遵循沿着图像处理路径中的像素中选择。效果数据字内的比特没有被分配，其允许所述效果数据字，在大多数个体意义情况下，为了维持相同的位长，即使附加的图像处理过程或模块已被添加到图像处理路径，该装置被设计为有效地管理区域的识别，同时最小化用于识别所述效果数据字的位长图像处理步骤。所以该装置提供的结构是设计在功能和更容易修改现有的功能更有效的膨胀导致的灵活性。

10. 发明授权

EP0696133B1 A system and method for redistributing error values from an error diffusion process 失效
标题翻译：系统和用于误差值的再分配方法，误差扩散处理
公开(公告)号：EP0696133B1
公开(公告)日：2002-04-03
申请号：EP95305328.7
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： H04N1/4052

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