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31. 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

32. 发明授权

EP0696130B1 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：EP0696130B1
公开(公告)日：2002-04-03
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

33. 发明公开

EP0903692A3 System and method for two-dimensional interpolation 审中-公开
标题翻译： Verfahren und Vorrichtung zur zweidimensionalen插值
公开(公告)号：EP0903692A3
公开(公告)日：2000-01-05
申请号：EP98307194.5
申请日：1998-09-07
申请人： XEROX CORPORATION
发明人： Choi, Yungran , Williams, Leon C. , Ziobro, James M.
IPC分类号： G06T3/40
CPC分类号： G06T3/4007
摘要： An image processing system scales the size of an image represented by a plurality of input video signals, by a desired scaling ratio, so as to represent the image with a plurality of output video signals different in number than the input video signals. The system includes a control circuit (52) for producing a scale factor and a scale factor valid signal and a video signal magnitude calculating circuit (50), responsive to the scale factor and scale factor valid signal from the control means, for producing an output video signal as a function of at least one input video signal. The control circuit (52) requests a next input scanline to be received by the video signal magnitude calculating circuit (50) when the video signal magnitude calculating circuit produces the output video signal so as to transfer input scanlines to the video signal magnitude calculating circuit at a non-constant video rate.
摘要翻译：图像处理系统按照期望的比例比例缩放由多个输入视频信号表示的图像的大小，以便以与输入视频信号不同的多个输出视频信号表示图像。该系统包括用于产生比例因子和比例因子有效信号的控制电路（52）和响应于来自控制装置的比例因子和比例因子有效信号的视频信号幅度计算电路（50），用于产生输出视频信号作为至少一个输入视频信号的函数。当视频信号幅度计算电路产生输出视频信号以便将输入扫描线传送到视频信号幅度计算电路时，控制电路（52）请求由视频信号幅度计算电路（50）接收的下一个输入扫描线，非恒定视频速率。

34. 发明授权

EP0571167B1 High addressability image generator using pseudo interpolation of video and screen data 失效
标题翻译：图像生成高寻址能力使用视频和画面数据的伪插
公开(公告)号：EP0571167B1
公开(公告)日：1999-01-27
申请号：EP93303808.5
申请日：1993-05-17
申请人： XEROX CORPORATION
发明人： Williams, Leon C.
IPC分类号： H04N1/40
CPC分类号： H04N1/4056 , G06T3/4007

35. 发明公开

EP0696132A3 A method of high addressability error diffusion 失效
标题翻译：误差扩散法高寻址能力
公开(公告)号：EP0696132A3
公开(公告)日：1997-01-02
申请号：EP95305327.9
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
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 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.

36. 发明公开

EP0571167A3 High addressability image generator using pseudo interpolation of video and screen data 失效
标题翻译：高可寻址性图像生成器，使用视频和屏幕数据的伪插值
公开(公告)号：EP0571167A3
公开(公告)日：1994-01-26
申请号：EP93303808.5
申请日：1993-05-17
申请人： XEROX CORPORATION
发明人： Williams, Leon C.
IPC分类号： H04N1/40
CPC分类号： H04N1/4056 , G06T3/4007
摘要： A method to convert gray level image data (V) from image input terminals, into binary data (O) for high-addressability image output terminals. High addressability output terminals such as printers (100) increase their virtual resolution in the fast scan direction in order to achieve a higher effective printing resolution. For example, one pixel (102) in the slow scan direction divided into eight pixels (106) in the fast scan direction, improves a printer's actual resolution from n spots x m spots per unit area to (8 * n) spots x m spots per unit area. Gray level input data representing pixel data from image input terminals such as scanners is encoded by either an analog signal or a quantized digital signal with a large number of levels (e.g. 256 levels). Binary output data has pixels with either a value of one or zero or a much smaller number of gray levels compared to digital input signals.
摘要翻译：一种将来自图像输入终端的灰度级图像数据（V）转换为用于高寻址性图像输出终端的二进制数据（O）的方法。诸如打印机（100）之类的高可寻址输出终端在快速扫描方向上增加其虚拟分辨率，以实现更高的有效打印分辨率。例如，慢速扫描方向上的一个像素（102）在快速扫描方向上被分成八个像素（106），将打印机的实际分辨率从每个单位面积的n个点xm点到每单位面积的（8 * n）个点xm个点区。表示来自诸如扫描仪的图像输入终端的像素数据的灰度级输入数据由具有大量级别（例如，256级）的模拟信号或量化数字信号编码。与数字输入信号相比，二进制输出数据的像素值为1或0，或者灰度级数量少得多。

37. 发明公开

EP0571167A2 High addressability image generator using pseudo interpolation of video and screen data 失效
标题翻译： Bildgenerator hoher Adressierbarkeit unter Benutzung einer Pseudo-Interpolation von Video- und Bildschirmdaten。
公开(公告)号：EP0571167A2
公开(公告)日：1993-11-24
申请号：EP93303808.5
申请日：1993-05-17
申请人： XEROX CORPORATION
发明人： Williams, Leon C.
IPC分类号： H04N1/40
CPC分类号： H04N1/4056 , G06T3/4007
摘要： A method to convert gray level image data (V) from image input terminals, into binary data (O) for high-addressability image output terminals. High addressability output terminals such as printers (100) increase their virtual resolution in the fast scan direction in order to achieve a higher effective printing resolution. For example, one pixel (102) in the slow scan direction divided into eight pixels (106) in the fast scan direction, improves a printer's actual resolution from n spots x m spots per unit area to (8 * n) spots x m spots per unit area. Gray level input data representing pixel data from image input terminals such as scanners is encoded by either an analog signal or a quantized digital signal with a large number of levels (e.g. 256 levels). Binary output data has pixels with either a value of one or zero or a much smaller number of gray levels compared to digital input signals.
摘要翻译：将灰度级图像数据（V）从图像输入端子转换成用于高可寻址性图像输出端子的二进制数据（O）的方法。诸如打印机（100）的高可寻址性输出端子在快速扫描方向增加其虚拟分辨率，以便实现更高的有效打印分辨率。例如，在快速扫描方向上被分成8个像素（106）的慢扫描方向上的一个像素（102）可以提高打印机从每单位面积的n个点xm个点到每个单位的（8 * n个）点xm个点的实际分辨率区。表示来自诸如扫描仪的图像输入端子的像素数据的灰度级输入数据由具有大量电平（例如256级）的模拟信号或量化数字信号编码。二进制输出数据具有与数字输入信号相比值为1或零或灰度级小得多的像素。

38. 发明公开

EP1094662A3 Detection and elimination of scanning artifacts 有权
标题翻译：检测和清除抽样误差
公开(公告)号：EP1094662A3
公开(公告)日：2004-12-01
申请号：EP00122730.5
申请日：2000-10-18
申请人： Xerox Corporation
发明人： Metcalfe, David J. , Williams, Leon C. , Triplett, Roger L.
IPC分类号： H04N1/409 , H04N1/38
CPC分类号： H04N1/4095
摘要： The present invention provides a process for masking a scanning artifact within image data representing a document. The process includes generating pixel classification tags for the image data; identifying a window within the image data associated with a scanning artifact using the pixel classification tags; analyzing the image data to derive a replacement video value; and replacing image data associated with a scanning artifact with the replacement video value.

39. 发明授权

EP0696132B1 A method of high addressability error diffusion 失效
标题翻译：误差扩散法高寻址能力
公开(公告)号：EP0696132B1
公开(公告)日：2002-05-15
申请号：EP95305327.9
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

40. 发明公开

EP1073258A3 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：EP1073258A3
公开(公告)日：2001-07-18
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
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 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.
摘要翻译：当多级灰度信号（VIDEO）被二值化时，通过扰乱阈值/图像信号值关系，过程消除了打印图像中的图案偏移伪像。该过程利用可编程多级灰度信号修改电路（5），根据其灰度级将多级灰度信号（VIDEO）修改预定值（参见图6）。根据修改的多级灰度信号（VIDEO）与阈值（“128”）之间的关系，修改的多级灰度信号（VIDEO）由比较器（1）二值化为二值像素信号。该过程进一步产生对应于该关系的误差并将该误差扩散到相邻像素。多级灰度信号（VIDEO）用乘以灰度级依赖系数的随机噪声或者来自棋盘格或垂直线模式发生器（7;图4,5）的预定值来修改。来自图案的值取决于图像数据的灰度级和像素位置。还公开了用于实现该方法的设备。

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