公开(公告)号：US5790211A

公开(公告)日：1998-08-04

申请号：US525884

申请日：1995-09-08

Applicant: Ned J. Seachman ,  Leon C. Williams

Inventor： Ned J. Seachman ,  Leon C. Williams

IPC: H04N1/10 ,  H04N1/00 ,  H04N1/107 ,  G02F1/13

CPC classification number: H04N1/00795 ,  H04N2201/0422

Abstract: A system and method digitally scans a document using a high reflectance mode and a low reflectance mode. Initially, a platen cover provides a low reflectance background around the document and the scanner scans the low reflectance background and document to determine an edge of the document or to retrieve other image characteristics of the document. Subsequently, the platen cover changes so as to provide a high reflectance background around the document. The scanner then scans the high reflectance background and the document and produces digital image data relating to an image on the document.

Abstract translation: 系统和方法使用高反射率模式和低反射率模式对文档进行数字扫描。 最初，压板盖在文件周围提供低反射率背景，并且扫描仪扫描低反射率背景和文档以确定文档的边缘或检索文档的其他图像特征。 随后，压板盖改变，以便在文件周围提供高反射率背景。 然后，扫描仪扫描高反射率背景和文档，并产生与文档上的图像有关的数字图像数据。

公开(公告)号：US5729663A

公开(公告)日：1998-03-17

申请号：US569036

申请日：1995-12-07

Applicant: Ying-wei Lin ,  Leon C. Williams

Inventor： Ying-wei Lin ,  Leon C. Williams

IPC: H04N1/405 ,  H04N1/40 ,  H04N1/41

CPC classification number: H04N1/40087

Abstract: The present invention is a method and apparatus for generating N-bit per pixel output signals in response to M-bit per pixel image input signals, where M is greater than N. The invention employs a halftone cell threshold memory that stores a single threshold for each cell element. During real-time processing of the video image signals, multiple thresholds are calculated based upon the stored thresholds, and the image signals are compared to the thresholds. The threshold calculation process is simplified by using equally spaced constants and any desired variation from the resulting equally spaced thresholds is accomplished through a remapping of the video image signals using a look-up table. The output of the plurality of comparisons carried out for each halftone cell element is then encoded to produce a digital gray-scale output signal.

Abstract translation: 本发明是一种用于响应于M位每像素图像输入信号产生N位每像素输出信号的方法和装置，其中M大于N.本发明采用半色调单元阈值存储器，其存储单个阈值 每个单元格元素。 在视频图像信号的实时处理期间，基于存储的阈值计算多个阈值，并将图像信号与阈值进行比较。 通过使用等间隔的常数来简化阈值计算过程，并且通过使用查找表重新映射视频图像信号来实现来自所得等间隔的阈值的任何期望的变化。 然后对每个半色调单元元素执行的多个比较的输出被编码以产生数字灰度输出信号。

公开(公告)号：US5696601A

公开(公告)日：1997-12-09

申请号：US285265

申请日：1994-08-03

Applicant: David J. Metcalfe ,  Jeng-Nan Shiau ,  Leon C. Williams

Inventor： David J. Metcalfe ,  Jeng-Nan Shiau ,  Leon C. Williams

IPC: H04N1/403 ,  H04N1/405 ,  H04N1/40

CPC classification number: H04N1/4052

Abstract: A method and system implements a redistributive characteristic into an error diffusion process. A grey level value representing a pixel is received. A threshold circuit thresholds the received grey level value and generates an error value as a result of the threshold. A portion of the error value is diffused to adjacent pixels on a next scanline. All the error for a single pixel on the next scanline is accumulated. Since this accumulated error has a greater number of bits than can be stored in a buffer, a portion of the accumulated error is truncated and redistributed to a down stream pixel for inclusion in the downstream pixel's error accumulation process. The grey level value has a first resolution which corresponds to an original input resolution. In a high addressabilty environment, the received grey level value is interpolated to subpixel grey level values before thresholding.

Abstract translation: 一种方法和系统在误差扩散过程中实现再分配特性。 接收表示像素的灰度值。 阈值电路对接收的灰度级值进行阈值，并作为阈值的结果生成错误值。 错误值的一部分扩散到下一个扫描线上的相邻像素。 累积下一个扫描线上单个像素的所有错误。 由于该累加误差具有比可以存储在缓冲器中更多的位数，所以累积误差的一部分被截断并重新分配给下行像素以包括在下游像素的误差累加处理中。 灰度值具有对应于原始输入分辨率的第一分辨率。 在高可寻址环境中，接收到的灰度值被内插到阈值处理之前的子像素灰度值。

公开(公告)号：US5390029A

公开(公告)日：1995-02-14

申请号：US185075

申请日：1994-01-24

Applicant: Leon C. Williams ,  Francis K. Tse ,  Robert F. Buchheit

Inventor： Leon C. Williams ,  Francis K. Tse ,  Robert F. Buchheit

IPC: H04N1/387 ,  G06T3/00 ,  G09G5/14 ,  H04N1/40 ,  G06K9/36

CPC classification number: G09G5/14

Abstract: 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 non-overlapping tiles, the boundaries of which correspond to transitions from one window region to another. Each tile therefore 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. Tile data is stored in one of two memory banks, thereby enabling bank switching and reprogramming of the device in real-time to permit management of complex window shapes. The apparatus is designed to efficiently manage the identification of tile regions while minimizing the required decoding hardware. The apparatus also provides flexibility of programming resulting in greater efficiency of memory usage.

Abstract translation: 一种用于控制对图像信号阵列执行的图像处理操作的执行的方法和装置，该特定操作已经被多个预定窗口识别。 窗口被分成多个不重叠的瓦片，其边界对应于从一个窗口区域到另一个窗口区域的过渡。 因此，每个瓦片在图像信号阵列内定义独占区域，并且将图像处理操作应用于该区域的边界内的信号。 平铺数据存储在两个存储体之一中，从而能够实时地对设备进行库切换和重新编程，以允许管理复杂的窗口形状。 该设备被设计为在最小化所需的解码硬件的同时有效地管理瓦片区域的识别。 该设备还提供了编程的灵活性，从而提高了存储器使用的效率。

公开(公告)号：US5274472A

公开(公告)日：1993-12-28

申请号：US887972

申请日：1992-05-21

Applicant: Leon C. Williams

Inventor： Leon C. Williams

IPC: B41J2/52 ,  G06T3/40 ,  H04N1/405 ,  H04N1/40

CPC classification number: H04N1/4056 ,  G06T3/4007

Abstract: There is provided a method to convert gray level image data from image input terminals, into binary data for high-addressability image output terminals. High addressability output terminals such as printers increase their virtual resolution in the fast scan direction in order to achieve a higher effective printing resolution. For example, one pixel in the slow scan direction divided into eight pixels in the fast scan direction, improves a printer's actual resolution from n spots.times.m spots per unit area to (8 * n) spots.times.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.

公开(公告)号：US5237432A

公开(公告)日：1993-08-17

申请号：US812334

申请日：1991-12-23

Applicant: Anthony F. Calarco ,  Ying-wei Lin ,  Leon C. Williams

Inventor： Anthony F. Calarco ,  Ying-wei Lin ,  Leon C. Williams

IPC: H04N1/393 ,  G06T3/40 ,  G06T3/60

CPC classification number: G06T3/4007 ,  G06T3/60

Abstract: An image processing system for altering the size of an image represented by a plurality of input video signals including a controller for producing a scale factor and a scale factor valid signal. The controller also includes a padder which is used to increase the accuracy of the scale factor during the operation of the controller. The signals generated by the controller are passed to an interpolator suitable for producing an output signal as a function of one or more of the input video signals in response to the scale factor and scale factor valid signal.

Abstract translation: 一种用于改变由多个输入视频信号表示的图像的尺寸的图像处理系统，包括用于产生比例因子的控制器和比例因子有效信号。 控制器还包括一个焊盘，用于在控制器的操作期间提高比例因子的精度。 由控制器产生的信号被传送到适于根据比例因子和比例因子有效信号产生作为一个或多个输入视频信号的函数的输出信号的内插器。

公开(公告)号：US4746987A

公开(公告)日：1988-05-24

申请号：US865321

申请日：1986-05-21

Applicant: James C. Traino ,  Leon C. Williams ,  Kwok-leung Yip ,  J. Terrence Flynn

Inventor： James C. Traino ,  Leon C. Williams ,  Kwok-leung Yip ,  J. Terrence Flynn

IPC: G02F1/11 ,  G06K15/12 ,  H04N1/113 ,  H04N1/40 ,  H04H1/04

CPC classification number: H04N1/40043 ,  G06K15/1214 ,  H04N1/40037 ,  H04N1/4005

Abstract: A scanner with high intensity source beam, a modulator for modulating the source beam to provide a zero order beam and first order writing beam in response to an image signal input, a polygon for scanning the writing beam across a moving recording member to write images thereon, a sensor in the path of the zero order beam providing a first black beam intensity signal while scanning between pages and a second white beam intensity signal while the writing beam scans an image background area, a circuit for differencing the first and second beam intensity signals from one another to provide a composite intensity signal representing the intensity of the source beam, and a second circuit for differencing the composite beam intensity signal from an intensity setpoint signal to provide a correction signal for adjusting the rf power to the modulator to maintain a substantially constant writing beam intensity.In a second embodiment, the correction signal is determined by a successive approximation register.

Abstract translation: 一种具有高强度源光束的扫描器，用于调制源光束以响应于图像信号输入提供零级光束和一阶写入光束的调制器，用于扫描写入光束跨越移动记录部件以在其上写入图像的多边形 在零光束的路径中的传感器在写入光束扫描图像背景区域时在扫描页面和第二白光束强度信号之间提供第一黑光束强度信号，用于差分第一和第二光束强度信号的电路 提供表示源光束的强度的复合强度信号，以及用于将合成光束强度信号与强度设定点信号进行差分的第二电路，以提供校正信号，用于调整调制器的功率以维持基本上 恒定写入光束强度。 在第二实施例中，校正信号由逐次逼近寄存器确定。

公开(公告)号：US06678414B1

公开(公告)日：2004-01-13

申请号：US09505875

申请日：2000-02-17

Applicant: Robert P. Loce ,  Clara Cuciurean-Zapan ,  Leon C. Williams

Inventor： Robert P. Loce ,  Clara Cuciurean-Zapan ,  Leon C. Williams

IPC: G06T700

CPC classification number: H04N1/40075 ,  G06K9/4609 ,  G06K9/56

Abstract: An apparatus and method of template fitting for fitting a plurality of templates in correspondence with a gray-scale image, including receiving gray-scale image information of an observed image; defining a window of the gray-scale image information so as to enable a loose-gray-scale fit between the defined window and the plurality of templates; extracting a plurality of pixels of the image information and using the window to which to fit at least one of the plurality of templates. Further, fitting one of the plurality of templates to the defined window within a threshold looseness interval associated with the template wherein a looseness interval between the window of image data and the template is less than the threshold looseness interval.

Abstract translation: 一种用于与灰度图像相对应地装配多个模板的模板拟合装置和方法，包括接收观察图像的灰度图像信息; 定义灰度图像信息的窗口，以便能够在所定义的窗口和多个模板之间进行松散灰度拟合; 提取所述图像信息的多个像素并使用与所述多个模板中的至少一个模拟的所述窗口。 此外，在与模板相关联的阈值松动间隔内将多个模板中的一个拟合到定义的窗口，其中图像数据的窗口与模板之间的松动间隔小于阈值松动间隔。

公开(公告)号：US06411735B1

公开(公告)日：2002-06-25

申请号：US09158868

申请日：1998-09-23

Applicant: Leon C. Williams ,  Raymond J. Clark ,  Stuart A. Schweid

Inventor： Leon C. Williams ,  Raymond J. Clark ,  Stuart A. Schweid

IPC: G06K962

CPC classification number: G06K9/00456 ,  H04N1/40062

Abstract: A method and apparatus are disclosed for distinguishing noisy continuous tone document types from other document types such as halftone or text, in order to maintain reliable image segmentation. In both cases a Range of Video microclassifier is added to the other microclassifiers (Sij, estimated halftone frequency, etc.) to disqualify noisy continuous tone images from being incorrectly classified as other document types such as halftone or text document types.

Abstract translation: 公开了一种用于区分噪声连续色调文档类型和其他文档类型（例如半色调或文本）的方法和装置，以便保持可靠的图像分割。 在这两种情况下，将视频微分类器的范围添加到其他微分类器（Sij，估计的半色调频率等），以使噪声连续色调图像被不正确地分类为诸如半色调或文本文档类型的其他文档类型。

公开(公告)号：US06304679B1

公开(公告)日：2001-10-16

申请号：US08297437

申请日：1994-08-29

Applicant: Terri A. Clingerman ,  Leon C. Williams

Inventor： Terri A. Clingerman ,  Leon C. Williams

IPC: G06K936

CPC classification number: H03H17/0202 ,  G06T5/20

Abstract: A structure for implementing a plurality of two-dimensional digital filters, such as finite impulse response filters, in an efficient manner. The structure includes a plurality of first stage filters operating in a first dimension in combination with a single second stage filter, operating in a second dimension. The second stage filter being suitable for receiving output from one of the first stage filters. A controller, operating in conjunction with the first and second stage filters is utilized for controlling the operation of all filters, as well as the selection of the input source for the second stage filter.

Abstract translation: 用于以有效的方式实现多个二维数字滤波器的结构，例如有限脉冲响应滤波器。 该结构包括多个第一级过滤器，其与第二维度中操作的单个第二级过滤器结合操作。 第二级过滤器适于接收来自第一级过滤器之一的输出。 与第一和第二级滤波器一起操作的控制器用于控制所有滤波器的操作以及用于第二级滤波器的输入源的选择。