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1.发明授权Platen cover for a digital document scanner with electrically switchable reflectance modes 失效用于具有电气可切换反射模式的数字文档扫描仪的压板盖
公开(公告)号：US5790211A
公开(公告)日：1998-08-04
申请号：US525884
申请日：1995-09-08
申请人： Ned J. Seachman , Leon C. Williams
发明人： Ned J. Seachman , Leon C. Williams
CPC分类号： H04N1/00795 , H04N2201/0422
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US5729663A
公开(公告)日：1998-03-17
申请号：US569036
申请日：1995-12-07
申请人： Ying-wei Lin , Leon C. Williams
发明人： Ying-wei Lin , Leon C. Williams
CPC分类号： H04N1/40087
摘要： 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.
摘要翻译： 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。
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3.发明授权System and method for redistributing error values from an error diffusion process 失效从误差扩散过程重新分配误差值的系统和方法
公开(公告)号：US5696601A
公开(公告)日：1997-12-09
申请号：US285265
申请日：1994-08-03
CPC分类号： H04N1/4052
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US5390029A
公开(公告)日：1995-02-14
申请号：US185075
申请日：1994-01-24
CPC分类号： G09G5/14
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 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.
摘要翻译： 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。
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5.发明授权High addressability image generator using pseudo interpolation of video and screen data 失效高可寻址性图像发生器使用视频和屏幕数据的伪插值
公开(公告)号：US5274472A
公开(公告)日：1993-12-28
申请号：US887972
申请日：1992-05-21
申请人： Leon C. Williams
发明人： Leon C. Williams
CPC分类号： H04N1/4056 , G06T3/4007
摘要： 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.
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公开(公告)号：US5237432A
公开(公告)日：1993-08-17
申请号：US812334
申请日：1991-12-23
CPC分类号： G06T3/4007 , G06T3/60
摘要： 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.
摘要翻译： 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。
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7.发明授权Modulator control for automatically overcoming intensity variations in a laser scanner 失效用于自动克服激光扫描仪强度变化的调制器控制
公开(公告)号：US4746987A
公开(公告)日：1988-05-24
申请号：US865321
申请日：1986-05-21
CPC分类号： H04N1/40043 , G06K15/1214 , H04N1/40037 , H04N1/4005
摘要： 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.
摘要翻译： 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。
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8.发明授权Method and system for processing image information using screening and error diffusion 失效使用筛选和误差扩散处理图像信息的方法和系统公开(公告)号：US06347159B1
公开(公告)日：2002-02-12
申请号：US08285328
申请日：1994-08-03
IPC分类号： G06K936
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. A threshold circuit thresholds the 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. 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： 一种方法和系统在误差扩散过程中实现筛选和高寻址特性。 接收表示像素的灰度值。 灰度值具有对应于原始输入分辨率的第一分辨率。 然后屏蔽灰度值。 阈值电路阈值灰度值，并产生作为阈值结果的误差值。 错误值的一部分扩散到下一个扫描线上的相邻像素。 所筛选的灰度值也可被内插以产生对应于第二分辨率的子像素灰度级值。 第二分辨率高于第一分辨率，并且对应于高寻址特性。 阈值电路然后阈值灰度值，并产生具有与第一分辨率对应的分辨率的误差值。
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9.发明授权公开(公告)号：US06229923B1
公开(公告)日：2001-05-08
申请号：US09010025
申请日：1998-01-21
IPC分类号： G06K962
CPC分类号： G06K9/00456
摘要： A system and method classify a pixel of image data as one of a plurality of image types. A first image characteristic value for the pixel, a second image characteristic value for the pixel, a third image characteristic value for the pixel, and a fourth image characteristic for the pixel is determined. Some of these determinations may be resolution dependent. The values from these determination are utilized in assigning an image type classification to the pixel. Moreover, if at least one of the image characteristic values is greater than a predetermined threshold value the pixel is classified as a halftone peak value. The system includes a plurality of microclassifiers for determining a distinct image characteristic value of the pixel; a plurality of macroreduction circuits connected to the plurality of microclassifiers for performing further higher level operations upon the distinct image characteristic values of the pixel to produce reduced values; and a classification circuit to classify the pixel as an image type based on the reduced values from the macroreduction circuits. The system also includes a circuit to detect flat peaks without detecting multiple peaks and a rectangular blur filtering system.
摘要翻译： 系统和方法将图像数据的像素分类为多个图像类型之一。 确定像素的第一图像特征值，像素的第二图像特征值，像素的第三图像特征值和用于像素的第四图像特性。 这些确定中的一些可能取决于分辨率。 来自这些确定的值被用于为像素分配图像类型分类。 此外，如果图像特征值中的至少一个大于预定阈值，则将像素分类为半色调峰值。 该系统包括用于确定像素的不同图像特征值的多个微分类器; 连接到所述多个微分类器的多个宏观还原电路，用于根据所述像素的不同图像特征值进行更高级的操作以产生减小的值; 以及分类电路，用于基于来自大致减小电路的减小值将像素分类为图像类型。 该系统还包括用于检测平坦峰而不检测多个峰的电路和矩形模糊滤波系统。
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10.发明授权System and method of tonal correction of independent regions on a compound document 失效复合文件中独立区域的色调校正系统和方法公开(公告)号：US06175427B1
公开(公告)日：2001-01-16
申请号：US09063029
申请日：1998-04-20
IPC分类号： G06T540
CPC分类号： G06T5/40 , G06T5/007 , G06T2207/10008 , G06T2207/10024 , H04N1/4074
摘要： A system and method provides the necessary image information to enable tonal correction for independent regions of a compound document. A scanner scans an image and generates image data. A histogram circuit, connected to the scanner, generates histogram data from the image data for a predetermined number of regions corresponding to the image. A windowing circuit, operatively connected to the scanner and in parallel with the histogram circuit, generates a window corresponding to an independent area of the image that requires image enhancement and an association circuit associates corresponding histogram data with the generated window. The associated histogram data and window are used by an image enhancement process to modify the image data to provide a more desirable reproduction of the scanned image.
摘要翻译： 系统和方法提供必要的图像信息以对复合文档的独立区域进行色调校正。 扫描仪扫描图像并生成图像数据。 连接到扫描仪的直方图电路根据图像数据生成与图像对应的预定数量的区域的直方图数据。 可操作地连接到扫描仪并与直方图电路并行的开窗电路产生对应于需要图像增强的图像的独立区域的窗口，并且关联电路将对应的直方图数据与生成的窗口相关联。 相关联的直方图数据和窗口由图像增强处理使用以修改图像数据以提供扫描图像的更理想的再现。
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