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公开(公告)号：US5642202A
公开(公告)日：1997-06-24
申请号：US347756
申请日：1994-12-01
申请人： Leon C. Williams , Jeng-nan Shiau
发明人： Leon C. Williams , Jeng-nan Shiau
CPC分类号： H04N1/047 , H04N1/4076 , H04N2201/04729 , H04N2201/04789
摘要： A system and method for calibrating a printing system includes a printer and a master test image document printed by the printer. The master test image has three locator symbols and a plurality of test objects, each symbol having a distinct apex. The apexes are non-colinear. A memory prestores image data corresponding to the test objects printed on the master test image document and positional data corresponding to a desired coordinate value for each non-colinear apex. The system also includes a scanner for scanning the master test image document and detects the locator symbols printed on master test image document to generate transition data therefrom. The calibration process determines a coordinate value for each non-colinear apex based on the transition data and generates a transformation matrix based on a difference between the determined coordinate value for each non-colinear apex and the desired coordinate value for each non-colinear apex. A compensation process retrieves prestored image data corresponding to the scanned image data based on the transformation matrix. The calibration process then compares scanned image data with the retrieved prestored image data to generate compensation values based on a difference between the scanned image data and the prestored image data.
摘要翻译： 用于校准打印系统的系统和方法包括由打印机打印的打印机和主测试图像文档。 主测试图像具有三个定位符符号和多个测试对象，每个符号具有不同的顶点。 顶点是非共线的。 存储器预先存储对应于打印在主测试图像文档上的测试对象的图像数据和对应于每个非共线顶点的期望坐标值的位置数据。 该系统还包括用于扫描主测试图像文档并检测打印在主测试图像文档上的定位符号以从其生成转换数据的扫描仪。 校准过程基于转移数据确定每个非共线顶点的坐标值，并且基于每个非共线顶点的确定坐标值与每个非共线顶点的期望坐标值之间的差产生变换矩阵。 补偿过程基于变换矩阵来检索对应于扫描图像数据的预存储图像数据。 然后，校准过程将扫描图像数据与检索到的预存图像数据进行比较，以基于扫描图像数据和预存图像数据之间的差异生成补偿值。
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2.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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3.发明授权公开(公告)号：US06427030B1
公开(公告)日：2002-07-30
申请号：US08285324
申请日：1994-08-03
IPC分类号： G06K946
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 determines an image characteristic of the pixel being processed. A threshold circuit 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 to adjacent pixels on a next scanline. The distribution of this error value is dynamic in that different sets of weighting coefficients 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。 图像分割电路确定正在处理的像素的图像特性。 阈值电路对灰度值（像素）进行阈值，并作为阈值处理的结果产生误差值。 错误值的一部分扩散到下一个扫描线上的相邻像素。 基于经处理的像素的图像特性，使用不同的加权系数集合，该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。
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4.发明授权公开(公告)号：US06181829B2
公开(公告)日：2001-01-30
申请号：US09010331
申请日：1998-01-21
IPC分类号： G06K940
CPC分类号： H04N1/40062
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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5.发明授权Method and system for processing image information using expanded dynamic screening and error diffusion 失效使用扩展动态筛选和误差扩散处理图像信息的方法和系统
公开(公告)号：US5787206A
公开(公告)日：1998-07-28
申请号：US655422
申请日：1996-05-30
CPC分类号： H04N1/4053
摘要： A printing system for rendering marks on a recording medium receives a multi-level grey scale pixel value representing a pixel having a first resolution. A screening circuit generates a screened multi-level grey scale pixel value equal to (G.sub.L -V.sub.i)+(S.sub.i -Th)*Dmp.sub.vi *Mod.sub.Eff wherein G.sub.L is the maximum grey level value of the pixel, V.sub.i is equal to the multi-level grey scale pixel value of the first resolution, S.sub.i is equal to a screen value corresponding to a position of the pixel, Th is the threshold value, Dmp.sub.vi is a video dependent dampening factor, and Mod.sub.Eff is a modulation multiplication factor. An interpolator converts the screened multi-level grey scale pixel value to a second resolution, the second resolution being higher than the first resolution, and a binarization circuit binarizes the converted multi-level grey scale pixel value so as to output a binary signal and an error value, the error value having a resolution equal to the first resolution. The error value is diffused to multi-level grey scale pixel values corresponding to pixels adjacent to the pixel having the first resolution, and the binary signal is converted into a mark on the recording medium.
摘要翻译： 用于在记录介质上渲染标记的打印系统接收表示具有第一分辨率的像素的多级灰度像素值。 筛选电路产生等于（GL-Vi）+（Si-Th）* Dmpvi * ModEff的屏蔽多级灰度像素值，其中GL是像素的最大灰度级值，Vi等于多级 第一分辨率的灰阶像素值，Si等于与像素的位置对应的屏幕值，Th是阈值，Dmpvi是视频相关的衰减因子，ModEff是调制倍增因子。 内插器将所筛选的多级灰阶像素值转换为第二分辨率，第二分辨率高于第一分辨率，二值化电路对转换后的多级灰阶像素值进行二值化处理，以输出二进制信号和 误差值，误差值具有等于第一分辨率的分辨率。 误差值扩散到与具有第一分辨率的像素相邻的像素对应的多级灰度像素值，并且二进制信号被转换成记录介质上的标记。
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6.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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7.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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8.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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9.发明授权Hybrid error diffusion pattern shifting reduction using programmable threshold perturbation 失效使用可编程阈值扰动的混合误差扩散模式移位减少
公开(公告)号：US5809177A
公开(公告)日：1998-09-15
申请号：US660045
申请日：1996-06-06
CPC分类号： H04N1/4053
摘要： A process eliminates pattern shifting artifacts in a printed image rendered using a hybrid high addressable error diffusion process by perturbing a threshold/image signal value relationship when a multi-level grey level is binarized. The process utilizes a programmable multi-level grey signal modifying circuit for modifying the multi-level grey signal by a predetermined value according to its grey level. The modified multi-level grey signal is binarized to a binary pixel signal according to a relationship between the modified multi-level grey signal and a threshold value. The process further generates an error corresponding to the relationship and diffuses the error to neighboring pixels. The multi-level grey signal 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. The value from the pattern is dependent upon the grey level and pixel location of the image data.
摘要翻译： 当多级灰度级被二值化时，处理消除了使用混合高可寻址误差扩散处理所形成的打印图像中的图案移位伪像，该方法通过扰乱阈值/图像信号值关系。 该过程利用可编程多级灰度信号修正电路，根据其灰度级将多级灰度信号修正预定值。 修改后的多级灰度信号根据修改的多级灰度信号与阈值之间的关系被二值化为二进制像素信号。 该过程进一步产生与该关系对应的错误，并将误差扩散到相邻像素。 多级灰度信号用随机噪声乘以灰度级依赖系数或来自棋盘或垂直线图案的预定值进行修改。 图案中的值取决于图像数据的灰度级和像素位置。
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公开(公告)号：US5608821A
公开(公告)日：1997-03-04
申请号：US285326
申请日：1994-08-03
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 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 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 to adjacent pixels on a next scanline.
摘要翻译： 一种方法和系统在误差扩散过程中实现了高寻址特性。 接收表示像素的灰度值。灰度级具有对应于原始输入分辨率的第一分辨率。 内插灰度值以生成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。 阈值电路对内插灰度值进行阈值，并作为阈值的结果生成错误值。 误差值具有对应于第一分辨率的分辨率。 错误值的一部分扩散到下一个扫描线上的相邻像素。
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