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公开(公告)号：US5903681A
公开(公告)日：1999-05-11
申请号：US685740
申请日：1996-07-24
CPC分类号： G06T5/20
摘要： An arrangment is disclosed for reducing edge artifacts produced when printing a digital image on a digital printer, which printer is capable of producing multiple output levels, said digital image being represented as a rectangular array of pixels. In this arrangement, the following steps are accomplished by: computing difference signals between a center pixel value and pixel values of a set of one or more neighboring pixels; determining a pixel correction value responsive to the computed difference signals; and computing a new center pixel value by modifying the center pixel value using the pixel correction value.
摘要翻译： 公开了一种用于减少在数字打印机上打印数字图像时产生的边缘伪像的布置，该打印机能够产生多个输出电平，所述数字图像被表示为矩形像素阵列。 在这种布置中，通过以下步骤来实现以下步骤：计算中心像素值与一组或多个相邻像素的像素值之间的差分信号; 响应于所计算的差信号确定像素校正值; 以及通过使用像素校正值修改中心像素值来计算新的中心像素值。
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公开(公告)号：US5581371A
公开(公告)日：1996-12-03
申请号：US399678
申请日：1995-03-07
IPC分类号： H04N1/405
CPC分类号： H04N1/4053
摘要： An improved error diffusion method for producing an output image from an input image having a set of digitized continuous-tone pixels is disclosed. The method includes computing a visually perceived input value for a digitized continuous-tone input pixel and computing a visually perceived output value for each of the possible output levels. The method further includes selecting the output level in response to the visually perceived input values and the visually perceived output value for each of the possible output levels according to an error criterion; determining an error signal between the visually perceived input value and the visually perceived output value for the selected output level; and weighting the error signal and adjusting the computed visually perceived input values for nearby pixels which have not been processed.
摘要翻译： 公开了一种用于从具有一组数字化连续色调像素的输入图像产生输出图像的改进的误差扩散方法。 该方法包括计算用于数字化连续色调输入像素的视觉感知输入值，并计算每个可能输出电平的视觉感知输出值。 该方法还包括响应于视觉感知的输入值和根据错误标准的每个可能输出电平的视觉感知输出值来选择输出电平; 确定视觉感知的输入值与所选输出电平的视觉感知输出值之间的误差信号; 并对误差信号进行加权并调整对于尚未处理的附近像素的计算出的视觉感知输入值。
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53.发明授权Method and apparatus employing mean preserving spatial modulation for transforming a digital color image signal 失效使用平均保留空间调制来变换数字彩色图像信号的方法和装置
公开(公告)号：US5377041A
公开(公告)日：1994-12-27
申请号：US143674
申请日：1993-10-27
申请人： Kevin E. Spaulding , Kevin C. Scott
发明人： Kevin E. Spaulding , Kevin C. Scott
CPC分类号： H04N1/648 , H04N1/6019
摘要： This invention minimizes the visibility of quantization artifacts associated with multi-dimensional color-calibration look-up tables of a limited size. Such artifacts occur when it is not practical to use interpolation methods to approximate color values which are intermediate to the color values stored in the look-up table. In such cases the input color signals are simply quantized for the purpose of addressing the look-up table. This invention works by applying local mean preserving spatial modulation to the input color image values prior to the quantization step. As with multi-level halftoning techniques, the result is that the appearance of intermediate color values is created because the observer will spatially average the output color values.
摘要翻译： 本发明使与有限尺寸的多维颜色校准查找表相关联的量化伪像的可见性最小化。 当使用插值方法来近似在存储在查找表中的颜色值的中间的颜色值是不实际的时候，会发生这种伪像。 在这种情况下，为了寻址查找表的目的，输入颜色信号被简单量化。 本发明通过在量化步骤之前对输入的彩色图像值应用局部平均维持空间调制来工作。 与多级半色调技术一样，结果是创建中间色彩值的外观，因为观察者将在空间上平均输出颜色值。
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54.发明授权Method for generating halftone image data with randomly selected threshold array 失效用于通过随机选择的阈值阵列生成黑客图像数据的方法
公开(公告)号：US5150428A
公开(公告)日：1992-09-22
申请号：US677933
申请日：1991-04-01
IPC分类号： H04N1/405
CPC分类号： H04N1/4055
摘要： In the present invention each input pixel value is compared against a randomly selected threshold value to provide an output pixel having a value indicative of which of the values is greater. The threshold value is selected from one of a plurality of threshold matrices, each having a predetermined number of threshold values that are arranged in a pattern with the values for a base matrix being increased by an increment for each succeeding one of the plurality of threshold matrices. The selection of the one threshold matrix is made by means of a pseudo-random number generator.
摘要翻译： 在本发明中，将每个输入像素值与随机选择的阈值进行比较，以提供具有指示哪个值更大的值的输出像素。 阈值从多个阈值矩阵中的一个中选择，每个阈值矩阵具有预定数量的阈值，其以图形排列，其中基本矩阵的值增加了多个阈值矩阵中的每个后续的一个阈值的增量 。 通过伪随机数发生器来进行一个阈值矩阵的选择。
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公开(公告)号：US08272710B2
公开(公告)日：2012-09-25
申请号：US12174061
申请日：2008-07-16
IPC分类号： B41J2/205
CPC分类号： B41J19/142 , G06K15/107
摘要： A method for reducing banding artifacts for bi-directional multi-pass printing on an inkjet printer utilizing a printhead with a plurality of ink nozzles includes defining different print masks to be used for leftward and rightward printing passes such that both the order of ink laydown and the timing between ink laydown on different passes are each substantially constant for a given horizontal position within the image, independent of the vertical position within the image; and printing an input image on the inkjet printer with the defined print masks using a bi-directional multi-pass print mode.
摘要翻译： 一种利用具有多个墨水喷嘴的打印头在喷墨打印机上减少用于双向多次打印的条纹伪影的方法包括限定用于向左和向右打印通过的不同打印掩模，使得墨水沉积和 与图像内的垂直位置无关，图像中给定水平位置的不同通道之间的墨水沉积之间的时间大致恒定; 以及使用双向多遍打印模式使用所定义的打印掩模在喷墨打印机上打印输入图像。
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公开(公告)号：US08085436B2
公开(公告)日：2011-12-27
申请号：US12330552
申请日：2008-12-09
CPC分类号： H04N1/60
摘要： A method for printing an input digital image using a digital printer having a set of colorants with substantially the same color but different densities, including a sequence of node points where each of the two or more colorants are either at their maximum or minimum values, setting colorant concentrations such that the color channel output responses corresponding to the sequence of node points are substantially equally spaced in a visually uniform color space; forming colorant control look-up tables to provide smooth transitions in the color channel output response between the sequence of node points; addressing the colorant control look-up tables with the printer code value for each pixel of the input digital image to determine the colorant control signals for each of the two or more colorants; and controlling the digital printer using the colorant control signals to produce a print of the input digital image.
摘要翻译： 一种使用具有基本上相同颜色但不同密度的一组着色剂的数字打印机打印输入数字图像的方法，包括其中两个或更多个着色剂中的每一个处于其最大值或最小值的节点点序列，设置 着色剂浓度使得对应于节点点序列的颜色通道输出响应在视觉均匀的颜色空间中基本相等间隔; 形成着色剂控制查找表，以在节点间序列中的颜色通道输出响应中提供平滑过渡; 使用输入数字图像的每个像素的打印机代码值寻址着色剂控制查找表，以确定两种或更多种着色剂中的每一种的着色剂控制信号; 以及使用着色剂控制信号来控制数字打印机以产生输入数字图像的打印。
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公开(公告)号：US20100202710A1
公开(公告)日：2010-08-12
申请号：US12764406
申请日：2010-04-21
IPC分类号： G06K9/36
CPC分类号： G06T7/0004 , G06T2207/20021 , G06T2207/20052 , G06T2207/30144 , G06T2207/30168 , H04N19/60 , H04N19/85
摘要： A method for determining a sharpness predictor for an input digital image includes determining one or more image metrics by analyzing the input digital image; and determining the sharpness predictor from the one or more image metrics.
摘要翻译： 用于确定输入数字图像的锐度预测器的方法包括通过分析输入数字图像来确定一个或多个图像度量; 以及从所述一个或多个图像度量确定所述锐度预测器。
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公开(公告)号：US07764844B2
公开(公告)日：2010-07-27
申请号：US10938770
申请日：2004-09-10
IPC分类号： G06K9/36
CPC分类号： G06T7/0004 , G06T2207/20021 , G06T2207/20052 , G06T2207/30144 , G06T2207/30168 , H04N19/60 , H04N19/85
摘要： A method for determining a sharpness predictor for an input digital image includes determining one or more image metrics by analyzing the input digital image; and determining the sharpness predictor from the one or more image metrics.
摘要翻译： 用于确定输入数字图像的锐度预测器的方法包括通过分析输入数字图像来确定一个或多个图像度量; 以及从所述一个或多个图像度量确定所述锐度预测器。
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公开(公告)号：US07715043B2
公开(公告)日：2010-05-11
申请号：US11362346
申请日：2006-02-24
CPC分类号： G06K15/107 , G06K2215/0094
摘要： A method of computing swath data in response to a digital image having a plurality of rows and columns of pixels, each pixel having a multitone code value, the swath data suitable for commanding an inkjet printer containing at least one printhead having plurality of nozzles, wherein the inkjet printer is capable of ejecting ink drops in response to the swath data.
摘要翻译： 一种响应于具有多个像素行和列的数字图像来计算条带数据的方法，每个像素具有多音码代码值，所述幅条数据适用于命令包含具有多个喷嘴的至少一个打印头的喷墨打印机， 其中所述喷墨打印机能够响应于所述幅数据喷射墨滴。
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公开(公告)号：US20100103438A1
公开(公告)日：2010-04-29
申请号：US12257417
申请日：2008-10-24
IPC分类号： H04N1/60
CPC分类号： H04N1/60 , H04N1/6083 , H04N1/6088
摘要： A method for selecting the level of color inconstancy of an output image produced on a digital color printer having a neutral ink and a plurality of color inks is disclosed. The method includes analyzing the distribution of input colors present in the input digital image to determine a color distribution metric related to the importance of producing output images having a reduced color inconstancy when the output image is viewed under a variety of image illumination spectra; selecting a color transform from a set of available color transforms designed to produce output images having different color inconstancy characteristics in response to the color distribution metric; processing the input digital image using the selected color transform to produce a transformed image having a selected level of color inconstancy; and printing the transformed image on the digital color printer to produce an output image having the selected level of color inconstancy.
摘要翻译： 公开了一种用于选择在具有中性墨水和多种颜色墨水的数字彩色打印机上产生的输出图像的颜色不均匀度的方法。 该方法包括分析输入数字图像中存在的输入颜色的分布，以确定当在各种图像照明光谱下观看输出图像时，与产生具有减小的颜色不一致的输出图像的重要性相关的颜色分布度量; 从一组可用的颜色变换中选择颜色变换，所述颜色变换被设计成响应颜色分布度量产生具有不同颜色不变特征的输出图像; 使用所选择的颜色变换来处理所述输入数字图像以产生具有所选择的颜色不均匀水平的变换图像; 并且在数字彩色打印机上打印经变换的图像，以产生具有所选择的颜色不均匀水平的输出图像。
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