公开(公告)号：US20060077489A1

公开(公告)日：2006-04-13

申请号：US10923116

申请日：2004-08-20

申请人： Yeqing Zhang ,  Robert Loce ,  Beilei Xu

发明人： Yeqing Zhang ,  Robert Loce ,  Beilei Xu

IPC分类号： H04N1/46

CPC分类号： H04N1/603

摘要： Compensation for rendering device non-uniformities is provided for halftoned images. A spatially dependent tone reproduction curve (TRC) provides compensation values. Pixel location information is used to access TRC values. For example, the values are modification values. The modification values are added to the pixel values to generate combined values. Quantization is applied to the combined values to prepare compensated image data for rendering. For example, Rank Ordered Error Diffusion is applied to the combined values. The combined values may include diffused error from previously processed pixels. Gray values may be estimated for the respective pixels. The estimated gray values may be used to access compensation information from a TRC that is both spatially and gray value dependent. Mathematical basis decomposition is used to reduce TRC memory requirements. For example, Discrete Cosine Transformation, Singular Value Decomposition or Principal Component Analysis is used to determine a compact form for the TRC.

公开(公告)号：US20050275855A1

公开(公告)日：2005-12-15

申请号：US10852243

申请日：2004-05-25

申请人： Howard Mizes ,  Beilei Xu ,  Chu-heng Liu ,  Robert Loce ,  Michael Thompson ,  Eric Hamby ,  R. Viturro

发明人： Howard Mizes ,  Beilei Xu ,  Chu-heng Liu ,  Robert Loce ,  Michael Thompson ,  Eric Hamby ,  R. Viturro

IPC分类号： B41J29/46 ,  G01N21/88 ,  G03G21/00 ,  H04N1/00 ,  H04N1/409 ,  H04N1/58

CPC分类号： H04N1/00002 ,  H04N1/00015 ,  H04N1/00031 ,  H04N1/00045 ,  H04N1/00053 ,  H04N1/00063 ,  H04N1/00068 ,  H04N1/00087

摘要： A method of measuring and controlling high frequency banding, the method includes creating a test pattern, sensing the test pattern with optical sensors, determining a beat frequency based on the sensed test pattern, and determining the frequency, phase and amplitude of high frequency banding based on the beat frequency. An exemplary embodiment of a feedback control method for controlling high frequency banding includes creating a test pattern, sensing the test pattern with optical sensors, measuring high frequency banding and adjusting the imaging parameters based on the measured high frequency banding in order to decrease the extent of high frequency banding. Moreover, an exemplary embodiment of a system for measuring high frequency banding includes an image marking device having a receiving member, optical sensors arranged on the receiving member, and a controller that is functionally coupled to the optical sensors and to the marking device.

摘要翻译： 一种测量和控制高频带的方法，该方法包括创建测试图案，用光学传感器感测测试图案，基于感测到的测试图案确定拍频，以及确定基于高频带的频率，相位和幅度 在拍频上 用于控制高频带的反馈控制方法的示例性实施例包括创建测试图案，用光学传感器感测测试图案，测量高频带并基于所测量的高频带来调整成像参数，以便降低 高频带。 此外，用于测量高频带的系统的示例性实施例包括具有接收构件的图像标记装置，布置在接收构件上的光学传感器以及功能上耦合到光学传感器和标记装置的控制器。

公开(公告)号：US20060152764A1

公开(公告)日：2006-07-13

申请号：US11034057

申请日：2005-01-13

申请人： Robert Loce ,  Beilei Xu ,  Reiner Eschbach ,  David Lieberman

发明人： Robert Loce ,  Beilei Xu ,  Reiner Eschbach ,  David Lieberman

IPC分类号： H04N1/405

CPC分类号： H04N1/407 ,  H04N1/40068 ,  H04N1/4052

摘要： A method of adjusting a TRC of an image is provided. The method involves receiving an image at an input resolution, resampling the image to a processing resolution if the imput resolution and the processing resolution are not same, processing the image using rank-ordered error diffusion, and resampling the processed image to a desired output resolution for the image if the processing resolution and the output resolution are not same.

摘要翻译： 提供了一种调整图像的TRC的方法。 该方法包括以输入分辨率接收图像，如果输入分辨率和处理分辨率不相同，则将图像重新采样到处理分辨率，使用等级错误扩散处理图像，并将处理的图像重新采样到期望的输出分辨率 对于图像，如果处理分辨率和输出分辨率不相同。

公开(公告)号：US20060023258A1

公开(公告)日：2006-02-02

申请号：US10909627

申请日：2004-08-02

申请人： Robert Loce ,  Charles Hains ,  Beilei Xu ,  Connie Purdum ,  Xiaoxue Cheng

发明人： Robert Loce ,  Charles Hains ,  Beilei Xu ,  Connie Purdum ,  Xiaoxue Cheng

IPC分类号： H04N1/405

CPC分类号： H04N1/4058

摘要： A method for minimizing boundary effects when switching between halftone screens on a scanline, includes selecting a first halftone screen having a first fundamental frequency and a first angle for printing pixels of a first type; and selecting a second halftone screen having a second fundamental frequency and a second angle for printing pixels of a second type, wherein the second frequency and second angle are harmonically matched to the first frequency and first angle, wherein at least one pixel of the second type is adjacent to a pixel of the first type. In one embodiment, the first and second frequencies are selected to have a substantially zero frequency beat. In another, the first and second frequencies are selected to have a substantially high frequency beat.

摘要翻译： 一种用于在扫描线上的半色调屏幕之间切换时最小化边界效应的方法，包括选择具有第一基频和第一角度的第一半色调屏幕，用于打印第一类型的像素; 以及选择具有第二基频和第二角度的第二半色调屏幕，用于打印第二类型的像素，其中所述第二频率和第二角度与所述第一频率和第一角度谐波匹配，其中所述第二类型的至少一个像素 与第一类型的像素相邻。 在一个实施例中，第一和第二频率被选择为具有基本为零的频率节拍。 在另一个中，选择第一和第二频率具有基本上高的频率节拍。

公开(公告)号：US20070147684A1

公开(公告)日：2007-06-28

申请号：US11317818

申请日：2005-12-23

申请人： Robert Loce ,  Beilei Xu ,  Stuart Schweid ,  Son Nguyen ,  Michael Branciforte

发明人： Robert Loce ,  Beilei Xu ,  Stuart Schweid ,  Son Nguyen ,  Michael Branciforte

IPC分类号： G06K9/48 ,  G06K9/40

CPC分类号： G06K9/00986 ,  G06K9/4609 ,  G06K9/56

摘要： The teachings provided herein disclose a method for the identification of edge pixels within a digital image. The method operates by generating edge-state codes for a plurality of pairs of neighboring vectors of pixels within a given observation window, and generating an edge-identification code from the plurality of edge-state codes using a look-up table. The edge identification provides information that can be used for subsequent treatments such as rendering anti-aliased pixels, selecting preferred halftoning and tone reproduction for edge pixels, corner sharpening, and object recognition and segmentation.

摘要翻译： 本文提供的教导公开了一种用于识别数字图像内的边缘像素的方法。 该方法通过为给定观察窗口内的多个相邻像素向量对生成边缘状态码，并且使用查找表从多个边缘状态码生成边缘识别码来操作。 边缘识别提供可用于后续处理的信息，例如渲染抗锯齿像素，选择边缘像素的优选半色调和色调再现，角锐化和对象识别和分割。

公开(公告)号：US20070053003A1

公开(公告)日：2007-03-08

申请号：US11218966

申请日：2005-09-02

申请人： Robert Loce ,  Beilei Xu ,  Raja Bala

发明人： Robert Loce ,  Beilei Xu ,  Raja Bala

IPC分类号： H04N1/405

CPC分类号： H04N1/60 ,  H04N1/40075

摘要： Aspects of color of a halftoned image are controlled or adjusted. A method for adjustment can include determining a color description of a color of an area or window associated with a target halftoned pixel, determining a desired adjustment to the color associated with the target pixel, determining a color change value based on the desired adjustment and the color description associated with the target pixel, combining the color change value with at least one value of the target halftoned pixel, thereby generating at least one combined target pixel value and quantizing the at least one combined target pixel value. For instance error diffusion and/or rank-ordered error diffusion is used to perform the quantization. Color adjustments can be based on user preference and/or calibration compensations between original and target devices.

摘要翻译： 控制或调整半色调图像的颜色方面。 一种用于调整的方法可以包括确定与目标半色调像素相关联的区域或窗口的颜色的颜色描述，确定与目标像素相关联的颜色的期望调整，基于期望的调整确定颜色变化值，以及 与目标像素相关联的颜色描述，将颜色变化值与目标半色调像素的至少一个值组合，从而生成至少一个组合目标像素值并量化至少一个组合目标像素值。 例如，误差扩散和/或等级有序误差扩散用于执行量化。 颜色调整可以基于原始设备和目标设备之间的用户偏好和/或校准补偿。

公开(公告)号：US20070052991A1

公开(公告)日：2007-03-08

申请号：US11222260

申请日：2005-09-08

申请人： Nancy Goodman ,  Robert Loce ,  William Nowak ,  Howard Mizes ,  Peter Paul ,  Beilei Xu ,  Wencheng Wu ,  Jack Lestrange

发明人： Nancy Goodman ,  Robert Loce ,  William Nowak ,  Howard Mizes ,  Peter Paul ,  Beilei Xu ,  Wencheng Wu ,  Jack Lestrange

IPC分类号： G06K15/00

CPC分类号： B41J29/393 ,  G03G15/5062 ,  G03G2215/00067

摘要： A test target is written in a non image zone at set time intervals. The test target is sensed. At least one of frequency, amplitude and phase of banding, which is inherent in a printing device, is determined based on the sensed test target. At least one banding compensation parameter based at least on one of the determined frequency, amplitude and phase of banding is determined. Characteristics of producing an image based on the determined banding compensation parameter are adjusted to compensate the banding inherent in the printing device.

摘要翻译： 测试目标以设定的时间间隔写入非图像区域。 感测测试目标。 基于感测的测试目标来确定打印设备中固有的条带的频率，幅度和相位中的至少一个。 确定至少一个带状补偿参数，至少基于所确定的条带的频率，振幅和相位之一。 调整基于确定的条带补偿参数产生图像的特性，以补偿打印装置固有的条带。

公开(公告)号：US20070147699A1

公开(公告)日：2007-06-28

申请号：US11317427

申请日：2005-12-23

申请人： Robert Loce ,  Beilei Xu ,  Stuart Schweid ,  Son Nguyen ,  Michael Branciforte

发明人： Robert Loce ,  Beilei Xu ,  Stuart Schweid ,  Son Nguyen ,  Michael Branciforte

IPC分类号： G06K9/40

CPC分类号： G06K9/4609 ,  G06T5/003 ,  G06T5/20 ,  G06T7/13 ,  G06T2207/20164 ,  G06T2207/20192 ,  H04N1/4092

摘要： The teachings provided herein disclose a method for corner sharpening in the display of a bitmapped digital image. The method includes the steps of selecting a target pixel location within the digital image; observing a set of pixels within a pixel observation window superimposed on the digital image relative to the target pixel location; generating edge-state codes for a plurality of pairs of neighboring vectors of pixels within the pixel observation window; generating corner-identification codes from the plurality of edge-state codes using at least one look-up table so as to thereby identify corner pixels; and, assigning a pixel value in an output image plane in a location corresponding to the target pixel in the input image, such that assigned value extends a corner where indicated by a corner identification code, thereby producing a sharpening effect. The method may be used for improving the print quality of line-art corners and other fine details as found in both font and image data.

摘要翻译： 本文提供的教导公开了一种用于在位图数字图像的显示中进行拐角锐化的方法。 该方法包括以下步骤：在数字图像内选择目标像素位置; 观察相对于目标像素位置叠加在数字图像上的像素观察窗内的一组像素; 为所述像素观察窗口内的多个相邻像素向量对生成边缘状态代码; 使用至少一个查找表从所述多个边缘状态代码生成角标识码，从而识别角落像素; 并且在与输入图像中的目标像素相对应的位置的输出图像平面中分配像素值，使得分配值延伸由拐角识别码指示的角部，从而产生锐化效果。 该方法可以用于提高字体和图像数据中发现的线条角落的其他精细细节的打印质量。

公开(公告)号：US20070146796A1

公开(公告)日：2007-06-28

申请号：US11318131

申请日：2005-12-23

申请人： Robert Loce ,  Beilei Xu ,  Stuart Schweid ,  Son Nguyen ,  Michael Branciforte

发明人： Robert Loce ,  Beilei Xu ,  Stuart Schweid ,  Son Nguyen ,  Michael Branciforte

IPC分类号： G06F15/00

CPC分类号： H04N1/4055 ,  H04N1/4092

摘要： The teachings provided herein disclose a method for producing digital image objects with enhanced halftone edges. The method operates by selecting a target pixel location within the digital image; observing a set of pixels within a pixel observation window superimposed on the digital image relative to the target pixel location; generating edge-state codes for a plurality of pairs of neighboring vectors of pixels within the pixel observation window; generating edge-identification codes from the plurality of edge-state codes using at least one look-up table; and, utilizing the edge-identification code to select and apply to the digital image at the target pixel either a first halftone screen having a first fundamental frequency and a first angle or a second halftone screen having a second fundamental frequency and a second angle, wherein the second frequency and second angle are harmonically matched to the first frequency and first angle. The method solves the problem of ragged edges on halftone tints as an automated, operation, with a computing architecture that is readily adapted to a wide variety of tinted edge conditions, and which can be readily adapted to real-time applications.

摘要翻译： 本文提供的教导公开了一种用于产生具有增强的半色调边缘的数字图像对象的方法。 该方法通过选择数字图像内的目标像素位置来操作; 观察相对于目标像素位置叠加在数字图像上的像素观察窗内的一组像素; 为所述像素观察窗口内的多个相邻像素向量对生成边缘状态代码; 使用至少一个查找表从所述多个边缘状态代码生成边缘识别码; 并且利用边缘识别码选择并应用于目标像素处的数字图像，即具有第一基频和第一角度的第一半色调屏幕或具有第二基频和第二角度的第二半色调屏幕，其中 第二频率和第二角度与第一频率和第一角度谐波匹配。 该方法解决了作为自动化操作的半色调色调上的粗糙边缘的问题，其具有易于适应各种着色边缘条件的计算架构，并且其可以容易地适应于实时应用。

公开(公告)号：US20060232822A1

公开(公告)日：2006-10-19

申请号：US11108497

申请日：2005-04-18

申请人： Shen-ge Wang ,  Beilei Xu ,  Robert Loce

发明人： Shen-ge Wang ,  Beilei Xu ,  Robert Loce

IPC分类号： H04N1/409

CPC分类号： H04N1/409 ,  H04N1/52

摘要： A method for avoiding objectionable moiré in a color image can include identifying a problematic excitation angle associated with a problematic excitation in a marking process or in the color image and selecting a set of at least two halftone screens for rendering at least two separations of the color image wherein the set of screens is selected to avoid including significant screen fundamental, harmonic and beat frequencies at angles closer than about 1 degree of the identified problematic excitation angle. Halftoning the color image according to the selected set of screens avoids objectionable moiré associated with the problematic excitation.

摘要翻译： 用于避免彩色图像中的令人反感的莫尔条纹的方法可以包括识别与标记过程或彩色图像中的有问题的激励相关联的有问题的激发角度，并且选择一组至少两个半色调屏幕，用于渲染颜色的至少两个分色 图像，其中所述屏幕组被选择以避免在所识别的有问题的激励角度的近似1度的角度包括显着的屏幕基本，谐波和拍频。 根据所选择的一组屏幕对色彩图像进行半色调，避免与有问题的激发相关的令人反感的莫尔。