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1. 发明申请

US20060087694A1 Tinted edge enhancement using harmonic halftones for the boundary pixels 有权
标题翻译：带边缘增强使用谐波半色调为边界像素
公开(公告)号：US20060087694A1
公开(公告)日：2006-04-27
申请号：US10973725
申请日：2004-10-26
申请人： Connie Purdum , Robert Loce , Beilei Xu , David Lieberman , Mark Gwaltney , Jon McElvain , Charles Hains
发明人： Connie Purdum , Robert Loce , Beilei Xu , David Lieberman , Mark Gwaltney , Jon McElvain , Charles Hains
IPC分类号： H04N1/405
CPC分类号： H04N1/4092 , H04N1/4058
摘要： Disclosed herein is an image processing method for producing enhanced halftone edges, particularly suited to those edges which only lie upon the background as apposed to those edges which abut other halftone screens. It utilizes a step of defining border pixels and a step of halftoning those border pixels in a different manner than the halftoning applied to the interior region of the tint or image segment. The preferred halftone for the border pixels will be related to the interior halftone by some number of common spatial frequency harmonics. Examples of common-harmonic screening for an edge include, but are not limited to: (a) same screen with different tone reproduction characteristics (boosted edge values); (b) same screen angles and frequencies with a different spot function, possibly phase shifted; (c) a dot screen whose frequency vectors can be generated by the frequency vectors of the interior screen; (d) a line screen whose frequency vectors can be generated by the frequency vectors of the interior screen. This generation process is directed to ensuring that the two screens will be “harmonically matched” where at least one of the fundamental frequency vectors and harmonics of the first screen will equal at least one of the fundamental frequency vectors and harmonics of the second screen.
摘要翻译：本文公开了一种用于生产增强的半色调边缘的图像处理方法，特别适合于仅靠在与其它半色调屏幕相邻的那些边缘上的背景的那些边缘。它利用定义边框像素的步骤和以与应用于色调或图像片段的内部区域的半色调不同的方式对这些边界像素进行半色调的步骤。边框像素的优选半色调将通过一些数量的共同空间频率谐波与内部半色调相关。用于边缘的共谐波筛选的示例包括但不限于：（a）具有不同色调再现特性（增强边缘值）的相同屏幕; （b）具有不同光点功能的相同屏幕角度和频率，可能相移; （c）可以通过内部画面的频率矢量生成频率矢量的点画面; （d）可以通过内部画面的频率矢量生成其频率矢量的行画面。该生成处理旨在确保两个屏幕将被“谐波匹配”，其中基本频率矢量和第一屏幕的谐波中的至少一个将等于第二屏幕的基本频率矢量和谐波中的至少一个。

2. 发明申请

US20060023258A1 Method for minimizing boundary defects using halftone classes with matched harmonics 审中-公开
标题翻译：使用具有匹配谐波的半色调类最小化边界缺陷的方法
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。

3. 发明申请

US20060152764A1 Systems and methods for controlling a tone reproduction curve using error diffusion 有权
标题翻译：使用误差扩散来控制色调再现曲线的系统和方法
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。

4. 发明申请

US20060132847A1 Systems and methods for rank-order error diffusion image processing 有权
标题翻译：用于秩序误差扩散图像处理的系统和方法
公开(公告)号：US20060132847A1
公开(公告)日：2006-06-22
申请号：US11013787
申请日：2004-12-17
申请人： Beilei Xu , David Lieberman , Robert Loce
发明人： Beilei Xu , David Lieberman , Robert Loce
IPC分类号： H04N1/40
CPC分类号： H04N1/4052
摘要： One aspect of the invention provides a method of halftoning an image which involves determining a quantization error for a selected target pixel of an image, selecting a diffusion mask, the mask relating to the target pixel and pixels neighboring thereto, receiving a first pair of neighboring pixel values for a first pixel pair including a first neighboring pixel and a second neighboring pixel, and receiving a second pair of neighboring pixel values for a second pixel pair including a third neighboring pixel and a fourth neighboring pixel. The method further involves determining a ranking order of the first, second, third and fourth neighboring pixels by comparing pixel values of the first, second, third and fourth neighboring pixels, and diffusing error to at least one of the first, second, third and fourth neighboring pixels based on the determined ranking order of the first, second, third and fourth neighboring pixels.
摘要翻译：本发明的一个方面提供了一种对图像进行半色调的方法，该方法涉及确定图像的所选目标像素的量化误差，选择扩散掩模，与目标像素相关的掩模和与其相邻的像素，接收第一对邻近包括第一相邻像素和第二相邻像素的第一像素对的像素值，以及接收包括第三相邻像素和第四相邻像素的第二像素对的第二对相邻像素值。该方法还包括通过比较第一，第二，第三和第四相邻像素的像素值来确定第一，第二，第三和第四相邻像素的排序顺序，以及将误差扩散到第一，第二，第三相邻像素和第四相邻像素中的至少一个，基于所确定的第一，第二，第三和第四相邻像素的排序顺序的第四相邻像素。

5. 发明申请

US20070147699A1 Corner sharpening using look-up table edge pixel identification 有权
标题翻译：使用查角表边缘像素识别的锐角锐化
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。

6. 发明申请

US20070146796A1 Tinted edge enhancement using look-up table edge pixel identification 失效
标题翻译：有色边缘增强使用查找表边缘像素识别
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。

7. 发明申请

US20060232822A1 Angle avoidance for color halftone screens 有权
标题翻译：角度回避颜色半色调屏幕
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。

8. 发明申请

US20060232798A1 Blended error diffusion and adaptive quantization 有权
标题翻译：混合误差扩散和自适应量化
公开(公告)号：US20060232798A1
公开(公告)日：2006-10-19
申请号：US11104758
申请日：2005-04-13
申请人： Beilei Xu , Robert Loce
发明人： Beilei Xu , Robert Loce
IPC分类号： G06F15/00
CPC分类号： H04N1/4052
摘要： A target pixel is processed according to a blended combination of two or more error diffusion techniques. For example, the two or more techniques may include a standard error diffusion technique and rank ordered error diffusion. Additionally, or alternatively, a quantization resolution is selected for the target pixel based on information regarding the pixel. For example, a quantization resolution is selected based on a relative position of the target pixel or based on a value of the target pixel and/or values of pixels neighboring the target pixel.
摘要翻译：根据两种或更多种误差扩散技术的混合组合来处理目标像素。例如，两种或多种技术可以包括标准误差扩散技术和等级有序误差扩散。另外或者替代地，基于关于像素的信息为目标像素选择量化分辨率。例如，基于目标像素的相对位置或者基于目标像素的值和/或与目标像素相邻的像素的值来选择量化分辨率。

9. 发明申请

US20060077468A1 System and method for smart color halftoning 审中-公开
标题翻译：智能彩色半色调的系统和方法
公开(公告)号：US20060077468A1
公开(公告)日：2006-04-13
申请号：US10962895
申请日：2004-10-12
申请人： Robert Loce , Beilei Xu
发明人： Robert Loce , Beilei Xu
IPC分类号： H04N1/405
CPC分类号： H04N1/4058
摘要： A method for halftoning a color image, the color image including a plurality of color separations, includes parsing the color image into image objects; examining each image object to determine its color content; for each color separation: determining a dominant color of the image object, wherein a dominant color of an image object is determined in accordance with a predetermined relationship based on a desired output image characteristic; selecting a halftone screen property to optimize for the desired output image characteristic; and selecting a halftone screen having the halftone screen property that is optimized for the dominant image object color and the desired image output characteristic; and halftoning the image object using the selected halftone screens. Using this method, halftone screens can be optimized based on screen angle, screen offset, screen frequency and dot shape.
摘要翻译：一种用于对彩色图像进行半色调的方法，包括多个分色的彩色图像包括将彩色图像解析为图像对象; 检查每个图像对象以确定其颜色内容; 对于每个颜色分离：确定图像对象的主要颜色，其中基于期望的输出图像特性根据预定关系确定图像对象的主色; 选择半色调屏幕属性以优化所需的输出图像特征; 以及选择具有针对主要图像对象颜色和期望图像输出特性优化的半色调屏幕特性的半色调屏幕; 并使用所选择的半色调屏幕对图像对象进行半色调处理。使用这种方法，可以基于屏幕角度，屏幕偏移，屏幕频率和点形状来优化半色调屏幕。

10. 发明申请

US20070147684A1 Edge pixel identification 失效
标题翻译：边缘像素识别
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。

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