公开(公告)号：US20020093686A1

公开(公告)日：2002-07-18

申请号：US09731131

申请日：2000-12-06

Applicant: XEROX CORPORATION

Inventor： Zhigang Fan ,  Ying-Wei Lin ,  Hong Li

IPC: H04N001/405 ,  G06K015/00 ,  G06T005/00

CPC classification number: H04N1/40075

Abstract: An adaptive filtering method and apparatus for descreening a scanned halftoned image representation is disclosed. The apparatus includes an image input subsystem; a processing subsystem for processing halftoned image data provided by the image input subsystem; and software/firmware means operative on the processing subsystem for a) low-pass filtering a halftoned input pixel value provided by the image input subsystem to produce a low-pass filtered pixel value; b) notch-filtering the halftoned input pixel value to produce a notch-filtered pixel value; c) determining a local contrast value for the halftoned input pixel value; and d) producing a descreened output pixel value based on the low-pass filtered pixel value, the notch-filtered pixel value, or a combination of the low-pass filtered pixel value and the notch-filtered pixel value depending on the local contrast value.

Abstract translation: 公开了一种用于对已扫描的半色调图像表示进行去网的自适应滤波方法和装置。 该装置包括图像输入子系统; 用于处理由图像输入子系统提供的半色调图像数据的处理子系统; 以及在所述处理子系统上操作的软件/固件，用于a）对由所述图像输入子系统提供的半色调输入像素值进行低通滤波以产生低通滤波像素值; b）对所述半色调输入像素值进行陷波滤波以产生陷波经滤波的像素值; c）确定半色调输入像素值的局部对比度值; 以及d）基于所述低通滤波像素值，所述陷波经滤波的像素值或者根据所述局部对比度值的所述低通滤波像素值和所述陷波经滤波的像素值的组合来产生去网输出像素值 。

公开(公告)号：US20030063803A1

公开(公告)日：2003-04-03

申请号：US09965880

申请日：2001-09-28

Applicant: Xerox Corporation

Inventor： Ying-Wei Lin ,  Stuart A. Schweid ,  Jeng-Nan Shiau ,  Raja Bala ,  Zhigang Fan

IPC: G06K009/00

CPC classification number: H04N1/40062 ,  G06K9/00456

Abstract: A method and system for image processing, in conjunction with classification of images between natural pictures and synthetic graphics, using SGLD texture (e.g., variance, bias, skewness, and fitness), color discreteness (e.g., R_L, R_U, and R_V normalized histograms), or edge features (e.g., pixels per detected edge, horizontal edges, and vertical edges) is provided. In another embodiment, a picture/graphics classifier using combinations of SGLD texture, color discreteness, and edge features is provided. In still another embodiment, a nullsoftnull image classifier using combinations of two (2) or more SGLD texture, color discreteness, and edge features is provided. The nullsoftnull classifier uses image features to classify areas of an input image in picture, graphics, or fuzzy classes.

Abstract translation: 一种用于图像处理的方法和系统，结合使用SGLD纹理（例如，方差，偏差，偏度和适应度）的自然图像和合成图像之间的图像分类，颜色离散性（例如，R_L，R_U和R_V归一化直方图 ）或边缘特征（例如，每个检测到的边缘的像素，水平边缘和垂直边缘）。 在另一个实施例中，提供了使用SGLD纹理，颜色离散性和边缘特征的组合的图片/图形分类器。 在另一个实施例中，提供了使用两（2）或更多SGLD纹理，颜色离散性和边缘特征的组合的“软”图像分类器。 “软”分类器使用图像特征来对图像，图形或模糊类中的输入图像的区域进行分类。

公开(公告)号：US20020076103A1

公开(公告)日：2002-06-20

申请号：US09737515

申请日：2000-12-15

Applicant: XEROX CORPORATION

Inventor： Ying-Wei Lin ,  Martin E. Banton ,  William A. Fuss

IPC: G06K009/34

CPC classification number: G06K9/00456 ,  G06T7/11 ,  G06T7/174 ,  G06T2207/10008 ,  G06T2207/30176 ,  H04N1/40062 ,  H04N1/41

Abstract: This invention relates to a method and apparatus for segmenting an image using a combination of image segmentation techniques. More particularly, the invention is directed to an improved image segmentation technique for use in an image processing system that performs at least two distinct image segmentation processes on an image and combines the results to obtain a combined multi-layer representation of the image that can be suitably processed. In a specific example, a block based segmentation technique is performed on an image to generate a MRC (mixed raster content) representationnullhaving foreground, background and selector layers. A pixel based segmentation technique is also performed on the image to generate rendering hints. The MRC representation and the rendering hints are then combined to obtain a four (4) layer representation of the image. The four layer representation is subsequently processed as required by the image processing system, e.g. compressed and stored.

Abstract translation: 本发明涉及使用图像分割技术的组合分割图像的方法和装置。 更具体地，本发明涉及一种用于在图像处理系统中使用的改进的图像分割技术，该图像处理系统对图像执行至少两个不同的图像分割处理，并且将结果组合以获得图像的组合多层表示，其可以是 适当加工。 在具体示例中，对图像执行基于块的分割技术以生成具有前景，背景和选择器层的MRC（混合光栅内容）表示。 还对图像执行基于像素的分割技术以产生渲染提示。 然后组合MRC表示和渲染提示以获得图像的四（4）层表示。 随后根据图像处理系统的要求对四层表示进行处理。 压缩并存储。

公开(公告)号：US20020031268A1

公开(公告)日：2002-03-14

申请号：US09965922

申请日：2001-09-28

Applicant: XEROX CORPORATION

Inventor： Salil Prabhakar ,  Hui Cheng ,  Zhigang Fan ,  John C. Handley ,  Ying-Wei Lin

IPC: G06K009/62

CPC classification number: G06K9/00456

Abstract: A method and system for image processing, in conjunction with classification of images between natural pictures and synthetic graphics, using SGLD texture (e.g., variance, bias, skewness, and fitness), color discreteness (e.g., R_L, R_U, and R_V normalized histograms), or edge features (e.g., pixels per detected edge, horizontal edges, and vertical edges) is provided. In another embodiment, a picture/graphics classifier using combinations of SGLD texture, color discreteness, and edge features is provided. In still another embodiment, a nullsoftnull image classifier using combinations of two (2) or more SGLD texture, color discreteness, and edge features is provided. The nullsoftnull classifier uses image features to classify areas of an input image in picture, graphics, or fuzzy classes.

Abstract translation: 一种用于图像处理的方法和系统，结合使用SGLD纹理（例如，方差，偏差，偏度和适应度）的自然图像和合成图像之间的图像分类，颜色离散性（例如，R_L，R_U和R_V归一化直方图 ）或边缘特征（例如，每个检测到的边缘的像素，水平边缘和垂直边缘）。 在另一个实施例中，提供了使用SGLD纹理，颜色离散性和边缘特征的组合的图片/图形分类器。 在另一个实施例中，提供了使用两（2）或更多SGLD纹理，颜色离散性和边缘特征的组合的“软”图像分类器。 “软”分类器使用图像特征来对图像，图形或模糊类中的输入图像的区域进行分类。

公开(公告)号：US20030206307A1

公开(公告)日：2003-11-06

申请号：US10137677

申请日：2002-05-02

Applicant: XEROX CORPORATION

Inventor： John C. Handley ,  Ying-Wei Lin

IPC: H04N001/60

CPC classification number: H04N1/56 ,  G01J3/462

Abstract: A method for neutral pixel detection using color space feature vectors wherein one color space coordinate represents lightness is provided. The method includes the following steps: a) receiving an input image represented in a first color space; b) converting the input image to a second color space wherein one coordinate represents lightness; c) selecting a pixel in the second color space representation to be classified; d) computing second color space feature vectors associated with the selected pixel; and e) classifying the selected pixel between neutral and color classes based on the values computed for the second color space feature vectors. Typically, the input image is processed using a smoothing filter to create a smoothed input image prior to the conversion to the second color space. The method can be adapted to page processing or strip processing schemes with respect to the input image.

Abstract translation: 提供使用颜色空间特征向量进行中性像素检测的方法，其中一个颜色空间坐标表示亮度。 该方法包括以下步骤：a）接收在第一颜色空间中表示的输入图像; b）将输入图像转换为第二颜色空间，其中一个坐标表示亮度; c）选择要分类的第二颜色空间表示中的像素; d）计算与所选择的像素相关联的第二颜色空间特征向量; 以及e）基于为第二颜色空间特征向量计算的值，对所选择的像素在中性色和类之间进行分类。 通常，使用平滑滤波器处理输入图像，以在转换到第二颜色空间之前创建平滑的输入图像。 该方法可适用于相对于输入图像的页面处理或条带处理方案。

公开(公告)号：US20010038460A1

公开(公告)日：2001-11-08

申请号：US09870304

申请日：2001-05-30

Applicant: Xerox Corporation

Inventor： Robert P. Loce ,  Michael Branciforte ,  Ying-Wei Lin

IPC: B41B001/00

CPC classification number: G06T5/20 ,  H04N1/58

Abstract: A method for processing digital images to be displayed, stored, or printed, to eliminate blooming and other artifacts. The system utilizes morphological processes to isolate and modify image structures susceptible to marking process artifacts and then combines the modified image structures with the input image to produce a printable image that may be rendered on a given printer.