Prioritized PDL segmentation producing two bit selector
    1.
    发明申请
    Prioritized PDL segmentation producing two bit selector 有权
    优先PDL分段产生两位选择器

    公开(公告)号:US20040052421A1

    公开(公告)日:2004-03-18

    申请号:US10612057

    申请日:2003-07-01

    申请人: Xerox Corporation

    IPC分类号: G06K009/36 G06K009/54

    摘要: A method of generating a binary Sel plane for image compression is disclosed. The method first generates a 2 bit gray selector (GraySel). This 2 bit selector is then processed in a second stage to produce a binary Sel decision which minimizes the compression noise evident in the reconstructed image. The method used here to generate the 2 bit GraySel applies a set of prioritized rules over a small 3null3 window that is well suited for segmenting synthetic, PDL generated images that are typically free of scanner noise. The method not only marks the proper sense of the selector when it is known, but also include a 3rd state that indicates that the selector decision is weak or unknown. This weak decision can then be optimized in the second stage process based on strong edges information in the neighborhood.

    摘要翻译: 公开了一种生成用于图像压缩的二进制Sel平面的方法。 该方法首先生成一个2位灰色选择器(GraySel)。 然后,该2位选择器在第二级中被处理以产生使得在重构图像中显而易见的压缩噪声最小化的二进制Sel判定。 这里用于生成2位GraySel的方法在一个小的3x3窗口上应用一组优先级规则,非常适合分割通常没有扫描仪噪声的合成PDL生成的图像。 该方法在已知时不仅标示选择器的适当感觉,而且还包括指示选择器判定为弱或未知的3状态。 然后可以在基于邻域中的强边缘信息的第二阶段过程中优化该弱决策。

    Segmentation method and system for Multiple Raster Content (MRC) representation of documents
    2.
    发明申请
    Segmentation method and system for Multiple Raster Content (MRC) representation of documents 有权
    文档的多光栅内容(MRC)表示的分段方法和系统

    公开(公告)号:US20040052416A1

    公开(公告)日:2004-03-18

    申请号:US10612368

    申请日:2003-07-01

    申请人: Xerox Corporation

    摘要: A method and a system for dynamically thresholding an image signal. The system comprises a computing block. The computing block receives the image signal and a minimum and a maximum within each of a set of windows centered on the current pixel in the image signal, and computes, for each of the windows, based on the current pixel and the respective minimum and maximum, a respective indicator representing the distance and direction of the current pixel relative to a respective threshold plane, and outputs a control signal based on the indicators.

    摘要翻译: 一种用于动态阈值化图像信号的方法和系统。 该系统包括计算块。 计算块在图像信号中以当前像素为中心的一组窗口的每一个的每一个中接收图像信号,并且接收最小和最大值,并且基于当前像素和相应的最小和最大值来计算每个窗口 ,表示当前像素相对于相应阈值平面的距离和方向的相应指示符,并且基于指示符输出控制信号。

    Dynamic threshold system for multiple raster content (MRC) representation of documents
    3.
    发明申请
    Dynamic threshold system for multiple raster content (MRC) representation of documents 失效
    用于多个光栅内容(MRC)表示文档的动态阈值系统

    公开(公告)号:US20040001648A1

    公开(公告)日:2004-01-01

    申请号:US10188277

    申请日:2002-07-01

    申请人: Xerox Corporation

    IPC分类号: G06K009/54 G06K009/36

    摘要: A method and a system for dynamically thresholding an image signal. The system comprises a computing block. The computing block receives the image signal and a minimum and a maximum within each of a set of windows centered on the current pixel in the image signal, and computes, for each of the windows, based on the current pixel and the respective minimum and maximum, a respective indicator representing the distance and direction of the current pixel relative to a respective threshold plane, and outputs a control signal based on the indicators.

    摘要翻译: 一种用于动态阈值化图像信号的方法和系统。 该系统包括计算块。 计算块在图像信号中以当前像素为中心的一组窗口的每一个的每一个中接收图像信号,并且接收最小和最大值,并且基于当前像素和相应的最小和最大值来计算每个窗口 ,表示当前像素相对于相应阈值平面的距离和方向的相应指示符,并且基于指示符输出控制信号。

    Segmentation method and system for Multiple Raster Content (MRC) representation of documents
    5.
    发明申请
    Segmentation method and system for Multiple Raster Content (MRC) representation of documents 失效
    文档的多光栅内容(MRC)表示的分段方法和系统

    公开(公告)号:US20040001625A1

    公开(公告)日:2004-01-01

    申请号:US10188249

    申请日:2002-07-01

    申请人: Xerox Corporation

    IPC分类号: G06K009/34

    摘要: A method and a system for separating an image signal into a set of image planes. The system comprises a min-max module, a dynamic threshold module and a separation module. The min-max module receives the image signal, searches for a minimum and maximum within at least one window centered on a current pixel in the image signal. The dynamic threshold module computes, for the window, based on the respective minimum and maximum received from the min-max module and the current pixel, a respective indicator representing the distance and direction of the current pixel relative to a respective threshold plane, and outputs a control signal based on the indicator. The separation module separates the image signal into the set of image planes in accordance with the control signal by including a representation of the current pixel in at least one of the image planes.

    摘要翻译: 一种用于将图像信号分离成一组图像平面的方法和系统。 该系统包括最小 - 最大模块,动态阈值模块和分离模块。 最小 - 最大模块接收图像信号,在以图像信号中的当前像素为中心的至少一个窗口内搜索最小和最大值。 动态阈值模块基于从最小 - 最大模块和当前像素接收的相应最小值和最大值来计算窗口,表示当前像素相对于相应阈值平面的距离和方向的相应指示符,并且输出 基于指示器的控制信号。 分离模块通过在至少一个图像平面中包括当前像素的表示,根据控制信号将图像信号分离成图像平面。

    Digital de-screening of documents
    6.
    发明申请
    Digital de-screening of documents 失效
    数字去筛选文件

    公开(公告)号:US20040001234A1

    公开(公告)日:2004-01-01

    申请号:US10187499

    申请日:2002-07-01

    申请人: Xerox Corporation

    IPC分类号: H04N001/409 G06T005/00

    CPC分类号: H04N1/40075

    摘要: A method and a system for de-screening an image signal. The system comprises a filter bank, a control module and a blend module. The filter bank filters the image signal and produces a set of filter output signals. The control module generates at least one control signal based on the image signal and some of the filter output signals. The blend module dynamically blends the filter output signals in accordance with the control signal to produce a de-screened output signal.

    摘要翻译: 一种用于去除图像信号的方法和系统。 该系统包括过滤器组,控制模块和混合模块。 滤波器组滤除图像信号并产生一组滤波器输出信号。 控制模块基于图像信号和一些滤波器输出信号产生至少一个控制信号。 混合模块根据控制信号动态地混合滤波器输出信号以产生去屏蔽的输出信号。

    Scan color conversion method
    7.
    发明申请
    Scan color conversion method 有权
    扫描颜色转换方法

    公开(公告)号:US20040056835A1

    公开(公告)日:2004-03-25

    申请号:US10612261

    申请日:2003-07-01

    申请人: Xerox Corporation

    IPC分类号: G09G003/36

    CPC分类号: H04N1/6019 H04N1/41 H04N1/646

    摘要: A method and a system for computing the function value of an input node based on function values of known nodes. A database of known nodes and their corresponding function values is formed. The known nodes are located such that a distance between any two adjacent known nodes is an integer power-of-two number. The database is searched for a first node such that the input node is located between the first node and an adjacent second node. The difference null between the input node and the first node is computed. Then null is shifted to the right by k positions, k being the logarithm in base 2 of the distance between the first and second nodes. The input node function value is computed by combining the first node function value with the product of the shifted null and the difference between the function values of the second and first nodes. When used in MRC context, the above method and system is applied to each of the color MRC planes individually, instead of the merged output. The resulting performance is approved since most if not all of the color MRC planes are sub-sampled.

    摘要翻译: 一种基于已知节点的功能值计算输入节点的功能值的方法和系统。 形成已知节点的数据库及其对应的功能值。 已知节点被定位成使得任何两个相邻的已知节点之间的距离是二进制数的整数。 搜索数据库以获得第一节点,使得输入节点位于第一节点和相邻的第二节点之间。 计算输入节点和第一个节点之间的差异增量。 然后,δ向右移动k个位置,k是第一和第二个节点之间的距离的基数2中的对数。 输入节点功能值是通过将第一个节点功能值与移位的增量的乘积和第二个和第一个节点的功能值的差值相结合来计算的。 当在MRC上下文中使用时,将上述方法和系统单独地应用于每个彩色MRC平面,而不是合并的输出。 所得到的性能被批准,因为大多数(如果不是全部)彩色MRC平面都被子采样。

    Background suppression and color adjustmet method
    8.
    发明申请
    Background suppression and color adjustmet method 有权
    背景抑制和颜色调整方法

    公开(公告)号:US20040052429A1

    公开(公告)日:2004-03-18

    申请号:US10612461

    申请日:2003-07-01

    申请人: Xerox Corporation

    IPC分类号: G06K009/40 G06K009/54

    摘要: A Gamut Enhance Module (GME) is disclosed for applying 3 independent Tone Reproduction Curves (TRC) to each of the color components of an input image. The implementation is done via three independent and fully programmable 1D lookup tables. The input to the Gamut Enhance Module is the output DSS from a Scaling Module (SCL), representing a scaled and de-screened version of the source image. The output is a gamut-mapped signal GME. The GME unit includes special logic to neutralize (set to gray) or preserve input colors.

    摘要翻译: 公开了一种色域增强模块(GME),用于将3个独立的色调再现曲线(TRC)应用于输入图像的每个颜色分量。 该实现通过三个独立且完全可编程的1D查找表完成。 色域增强模块的输入是来自缩放模块(SCL)的输出DSS,表示源图像的缩放和去屏蔽版本。 输出是色域映射信号GME。 GME单元包括中和(设置为灰色)或保留输入颜色的特殊逻辑。

    Control system for digital de-screening of documents
    9.
    发明申请
    Control system for digital de-screening of documents 失效
    数字解除档案的控制系统

    公开(公告)号:US20040001642A1

    公开(公告)日:2004-01-01

    申请号:US10188026

    申请日:2002-07-01

    申请人: Xerox Corporation

    IPC分类号: G06K009/40

    摘要: A method and a system for controlling de-screening of documents. The control system is included in a de-screening system including a bank of filters. The filter bank receives an image signal and produces a set of filter output signals. The control system comprises a contrast module, a halftone estimate module and a pixel control module. The contrast module receives a filter output signal from a filter having a large filter span and produces a contrast signal. The halftone estimate module receives the image signal and a filter output signal from a filter having a small filter span and produces an estimated frequency signal and a halftone weight signal. Based on the contrast signal, the estimated frequency signal and the halftone weight signal, the pixel control module produces a control signal which includes information regarding which of the filter output signals are to be blended and the proportion of blending.

    摘要翻译: 一种用于控制文件的筛选的方法和系统。 控制系统包括在一个包括一组过滤器的去筛选系统中。 滤波器组接收图像信号并产生一组滤波器输出信号。 控制系统包括对比度模块,半色调估计模块和像素控制模块。 对比度模块从具有较大滤波器跨度的滤波器接收滤波器输出信号并产生对比度信号。 半色调估计模块从具有小滤波器跨度的滤波器接收图像信号和滤波器输出信号,并产生估计的频率信号和半色调加权信号。 基于对比度信号,估计的频率信号和半色调加权信号,像素控制模块产生一个控制信号,该控制信号包括关于要混合哪个滤波器输​​出信号的信息和混合比例。

    Template matching applied to selector planes for multiple raster content (MRC) representation of documents
    10.
    发明申请
    Template matching applied to selector planes for multiple raster content (MRC) representation of documents 有权
    模板匹配应用于文档的多个栅格内容(MRC)表示的选择器平面

    公开(公告)号:US20040114832A1

    公开(公告)日:2004-06-17

    申请号:US10320825

    申请日:2002-12-16

    申请人: Xerox Corporation

    IPC分类号: G06K009/32 G06K009/54

    摘要: A method and a system for separating an image signal into a set of image planes are disclosed. The system comprises a way to perform resolution conversion from low resolution to high resolution binary images either for synthetic or scanned imagery by using template matching with pattern replacement. More specifically, the invention applies resolution conversion to the selector plane of mixed raster content images. For selector planes in which edges are encoded (vs. region classification), template matching/pattern replacement works well, and does not affect halftoned regions, as they are not encoded in this image.

    摘要翻译: 公开了一种用于将图像信号分离成一组图像平面的方法和系统。 该系统包括通过使用与模式替换的模板匹配来执行用于合成或扫描图像的从低分辨率到高分辨率二进制图像的分辨率转换的方法。 更具体地,本发明将分辨率转换应用于混合光栅内容图像的选择器平面。 对于编码边缘(与区域分类)的选择器平面,模板匹配/图案替换工作良好,并且不会影响半色调区域,因为它们未在此图像中编码。