Method and apparatus for learning and switching frames in a distributed network switch
    1.
    发明授权
    Method and apparatus for learning and switching frames in a distributed network switch 有权
    分布式网络交换机学习和切换帧的方法和装置

    公开(公告)号:US06807172B1

    公开(公告)日:2004-10-19

    申请号:US09469459

    申请日:1999-12-21

    IPC分类号: H04L1228

    摘要: A technique enables learning and switching of frames between line cards that are interconnected by a switch fabric of a distributed network switch. The network switch comprises a router and a plurality of forwarding engines, each having an associated forwarding table. The distributed learning and switching technique configures (i) the router to issue an extra copy of a routed frame to an ingress card having a port attached to the source of the frame; (ii) the router to ensure that the contents of a source index field of the routed frame header indicate that the frame originated from the ingress card; (iii) the router to assert a shortcut bit in the header of the routed frame; (iv) a forwarding engine on an egress card having a port attached to the destination of the frame to generate and issue a media access control notification frame to the ingress card and (v) a forwarding engine on the ingress card to mark an established entry in a layer 2 (L2) portion of its forwarding table as ineligible for normal L2 aging policies.

    摘要翻译: 一种技术能够在由分布式网络交换机的交换结构互连的线路卡之间学习和切换帧。 网络交换机包括路由器和多个转发引擎,每个转发引擎具有相关联的转发表。 分布式学习和切换技术配置(i)路由器向已经连接到帧的源的端口的入口卡发布路由帧的额外副本; (ii)路由器,以确保路由帧头的源索引字段的内容指示帧来自入口卡; (iii)路由器在路由帧的头部中断言快捷位; (iv)在出口卡上的转发引擎,其具有连接到帧的目的地的端口,以生成并向入口卡发布媒体访问控制通知帧,以及(v)在入口卡上的转发引擎来标记已建立的条目 在其转发表的第2层(L2)部分不符合正常的L2老化策略。

    Enhanced error diffusion by using peak position profiles
    4.
    发明授权
    Enhanced error diffusion by using peak position profiles 有权
    通过使用峰值位置分布来增强误差扩散

    公开(公告)号:US06552823B1

    公开(公告)日:2003-04-22

    申请号:US09323583

    申请日:1999-06-01

    申请人: Chingwei Chang

    发明人: Chingwei Chang

    IPC分类号: H04N140

    CPC分类号: H04N1/4052

    摘要: A method for enhanced error diffusion. The method includes the steps of selecting values for a first level of peak positions, placing these peak positions in selected positions of a matrix, creating a peak position profile. The peak position profiles are then used to adjust the error threshold by applying the peak position profile. The profiled error threshold is then used to calculate error for the current input pixel value and the resulting error is diffused to the neighbors of the current pixel.

    摘要翻译: 一种增强误差扩散的方法。 该方法包括以下步骤:选择峰值位置的第一级的值,将这些峰值位置放置在矩阵的选定位置,创建峰值位置分布。 峰值位置分布然后用于通过应用峰值位置分布来调整误差阈值。 然后使用异形误差阈值来计算当前输入像素值的误差,并将所得到的误差扩散到当前像素的邻居。

    Enhanced error diffusion by using directional guided line thresholding
    5.
    发明授权
    Enhanced error diffusion by using directional guided line thresholding 有权
    通过使用方向导向线阈值增强的误差扩散

    公开(公告)号:US06496603B1

    公开(公告)日:2002-12-17

    申请号:US09246263

    申请日:1999-02-08

    申请人: Chingwei Chang

    发明人: Chingwei Chang

    IPC分类号: H04N140

    摘要: A method for error diffusion in digital printing. The method selects a base threshold value for printing of digital data, determines an offset value, and then calculates at least two threshold values from the base threshold value and the offset value. The thresholds are applied to the image along directional guided threshold lines, with each set of lines for each color having a unique angle to the lines for the other colors. The error diffusion process does not result in objectionable artifacts.

    摘要翻译: 数字印刷中误差扩散的方法。 该方法选择用于打印数字数据的基本阈值,确定偏移值,然后从基本阈值和偏移值计算至少两个阈值。 阈值通过定向引导的阈值线应用于图像,每组颜色的每组线对于其它颜色的线具有唯一的角度。 错误扩散过程不会导致令人反感的伪像。

    Photo quality color printing by using light black ink
    8.
    发明授权
    Photo quality color printing by using light black ink 有权
    使用浅黑色墨水进行照片质量彩色打印

    公开(公告)号:US06765693B1

    公开(公告)日:2004-07-20

    申请号:US09527887

    申请日:2000-03-20

    申请人: Chingwei Chang

    发明人: Chingwei Chang

    IPC分类号: G06K1502

    摘要: A method for printing images using light black ink. The method sets a first and second threshold determined by an intensity value of the light black ink relative to standard black ink. The method then determines a gray component density value for a pixel, calculates a black generation value based upon the first and second thresholds and then generates values for other colors dependent upon the black generation value.

    摘要翻译: 一种使用浅黑色墨水打印图像的方法。 该方法设置由相对于标准黑色墨水的浅黑色墨水的强度值确定的第一和第二阈值。 然后,该方法确定像素的灰度分量密度值,基于第一和第二阈值计算黑色生成值,然后根据黑色生成值生成其他颜色的值。