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    DE-SCREENING OF HALFTONE USING SIGMA FILTER
    1.
    发明专利
    DE-SCREENING OF HALFTONE USING SIGMA FILTER 审中-公开

    公开(公告)号：JP2002312784A

    公开(公告)日：2002-10-25

    申请号：JP2002047374

    申请日：2002-02-25

    Applicant: IBM

    Inventor： KUO CHUNGKUI ,  RAO RAVISHANKAR ,  THOMPSON GERHARD R

    IPC: G06T5/20 ,  G06T5/00 ,  H04N1/40 ,  H04N1/409

    Abstract: PROBLEM TO BE SOLVED: To provide an improved system and method for substantially de- screening any type of color image. SOLUTION: A color image is de-screened by using two-stage sigma filters. The two-stage sigma filters can be used for converting a color halftone image into a continuous tone image regardless of used screening process. The two-stage sigma filters are constituted by using an O (N) algorithm for executing smoothing, and for simultaneously preserving edge information in red/green/ blur(RGB) color spaces. This system and method is able to fulfill double standards for completely removing halftone screen while preserving edge information so that higher performance can be expected than a conventional method using, for example, Gauss blur. When this system and method is combined with a halftone segmentation technology, a complete document processing algorithm for a variable density and color document is generated.

    METHOD AND SYSTEM FOR DESIGNING MULTILEVEL HALFTONE SCREENS USING SPOT FUNCTIONS
    2.
    发明申请
    METHOD AND SYSTEM FOR DESIGNING MULTILEVEL HALFTONE SCREENS USING SPOT FUNCTIONS 审中-公开
    使用SPOT功能设计多层HALFTONE屏幕的方法和系统

    公开(公告)号：WO2006135810A2

    公开(公告)日：2006-12-21

    申请号：PCT/US2006022628

    申请日：2006-06-09

    Applicant: IBM ,  LI HONG ,  STANICH MIKEL JOHN ,  THOMPSON GERHARD R ,  WU CHAI WAH

    Inventor： LI HONG ,  STANICH MIKEL JOHN ,  THOMPSON GERHARD R ,  WU CHAI WAH

    IPC: G06K15/00 ,  H04N1/405

    CPC classification number: H04N1/4055 ,  H04N1/40087

    Abstract: A method and system for generating halftone tables, using a spot function, subdivides the pixels within the halftone cell of a halftone matrix into a plurality of sub-pixels, determines the value of the spot function corresponding to the position of each of the sub-pixels within the halftone matrix, repeats the subdividing and determining for all of the sub-pixels in the halftone matrix, ranks the values for the entire halftone matrix, normalizes the ranked values, generates a cumulative histogram based upon the normalized values, and stores the cumulative histogram as a halftone table.

    Abstract translation: 使用点功能产生半色调表的方法和系统将半色调矩阵的半色调单元内的像素细分成多个子像素，确定与每个子像素的位置相对应的光点函数的值， 半色调矩阵内的像素重复细分和确定半色调矩阵中的所有子像素，对整个半色调矩阵的值进行排序，对排序的值进行归一化，基于归一化值生成累积直方图，并存储 累积直方图作为半色调表。

    ADJUSTING SUBPIXEL INTENSITY VALUES BASED UPON LUMINANCE CHARACTERISTICS OF THE SUBPIXELS IN LIQUID CRYSTAL DISPLAYS
    3.
    发明申请
    ADJUSTING SUBPIXEL INTENSITY VALUES BASED UPON LUMINANCE CHARACTERISTICS OF THE SUBPIXELS IN LIQUID CRYSTAL DISPLAYS 审中-公开
    基于液晶显示器中SUBPIXEL的发光特性调整SUBPIXEL强度值

    公开(公告)号：WO02059685A2

    公开(公告)日：2002-08-01

    申请号：PCT/US0149538

    申请日：2001-12-20

    Applicant: IBM

    Inventor： GREIER PAUL F ,  HO KENNETH C ,  KAUFMAN RICHARD I ,  MILLMAN STEVEN E ,  THOMPSON GERHARD R ,  WRIGHT STEVEN L ,  WU CHAI W

    IPC: G02F1/133 ,  G09G3/20 ,  G09G3/36 ,  G09G5/00 ,  G02F

    CPC classification number: G09G3/3611 ,  G09G3/2051 ,  G09G3/3614 ,  G09G5/006 ,  G09G2300/0443 ,  G09G2300/0447 ,  G09G2320/0276 ,  G09G2320/028

    Abstract: Viewing angle characteristics of a liquid crystal display (LCD) (112) are improved by reducing the number of subpixels in an image with mid-tone luminance values. In a preferred embodiment, a first table of entries associating subpixel intensity values and subpixel luminance values for a LCD in at least one viewing angle direction is provided. A target intensity value is determined from the first table, corresponding to the average subpixel luminance over a small number of adjacent subpixels. A second table of entries associates the target intensity values with intensity values above and below the target. The adjacent subpixel intensity values are modified according to the second table, thereby reducing the number of subpixels with mid-tone luminance values. The subpixel data is preferably processed within a portion of an application-specific integrated circuit (ASIC) (303), contained within the display module (112-2).

    Abstract translation: 通过用中间色调亮度值减少图像中的子像素的数量来改善液晶显示器（LCD）（112）的视角特性。 在优选实施例中，提供了将至少一个视角方向上的LCD的子像素强度值和子像素亮度值相关联的条目的第一表。 从第一表确定对应于少数相邻子像素上的平均子像素亮度的目标强度值。 第二个条目表将目标强度值与目标上方和下方的强度值相关联。 根据第二表修改相邻的子像素强度值，从而减少具有中间色调亮度值的子像素的数量。 子像素数据优选地在包含在显示模块（112-2）内的专用集成电路（ASIC）（303）的一部分内进行处理。

    SYSTEM FOR REPRODUCING MULTI-LEVEL DIGITAL IMAGES ON A BI-LEVEL PRINTER OF FIXED DOT SIZE
    8.
    发明专利
    SYSTEM FOR REPRODUCING MULTI-LEVEL DIGITAL IMAGES ON A BI-LEVEL PRINTER OF FIXED DOT SIZE 未知

    公开(公告)号：CA1248878A

    公开(公告)日：1989-01-17

    申请号：CA502705

    申请日：1986-02-25

    Applicant: IBM

    Inventor： GOERTZEL GERALD ,  THOMPSON GERHARD R

    IPC: G06F3/12 ,  B41J2/52 ,  G06K15/10 ,  H04N1/40 ,  H04N1/405 ,  H04N1/00

    Abstract: A system for producing improved halftone images from continuous tone input images, the pixels of which have been digitized as gray scale values, using a printer having the capability to print a set of output pel patterns producing a respective set of discrete gray scale values, is disclosed. Blocks of pel patterns with discrete gray scale values approximating the gray scale values of the input pixels are selected for printing, and the error in a first block due to the difference between the gray scale value associated with the block and the gray scale value of the corresponding input pixel, is determined. To diffuse this error it is distributed to at least two adjacent blocks using a random number generator to determine the distribution such that a random fraction of said error is distributed to one block and the remainder is distributed to the other block. This error diffusion process is carried through the adjacent blocks taking into account the error fraction already assigned. For edge enhancement the brightness gradient surrounding each input pixel is determined and a threshold value is set below which said gradient is classified as small and above which it is classified as large. When said gradient is small, the selected discrete pattern is printed for the pixel, and when said gradient is large, the pel pattern is altered and the block representing the pixel is printed biasing the pels therein toward the darker input pixels.

    FIRST IN - FIRST OUT MEMORY ARRAY CONTAINING SPECIAL BITS FOR REPLACEMENT ADDRESSING
    9.
    发明专利
    FIRST IN - FIRST OUT MEMORY ARRAY CONTAINING SPECIAL BITS FOR REPLACEMENT ADDRESSING 未知

    公开(公告)号：CA1080366A

    公开(公告)日：1980-06-24

    申请号：CA281835

    申请日：1977-06-30

    Applicant: IBM

    Inventor： CAMPBELL JOHN E ,  THOMPSON GERHARD R

    IPC: G11C7/00 ,  G06F5/06 ,  G06F12/12 ,  H03M7/16 ,  G11C8/00

    Abstract: FIRST IN - FIRST OUT MEMORY ARRAY CONTAINING SPECIAL BITS FOR REPLACEMENT ADDRESSING A first in - first out auxiliary memory array for storing binary data wherein each member (word) of the array includes a special bit which is used in combination with the special bits of the other members comprising the same member set to form the address of the next member whose data is to be replaced. Each member comprises an identifier field, a data field and the aforementioned special bit. When a member set is addressed, each member of the set is read to determine whether there is a match on the respective identifier field. If there is a match, the data field of the same member is utilized. If there is no match on the identifier field of any member of the addressed set, the main memory is accessed for the necessary replacement information which is to be written into the member which contains the oldest data. The address of the last-named member is determined by the exclusive ORing of the special bits of all the members comprising the given set. When the replacement data is written into the addressed member, the state of the special bit thereof is inverted. The inverted state of the special bit is written into the member simultaneously with the writing in of the replacement data.

    10.
    发明专利
    未知

    公开(公告)号：FR2357036A1

    公开(公告)日：1978-01-27

    申请号：FR7717615

    申请日：1977-06-02

    Applicant: IBM

    Inventor： CAMPBELL JOHN E ,  THOMPSON GERHARD R

    IPC: G11C7/00 ,  G06F5/06 ,  G06F12/12 ,  H03M7/16 ,  G11C15/04

    Abstract: 1533831 FIFO storage INTERNATIONAL BUSINESS MACHINES CORP 13 June 1977 [2 July 1976] 24608/77 Heading G4A Each storage area 0-7 has a marker bit a-h, an encoding (EXOR) circuit 10 produces from the marker bits an indication of which storage area was the first to be loaded, and each time a storage area is loaded its marker bit is inverted, whereby the encoding circuit identifies the storage areas in a predetermined cyclic sequence. The encoding circuit shown produces coded bit combinations ABC in Gray code sequence when the marker bits are set from 0 to 1 in the order a, b, d, c, g, h, f, e and are subsequently reset from 1 to 0 in the same order as successive storage areas are loaded (overwriting occurring after the first sequence). The FIFO store may form the cache memory of a multilevel storage system, the output of circuit 10 being decoded to select the storage area to receive replacement data from main storage when the requested data is not present in the cache.

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