公开(公告)号：JP2003101779A

公开(公告)日：2003-04-04

申请号：JP2002194034

申请日：2002-07-03

Applicant: IBM

Inventor： TRELEWICZ JENNIFER QUIRIN ,  DITTRICH DANIELLE K ,  QIAO YUE ,  THOMPSON GERHARD ROBERT ,  WU CHAI WAH

IPC: B41J2/52 ,  G06K15/02 ,  H04N1/405

Abstract: PROBLEM TO BE SOLVED: To provide technique to realize digital half tone which controls a spot function in order to cope with gear noise, printer stress and general printing quality. SOLUTION: A method for forming spots to be used for realizing half tone includes a step for defining a spot function combining two functions which are selected in order to provide a prescribed spot form to be used in a half tone cell, and a step for scaling the spot function by using a scaling function which changes in accordance with values of a first spot function ordinate and a second spot function ordinate. By using asymmetrical modulation of the spot function, contact of adjacent spots is controlled, and a form of the spot accompanied by a gray region is changed.

公开(公告)号：WO2005120041A3

公开(公告)日：2007-07-05

申请号：PCT/US2005016184

申请日：2005-05-10

Applicant: IBM ,  STANICH MIKEL JOHN ,  THOMPSON GERHARD ROBERT ,  TRESSER CHARLES P ,  WU CHAI WAH

Inventor： STANICH MIKEL JOHN ,  THOMPSON GERHARD ROBERT ,  TRESSER CHARLES P ,  WU CHAI WAH

IPC: H04N1/405

CPC classification number: H04N1/4051

Abstract: Techniques for generating dither masks are provided. A dither mask is generated by selecting a sequence of at least three original patterns comprising pixels of at least one of a first color and a second color. At least two patterns are interpolated to generate interpolated patterns in the sequence between the at least three original patterns. If a pattern having at least one specified characteristic exists in the sequence, the steps of interpolating between at least two patterns, and determining if a pattern having at least one specified characteristic exists in the sequence, are repeated. The interpolation is between at least one pattern from each side of the pattern having at least one specified characteristic in the sequence.

Abstract translation: 提供了产生抖动掩模的技术。 通过选择至少三个包括第一颜色和第二颜色中的至少一个的像素的原始图案的序列来生成抖动掩模。 内插至少两个图案以在至少三个原始图案之间的序列中生成插值图案。 如果序列中存在至少一个特定特征的图案，则重复在至少两个图案之间进行内插并确定序列中是否存在具有至少一个指定特征的图案的步骤。 该插值位于具有序列中至少一个特定特征的图案的每侧的至少一个图案之间。

公开(公告)号：DE3686307D1

公开(公告)日：1992-09-10

申请号：DE3686307

申请日：1986-10-17

Applicant: IBM

Inventor： PRUETT DAVID RAYMOND ,  GOERTZEL GERALD ,  THOMPSON GERHARD ROBERT

IPC: G06T3/60 ,  G06F15/62

公开(公告)号：DE3686307T2

公开(公告)日：1993-03-18

申请号：DE3686307

申请日：1986-10-17

Applicant: IBM

Inventor： PRUETT DAVID RAYMOND ,  GOERTZEL GERALD ,  THOMPSON GERHARD ROBERT

IPC: G06T3/60 ,  G06F15/62

公开(公告)号：DE3278335D1

公开(公告)日：1988-05-19

申请号：DE3278335

申请日：1982-05-05

Applicant: IBM

Inventor： KAUFMAN DAN RAUL ,  THOMPSON GERHARD ROBERT

IPC: G06F7/00 ,  G06F7/501 ,  G06F7/503 ,  G06F7/575 ,  H03K19/20 ,  H03K19/21 ,  G06F7/38

公开(公告)号：DE2725396A1

公开(公告)日：1978-01-05

申请号：DE2725396

申请日：1977-06-04

Applicant: IBM

Inventor： CAMPBELL JOHN EDWARD ,  THOMPSON GERHARD ROBERT

IPC: G11C7/00 ,  G06F5/06 ,  G06F12/12 ,  H03M7/16 ,  G11C9/00 ,  G06F13/06

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.

公开(公告)号：CA2568500C

公开(公告)日：2012-11-20

申请号：CA2568500

申请日：2005-05-10

Applicant: IBM

Inventor： STANICH MIKEL JOHN ,  THOMPSON GERHARD ROBERT ,  TRESSER CHARLES P ,  WU CHAI WAH

IPC: H04N1/405

Abstract: Techniques for generating dither masks are provided. A dither mask is generated by selecting a sequence of at least three original patterns comprising pixels of at least one of a first color and a second color. At least two patterns are interpolated to generate interpolated patterns in the sequence between the at least three original patterns. If a pattern having at least one specified characteristic exists in the sequence, the steps of interpolating between at least two patterns, and determining if a pattern having at least one specified characteristic exists in the sequence, are repeated. The interpolation is between at least one pattern from each side of the pattern having at least one specified characteristic in the sequence.

公开(公告)号：CA2568500A1

公开(公告)日：2005-12-15

申请号：CA2568500

申请日：2005-05-10

Applicant: IBM

Inventor： WU CHAI WAH ,  STANICH MIKEL JOHN ,  TRESSER CHARLES P ,  THOMPSON GERHARD ROBERT

IPC: H04N1/405

Abstract: Techniques for generating dither masks are provided. A dither mask is generated by selecting a sequence of at least three original patterns comprising pixels of at least one of a first color and a second color. At least two patterns are interpolated to generate interpolated patterns in the sequence between the at least three original patterns. If a pattern having at least one specified characteristic exists in the sequence, the steps of interpolating between at least two patterns, and determining if a pattern having at least one specified characteristic exists in the sequence, are repeated. The interpolation is between at least one pattern from each side of the pattern having at least one specified characteristic in the sequence.

公开(公告)号：DE3674943D1

公开(公告)日：1990-11-22

申请号：DE3674943

申请日：1986-02-28

Applicant: IBM

Inventor： GOERTZEL GERALD ,  THOMPSON GERHARD ROBERT

IPC: G06F3/12 ,  B41J2/52 ,  G06K15/10 ,  H04N1/40 ,  H04N1/405 ,  H04N1/411

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.