公开(公告)号：EP0325373A2

公开(公告)日：1989-07-26

申请号：EP89300276.6

申请日：1989-01-12

申请人： AT&T Corp.

发明人： Chamzas, Christodoulos ,  Duttweiler, Donald Lars

IPC分类号： H04N1/415 ,  H04N1/411

CPC分类号： H04N1/411

摘要： A high resolution image is decomposed to a basic lower resolution replica and a plurality of supplemental information fields for use in a progressive high resolution image facsimile transmission system. The basic lower resolution replica is generated by successive decompositions of the original image into a plurality of intermediate lower resolution replicas and corresponding supplemental information fields by employing a so-called edge decomposition technique. The supplemental information fields are required in a receiver to upgrade the basic lower resolution replica toward the original high resolution replica.

摘要翻译： 高分辨率图像被分解为基本的较低分辨率的复本以及用于逐行高分辨率图像传真传输系统的多个补充信息字段。 通过采用所谓的边缘分解技术，通过将原始图像连续分解成多个中间较低分辨率副本和对应的补充信息字段来生成基本的较低分辨率副本。 在接收机中需要补充信息字段来将基本的较低分辨率副本升级到原始的高分辨率副本。

公开(公告)号：EP0283715A2

公开(公告)日：1988-09-28

申请号：EP88102345.1

申请日：1988-02-18

申请人： ANT Nachrichtentechnik GmbH

发明人： Lohscheller, Herbert, Dr. Ing. ,  Franke, Uwe, Dipl.-Ing.

IPC分类号： H04N1/415 ,  H04N1/41

CPC分类号： G06T9/007 ,  H04N1/642 ,  H04N11/044 ,  H04N19/154 ,  H04N19/60

摘要： Zur Codierung von Bildsignalen, insbesondere für die Farb­einzelbildübertragung, werden Spektralkoeffizienten mittels einer DCT gebildet. Eine Wahrnehmbarkeits-Schwellwertent­scheidung angewendet auf Blöcke dieser Spektralkoeffizienten wird in ihrer Empfindlichkeit in Abhängigkeit des Auftretens von Kantenstrukturen im Bildinhalt gesteuert. Eine Quanti­sierung und eine Entropiecodierung schließt sich an die Schwellwertentscheidung an. Zur Datenreduktion werden den Spektralkoeffizienten blockweise Klassen zugeordnet. Zur Identifizierung der Spektralkoeffizienten zu solchen Klassen genügt die Übertragung einer Klasseninformation.

摘要翻译： 为了编码图像信号，特别是对于各个图像的颜色传输，通过DCT形成频谱系数。 根据图像内容中的边缘结构的出现来控制应用于这些频谱系数的块的感知阈值判定装置的灵敏度。 阈值决定之后是量化和熵编码。 为了减少数据，将类别逐块分配给频谱系数。 类信息的传输足以识别这些类的频谱系数。

公开(公告)号：EP0196046A3

公开(公告)日：1986-12-30

申请号：EP86104006

申请日：1986-03-24

申请人： FINGERMATRIX, INC.

发明人： SCHILLER, MICHAEL

IPC分类号： H04N1/415 ,  G06T3/40 ,  H03M7/30 ,  H04N1/40 ,  G06F15/66

CPC分类号： G06T3/40 ,  H04N1/40068

摘要： An optical and electronic scan produces an image com­ posed of binary value pixels. An automatic picture compres­ sion routine reduces the number of pixels in the image. A first stage four to one reduction in the number of pixels is achieved by treating each mutually exclusive four pixel unit as a separate set. A binary value is assigned to each four pi­ xel set. That binary value is assigned to a single pixel in a first output image. The same process is repeated a second time to provide a final output image that has one-sixteenth the number of pixels as has the original input image.
The value assigned to each four pixel unit set is a weighted function of the binary value of each of the sixteen pixels in a four pixel by four pixel subfield in which the unit set is centered. The greatest weight is give to the center pi­ xels, that is, to the four pixels of the unit set. Lesser weight is given to the peripheral pixels. Among the peripheral pi­ xels, lesser weight is given to the four corner pixels than is given to the eight side pixels between the corners.
In the weighting process, the significance of the binary value of the sixteen pixels in the subfield is in part a function of the total pattern of the pixel values in the subfield.

公开(公告)号：EP0199065A2

公开(公告)日：1986-10-29

申请号：EP86103439.5

申请日：1986-03-14

申请人： International Business Machines Corporation

发明人： Toyokawa, Kazuharu

IPC分类号： H04N1/415 ,  H04N1/419 ,  H04N1/41

CPC分类号： H04N19/93

摘要： @ A coding process for a facsimile transmission system employs block coding and dither matrices of black and white picture elements, wherein each matrix represents a portion of a subject (22). The subject is scanned to provide gray-scale tone-level data, and the data of continuous tone regions of the subject is represented by standardized patterns in matrix form. A run of identical patterns is counted in the scanning direction and a symbol incidating the number of such repetitions is placed in the code in lieu of the succession of code words representing individual ones of the repeating patterns. A second symbol is inserted into the code to indicate a succession of runs of repeating patterns in the same column now positioned in two or more rows. The second symbol is utilized in lieu of a repetition of code words corresponding to each of the repeated patterns. The two symbols provide for two dimensional compression of the length of the message for improved efficiency of transmission of pictorial data between the subject and a display of an image of the subject.

公开(公告)号：EP0149050A2

公开(公告)日：1985-07-24

申请号：EP84113739.1

申请日：1984-11-14

申请人： International Business Machines Corporation

发明人： Asano, Hideo

IPC分类号： H04N1/415

CPC分类号： H04N1/4135 ,  H04N1/415

摘要： Facsimile transmission system in which the PEL data from the scanner unit (1) is sampled by a sample window (21) which equals the PEL size defined in an AM-PM-VSB transmission system. The positions of white or black PELs enclosed by the sample window is detected. The sample window includes four scanned small size PELs, and sixteen four-bit patterns representing the positions of the white or black PELs in the window are assigned to sixteen amplitude levels for amplitude modulation, respectively. These values are stored in a conversion table (7). For each sampled bit group, its bit pattern is determined, and the related data for controlling the amplitude of the carrier signal are fetched from the conversion table.

摘要翻译： 传真传输系统，其中来自扫描仪单元（1）的PEL数据由等于在AM-PM-VSB传输系统中定义的PEL大小的样本窗口（21）采样。 检测由样品窗口包围的白色或黑色PEL的位置。 样本窗口包括四个扫描的小尺寸PEL，并且分别在窗口中表示白色或黑色PEL的位置的十六个四位图案分别用于幅度调制的十六个幅度电平。 这些值存储在转换表（7）中。 对于每个采样比特组，确定其比特模式，并且从转换表中提取用于控制载波信号幅度的相关数据。