• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a reproduction technique and allows the moire to be eliminated from the link signal. A diaphragm is selected that corresponds in shape to at least one elementary cell of the original raster, with an area equal to the area of the raster cell of the original. The original is clamped onto the rotating drum, and the diaphragm is fed along the axis of the drum. Read the material by covering the elementary cells of the raster, the original without gaps and overlapping with the same relative orientation of the elementary and raster cells throughout the entire raster. At the same time align the aperture, vypolnennuyu in the form of several transparent areas, relative to the original raster. I zp f-ly, 12 ill. (About SU)
    公开号:SU1367870A3
    申请号:SU823444050
    申请日:1982-05-19
    公开日:1988-01-15
    发明作者:Юнг Эггерт；Вадле Хайнрих
    申请人:Др.-Инж.Рудольф Хелль Гмбх (Фирма)；
    IPC主号:
    专利说明:

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    The invention relates to a reproduction technique, the reading intended for pre-screened for subsequent reproduction of originals, in particular to a printing technique.
    The purpose of the invention is the elimination of moire.
    Fig. I shows a raster cell (RM) and an elementary cell (EZ) of the original raster; figure 2-4 samples of elementary cells; FIGS. 5-12 show the different phases of the reading process.
    The method consists in selecting a diaphragm for reading, suitable in shape and size, oriented relative to the original.
    The basis is a periodic raster for the original, in which any width of a cell and any angle of rotation of the raster is permissible. The plot of the optical density of individual raster points can be described by the function B (x, y). If we consider this function in connection with an equally dense surface, then it is periodic. It has a period A in the direction X and a period B in the direction Y (FIG. 1), and the coordinates X and Y can also be oblique. In order to remove the raster period from the slash signal, the slash interval defined by the diaphragm can be a rectangle — (with oblique coordinates, a parallelogram) with n × A and m × B sides, where the pits are natural numbers oriented parallel to the axis coordinate systems.
    To select a rectangle or parallelogram, it is necessary that the diagonals have a length n × 2A and gp × 2B and also be directed parallel to the axis (X, Y). If, in the first example, n is 1 and m 1, then a spot is obtained that allows reading without moire formation on any raster with optimal image sharpness. Diaphragms may also be used, the contours of which are not straight and the openings of which must not be interdependent surfaces.
     By orienting the diaphragm with respect to the axes, errors can even be tolerated when obtaining satisfactory results under most conditions of use.
    Figure 1 presents the raster of the original. It can be described using a two-dimensional grid of individual raster cells whose centers coincide with the centers of the raster points. Such a raster grid can be constructed from elementary cells, and the term elementary cell means the following.
    The area of an elementary cell corresponds to the area of one or several raster cells of the original raster Elementary cells can be dependent on one another or with independent surfaces, a set of which without gaps and overlays covers the raster grid of the original, and each individual elementary cell is oriented so that the position of the elementary The cells relative to the raster cell are the same across the entire raster grid of the original.
    Fig. 1 shows the raster grid of the original N with raster distances A, B and raster dots; the raster cell RM and the elementary cell EZ are allocated to the fat lines. As can be seen from this example, the element. the tarn - cell EZ is selected, such that it is covered by a raster cell RM,
    Figure 2 shows an elementary cell EZ-, which has the shape of a rectangle and covers two adjacent raster cells, and an elementary cell EZ 3 input square, rotated 45 ° relative to the raster axes, which, like EZ, consists of four half raster the cells.
    In FIG. 3, the elementary cell EZ4 dismantles the sample in a non-linear but dependent form. The combination of such cells also covers the entire raster grid.
    4 shows a sample of an elementary cell EZ 5 with an independent surface shape. Other elementary cells with independent surface shapes are also possible.
    Based on such elementary cells, the shape and size of the diaphragm for reading is determined.
    Figures 5-12 show the various successive phases of reading the original, and a simple square system of diaphragms and elementary cells was taken as the basis.
    In the example (starting with FIG. 5), the diaphragm BL moves in the direction of the arrow PF. relative to the original. In the separate phases of this movement, the ratio of black and white areas implies the same raster dot value, independent of the position of the diaphragm within the diaphragm region. The local raster frequency of the original is removed from the read signal. This occurs when the relative movement of the diaphragm and the original is made at any angle to the original raster (Fig, 6-12 dashed lines).
    In modern electronic reproduction machines, the relative displacement of the original and the matching bar is usually due to the fact that the original is clamped on the rotating drum, and the matching body is continuously or periodically fed along the axis of the drum. Therefore, the reading is carried out either in a spiral with a small slope, or with parallel lines of the perimeter (the latter also takes place when it is picked up from a flat base). If the original is, for example, a rectangular image rasterized at an angle of 30, the edges of which are clamped around the circumference of the drum, then the relative movement is read while reading (Figures 5-12).
    In the process of reading, it is necessary that the diaphragm be aligned with the raster of the original, respectively, of the elementary cell, from which it begins to move, and great accuracy is not required.
    When reading, the diaphragm, in contrast to the described elementary cell, may cover the original with overlap or at intervals. In the first case, a better resolution is achieved, which is important, for example, when the recording should be made using approximately as small a raster or even smaller, but with a different angle of rotation of the raster than the original. The preferred case (time saving) is when a recording is made with a coarser raster.
    Such a reading diaphragm can be made by a known method using stamping, etching.
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    electroerosion processing, perforation of metal discs with high energy rays or ri loiH i (application of partial i-rjip); cover I a npospaniTi iii ma. g-; i:.; :; i dusting in vacuum, TaKiiM eGr.- zgm, it is possible to obtain a light guide about a s. corresponding section.
    The present invention can also be applied in cases where the rasterized original is read: approximately line by line, where recording is made to the photosensitive medium by directly reflected light from the original through an appropriate optical display device (for example, a system of lenses and / or light guides) and through the diaphragm according to the invention.
    The preferred field of application is the printing technique, where a rasterized original is used to manufacture the printing plate. It happens that the original original is unavailable and only the already rasterized print or rasterized photo form is available.
    权利要求:
    Claims (2)
    [1]
    Invention Formula
    1, An optoelectronic reading method for reproducing rasterized originals by progressive scanning of an original with a diaphragm that is moved relative to the original, which differs in that, in order to eliminate the moire, the diaphragm corresponds in shape to at least one element of the original raster whose area is equal to an area smaller than least one raster cell of the original raster, while scanning is carried out by coating the element and the raster cells of the original without gaps and overlapping with the same tnositelnom unit position and scanning across a raster cell, a diaphragm with schitshanii oriented parallel to the orientation of elementary cell of the original raster.
    [2]
    2. The method according to claim 1, characterized by the fact that the diaphragm is made in the form of several transparent regions.
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    类似技术:
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    同族专利:
    公开号 | 公开日
    FI821777A0|1982-05-19|
    EP0065281A2|1982-11-24|
    BR8202982A|1983-05-03|
    AT58986T|1990-12-15|
    US4516175A|1985-05-07|
    EP0065281B1|1990-12-05|
    JPH0251172B2|1990-11-06|
    CA1193310A|1985-09-10|
    EP0065281A3|1986-03-19|
    YU104182A|1985-06-30|
    DE3280270D1|1991-01-17|
    JPS57201232A|1982-12-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3115545A|1962-09-18|1963-12-24|Radames K H Gebel|Grain spacing to light intensity translator for photographic enlargements|
    US3775559A|1970-11-12|1973-11-27|Xerox Corp|Aperture designs for facsimile scanning apparatus|
    JPS6246101B2|1979-01-20|1987-09-30|Canon Kk|
    US4336558A|1980-04-23|1982-06-22|American Hoechst Corp.|Imaging system and method with reduced moire interference|JPH0460390B2|1983-08-22|1992-09-25|Kyodo Printing Co Ltd|
    NL8501844A|1985-06-27|1987-01-16|Oce Nederland B V Patents And|METHOD FOR ENLARGING / REDUCING A DITHER IMAGE|
    NL8501846A|1985-06-27|1987-01-16|Oce Nederland B V Patents And|METHOD FOR RECONSTRUCTING A GRAY VALUE IMAGE FROM A DITHER IMAGE|
    JPH0777418B2|1986-03-17|1995-08-16|株式会社東芝|Image processing device|
    US4955824A|1987-04-14|1990-09-11|Pretchel David A|Two pin shunt|
    US4795602A|1986-03-19|1989-01-03|Pretchel David A|Two pin shunt and molding method|
    US4930020A|1986-12-29|1990-05-29|Martin James F|Facsimile transmission of photographic images|
    EP0276337B1|1987-01-24|1989-11-29|Dr.-Ing. Rudolf Hell GmbH|Aperture stop arrangement for the optoelectronic scanning of documents|
    US4926267A|1989-05-26|1990-05-15|Nynex Corporation|Reproduction of halftone original with reduced moire|
    IL98004A|1991-04-30|1997-02-18|Scitex Corp Ltd|Apparatus and method for descreening|
    US5515182A|1992-08-31|1996-05-07|Howtek, Inc.|Rotary scanner|
    US6320680B1|1998-06-18|2001-11-20|Digimarc Corporation|Stochastic scanning documents to change moire effects|
    US8014024B2|2005-03-02|2011-09-06|Xerox Corporation|Gray balance for a printing system of multiple marking engines|
    US8203768B2|2005-06-30|2012-06-19|Xerox Corporaiton|Method and system for processing scanned patches for use in imaging device calibration|
    US8259369B2|2005-06-30|2012-09-04|Xerox Corporation|Color characterization or calibration targets with noise-dependent patch size or number|
    US8711435B2|2005-11-04|2014-04-29|Xerox Corporation|Method for correcting integrating cavity effect for calibration and/or characterization targets|
    US7719716B2|2005-11-04|2010-05-18|Xerox Corporation|Scanner characterization for printer calibration|
    US7826090B2|2005-12-21|2010-11-02|Xerox Corporation|Method and apparatus for multiple printer calibration using compromise aim|
    US8102564B2|2005-12-22|2012-01-24|Xerox Corporation|Method and system for color correction using both spatial correction and printer calibration techniques|
    US8426749B2|2007-05-09|2013-04-23|Fujifilm Corporation|Electromagnetic shielding film and optical filter|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE3120030|1981-05-20|
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