发明授权
US08493627B2 Method for the digital screening of halftone images 有权
半色调图像数字化筛选方法

  • 专利标题: Method for the digital screening of halftone images
  • 专利标题(中): 半色调图像数字化筛选方法
  • 申请号: US12581526
    申请日: 2009-10-19
  • 公开(公告)号: US08493627B2
    公开(公告)日: 2013-07-23
  • 发明人: Ludo Kerz
  • 申请人: Ludo Kerz
  • 申请人地址: DE Heidelberg
  • 专利权人: Heidelberger Druckmaschinen AG
  • 当前专利权人: Heidelberger Druckmaschinen AG
  • 当前专利权人地址: DE Heidelberg
  • 代理商 Laurence A. Greenberg; Werner H. Stemer; Ralph E. Locher
  • 优先权: DE102008052126 20081020
  • 主分类号: H04N1/405
  • IPC分类号: H04N1/405 G06T5/00 H04N1/46
Method for the digital screening of halftone images
摘要:
A method for the digital screening of a halftone image by using a first screen having an arbitrary desired screen width and an arbitrary desired screen angle. For the method, the threshold value matrix of a second screen with a different screen angle and width is read out and compared with the color values of a halftone image presented. In order also to approximate screens having a particular irrational tangent and to avoid unpleasant sudden exposed device pixels in clear regions, it is proposed to provide at least one second threshold value matrix having X3Y3 addresses, the X3Y3 addresses of the second threshold value matrix are displaced by a factor 1/B in relation to the X2Y2 addresses of the first threshold value matrix, and to read out the second threshold value matrix as soon as an error D between the first and the second screen exceeds a predefined limiting value.
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