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

  • Patent Title: Method for the digital screening of halftone images
  • Patent Title (中): 半色调图像数字化筛选方法
  • Application No.: US12581526
    Application Date: 2009-10-19
  • Publication No.: US08493627B2
    Publication Date: 2013-07-23
  • Inventor: Ludo Kerz
  • Applicant: Ludo Kerz
  • Applicant Address: DE Heidelberg
  • Assignee: Heidelberger Druckmaschinen AG
  • Current Assignee: Heidelberger Druckmaschinen AG
  • Current Assignee Address: DE Heidelberg
  • Agent Laurence A. Greenberg; Werner H. Stemer; Ralph E. Locher
  • Priority: DE102008052126 20081020
  • Main IPC: H04N1/405
  • IPC: H04N1/405 G06T5/00 H04N1/46
Method for the digital screening of halftone images
Abstract:
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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