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Method of camouflaging defective print elements in a printer

  • US 7,639,402 B2
  • Filed: 11/04/2004
  • Issued: 12/29/2009
  • Est. Priority Date: 11/05/2003
  • Status: Active Grant
First Claim
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1. A method of camouflaging defective print elements in a printer having a printhead with a plurality of print elements and capable of printing a binary pixel image, wherein each pixel of the image is assigned to a print element with which it is to be printed, and image information of a pixel that is assigned to a defective print element is shifted to nearby pixel positions where it can be printed with a non-defective print element, the method comprising the steps of:

  • a) representing the image information to be printed by a multi-level pixel matrix wherein a grey level of each pixel is indicated by a number;

    b) transferring the grey levels of pixels that are assigned to a defective print element, to neighbouring pixels in the pixel matrix; and

    c) converting the pixel matrix having the transferred grey levels, into a bitmap to be printed.

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