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Image processor, image forming apparatus, method of processing image

  • US 20060077466A1
  • Filed: 09/13/2005
  • Published: 04/13/2006
  • Est. Priority Date: 10/07/2004
  • Status: Active Grant
First Claim
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1. An image processor comprising:

  • a input data corrector that corrects image data of a target pixel by giving a weight to error values in the neighborhood of the target pixel and adding weighted error values to a tone value of the target pixel;

    an output tone value determining unit that determines an output tone data of the target pixel based on corrected image data, and a threshold corresponding to a position of the target pixel; and

    an error value calculator that calculates a difference between the output tone data and the corrected image data as an error value, wherein the output tone value determining unit sets the threshold in such a manner that a rate of change of a mean error value obtained from error values calculated by the error value calculator with respect to a change in the input tone value falls within a predetermined range.

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