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Process and device for the binarization of a pattern

  • US 4,509,195 A
  • Filed: 12/28/1981
  • Issued: 04/02/1985
  • Est. Priority Date: 01/05/1981
  • Status: Expired due to Term
First Claim
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1. A process for binarization of a signal indicative of intensity values of spatially distributed discrete points of a pattern wherein each of successively scanned elementary areas is evaluated as being of dark or bright quality depending on the intensity values of a number of points around said elementary area, wherein said process comprises, for each said elementary area:

  • registering the intensity values of points distributed in at least two concentric rings within at least one sector centered on said elementary area,determining a number of contrast values each equal to the difference of registered intensity values between a point of an inner ring and a point of an outer ring,assigning a positive and negative difference sign to respectively the positive and negative contrast values showing an absolute value higher than a predetermined contrast threshold, counting separately said positive and negative difference signs,and assigning a light or dark quality to said area respectively when said counted signs contain a predominant number of positive or negative signs conforming to a predetermined minimum condition.

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