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Lumber defect scanning including multi-dimensional pattern recognition

  • US 5,703,960 A
  • Filed: 09/16/1996
  • Issued: 12/30/1997
  • Est. Priority Date: 08/24/1994
  • Status: Expired due to Term
First Claim
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1. A method for identifying a defect relative to a given wood article, said method comprising the steps:

  • collecting a first set of sensor data values taken from sensors directed toward a portion of a sample wood article surface, said portion of said sample wood article surface corresponding to a known defect, said set of sensor data values including a first specular reflection value and a first diffuse reflection value each representing wood grain structure at said portion of said wood article;

    selecting at least one mathematic function applied to said set of sensor data values and providing a given distance therebetween;

    collecting a second set of sensor data values taken from sensors directed toward a portion of said given wood article, said second set of sensor data values corresponding to said first set of sensor data values and including a second specular reflection value and a second diffuse reflection value;

    applying said mathematic function to said second set of sensor data values; and

    if said at least one mathematic function indicates distance between said second set of sensor data values at or below said given distance then identifying said portion of said given wood article as corresponding to said known defect.

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