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Method for automatically separating out the defect image from a thermogram sequence

  • US 10,229,486 B2
  • Filed: 05/30/2017
  • Issued: 03/12/2019
  • Est. Priority Date: 09/06/2016
  • Status: Active Grant
First Claim
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1. A method for automatically separating out a defect image from a thermogram sequence, the method comprising the following steps:

  • (1). pre-processing the thermogram sequence by Independent Component Analysis (ICA), including the following substeps;

    obtaining a spatial and temporal heating response sequence (thermogram sequence) from a surface of a conductive material through an Eddy Current Pulsed Thermography (ECPT) testing system, and processing the thermogram sequence by conventional ICA, then, selecting an independent component with maximum kurtosis to reconstruct a defect image matrix according a size of an original thermogram, where the defect image matrix is an image to be separated, and;

    (2). separating out the defect image based on a first derivative statistical characteristics of the image to be separated, including the following substeps;

    (2.1). dividing a histogram of the image to be separated into n groups (n≥

    2), where a magnitude of each group is calculated as follows;

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