发明名称 |
Method and system for reference-free thermographic detection of subsurface defects using compressed image data |
摘要 |
A method and system for non-destructive, reference-free thermographic detection of sub-surface defects uses an infrared camera to capture images of a sample that has been heated and allow to cool to equilibrium temperature. The temperature-time data obtained for each pixel in each image is converted into the logarithmic domain and a least squares fit is conducted on the data to generate a polynomial expression corresponding to the temperature-time data for a given pixel. This polynomial expression can be transformed into the original time domain to obtain temperature-time data with improved signal-to-noise characteristics. Defects can be detected by observing the zero-crossing characteristic of the second derivative of the polynomial. |
申请公布号 |
AU1813201(A) |
申请公布日期 |
2001.06.12 |
申请号 |
AU20010018132 |
申请日期 |
2000.12.04 |
申请人 |
THERMAL WAVE IMAGING, INC.;STEVEN M. SHEPARD;BRUCE A. RUBADEAUX;JAMES R. LHOTA |
发明人 |
STEVEN M. SHEPARD;BRUCE A. RUBADEAUX;JAMES R. LHOTA |
分类号 |
H04N7/18;G01N25/72 |
主分类号 |
H04N7/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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