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�������պ����ѧѧ�� 2005, Vol. 31 Issue (11) :1204-1207    DOI:
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������1, ����1, ����ƽ2, ��ӱ�1*
1. �������պ����ѧ ��е���̼��Զ���ѧԺ, ���� 100083;
2. �������ղ����о�Ժ, ���� 100095
Image processing algorithms for uneven heating in infrared thermographic NDT
Guo Xingwang1, Shao Wei1, Guo Guangping2, Liu Yingtao1*
1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. Beijing Istitute of Aeronautical Materials, Beijing 100095, China

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Abstract�� In infrared thermographic non-destructive testing, to reduce the effects of non-uniform heating and increase defect contrast and inspection depths, the thermal image sequence processing algorithms were studied based on the pulsed thermography of carbon fibre reinforced plastic samples. The factors that produce uneven heating were analyzed and summarized. Three types of data processing algorithms, including deleting fitted background, polynomial fitting and integrated technique, were proposed based on the least square method. The algorithms were verified and compared by experiments and their processing effects were quantitatively evaluated by three statistical standards of image evaluation. The result shows that the deleting fitted background technique can effectively remove the bad influence of uneven heating on the defect inspection, the polynomial fitting method can decrease uneven heating effect and increase defect contrast at the same time, and the integrated approach has the advantages of the two forenamed methods and can more greatly enhance defect contrast.
Keywords�� infrared imaging   image processing   nondestructive examination   composite materials     
Received 2004-09-03;
Fund:

������Ȼ��ѧ����������Ŀ(50175003); ���տ�ѧ����������Ŀ(02G51050); ���Ҹ߼����о���չ�ƻ�������Ŀ(2003AA333090)

About author: ������(1964-),��,���ɹź�����,������, xingwangguo@buaa.edu.cn.
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������, ����, ����ƽ, ��ӱ�.������������Ȳ���ʱ��ͼ������[J]  �������պ����ѧѧ��, 2005,V31(11): 1204-1207
Guo Xingwang, Shao Wei, Guo Guangping, Liu Yingtao.Image processing algorithms for uneven heating in infrared thermographic NDT[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2005,V31(11): 1204-1207
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