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�������պ����ѧѧ�� 2007, Vol. 33 Issue (06) :705-708    DOI:
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���1, ����ˬ1, Ҧ����2*
1. �������պ����ѧ �Զ�����ѧ���������ѧԺ, ���� 100083;
2. �й����ú����ܾ� ���հ�ȫ��������, ���� 100028
Analysis of coarseness of edges extracted from borescope images based on wavelet transform
Li Changyou1, Ma Qishuang1, Yao Hongyu2*
1. School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. Center of Aviation Safety Technology, General Administration of Civil Aviation of China, Beijing 100028, China

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Abstract�� To recognize whether there existed crack damages in the inner structure of aircraft engine based on the borescope images, a method (that was called coarseness factor) was presented to describe the coarseness of edge curves extracted from the borescope images. The method first decomposed an edge curve into the scale coefficients and wavelet coefficients using dynastic wavelet transform at all of the possible scales. For the coefficients of the wavelet transform, the logarithm entropy was presented to calculate the respective strength of the scale coefficients and wavelet coefficients. And the ratio of the logarithm entropies of the wavelet coefficients and ones of the scale coefficients was defined as coarseness factor. Using the coarseness factor to estimate the coarseness of a curve, the greater the coarseness factor is, the coarser the curve is. Experiments show that using the coarseness factor as recognition feature of borescope images, the crack damages of borescope images can be recognized successfully.
Keywords�� aircraft engine   image processing   wavelet transforms   pattern recognition     
Received 2006-11-01;


About author: ���(1964-),��,����������,��ʿ��,lcy8639@sohu.com.
���, ����ˬ, Ҧ����.����С���任�Ŀ�̽ͼ���Ե�ֲڶȷ���[J]  �������պ����ѧѧ��, 2007,V33(06): 705-708
Li Changyou, Ma Qishuang, Yao Hongyu.Analysis of coarseness of edges extracted from borescope images based on wavelet transform[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2007,V33(06): 705-708
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