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�������պ����ѧѧ�� 2008, Vol. 34 Issue (05) :516-519    DOI:
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���ٻ�, ������, ��ҫ��*
�������պ����ѧ �Զ�����ѧ���������ѧԺ, ���� 100083
Method in image-s feature extraction and matching
Zhang Shaohui, Shen Xiaorong, Fan Yaozu*
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ���ͼ��������ȡ��ƥ�����Ӧ�Ժ�׼ȷ�Ե�����,���߶Ȳ��������任(SIFT, Scale Invariant Feature Transform)�㷨Ӧ�õ�ͼ��ƥ������.���ȴ�ԭ���϶�SIFT�㷨�����Խ����˷���,����visual studio 2005Ϊ����ƽ̨��SIFT�㷨�ֲ��������ʵ��;����Ի���ŷ�Ͼ���������׼����Ϊ���������ƶ�����SIFT�㷨��ȡ������Ӧ����ͼ������ƥ��,���Բ�ͬ�Ľ��ڱȽ��бȽ�,�����˽���ֵ.ͨ��3��ʵ��ͼ���ƥ��������,SIFT�㷨��ȡ��������ͼ�����š���ת�����ȱ仯��ƥ����ȷ�ʶ����ڻ�ӽ�100%,֤����SIFT�㷨��ȡ���������кܺõ���Ӧ�Ժ�׼ȷ��,���Խ�һ��Ӧ�õ�ͼ��ʶ���Լ�ͼ���ؽ�������.
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Abstract�� To solve the problem of adaptability and accuracy in the field of image feature extraction and feature matching, the method of scale invariant feature transform (SIFT) was introduced. Firstly the characteristics of the SIFT method were analyzed by theory, and the SIFT method was implemented step by step on the visual studio 2005 platform; Then the features extracted by SIFT method were applied to match images on the criterion of nearest neighbor based on Euclidean distance. A suggestion value bound was given by comparing the matching result of different nearest ratio. At last the effect of the SIFT method was validated by the matching result of three different groups of images. The matching result shows that the features extracted by SIFT method are invariant to image scale, rotation and illumination change, and the matching accuracies are all equal or close to 100%. These results prove that the features extracted by SIFT method have excellent adaptive and accurate characteristics, which are useful for the fields of image recognition, image reconstruction, etc.
Keywords�� feature extraction   feature matching   scale invariant feature transform   scale space     
Received 2007-05-08;


About author: ���ٻ�(1982-),��,ɽ���ൺ��,˶ʿ��,zhanahohui-3@163.com.
���ٻ�, ������, ��ҫ��.һ�ֻ���ͼ����������ȡ��ƥ��ķ���[J]  �������պ����ѧѧ��, 2008,V34(05): 516-519
Zhang Shaohui, Shen Xiaorong, Fan Yaozu.Method in image-s feature extraction and matching[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(05): 516-519
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