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�������պ����ѧѧ�� 2008, Vol. 34 Issue (03) :271-275    DOI:
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Approach based on speckle reduction using SPIHT for data compression of complex SAR image
Xiang Shiyong, Li Chunsheng, Chen Jie*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ���һ�ֶԺϳɿ׾��״�(SAR,Synthetic Aperture Radar)��ͼ��ѹ���ĸĽ��ķֲ������Ϸָ�(SPIHT,Set Partitioning in Hierarchical Trees)�㷨,��Ч���SAR��ͼ��ѹ��,����Ч�ر�����SAR��ͼ�����λ��Ϣ,�������˰ߵ�����.���ȸ���SAR��ͼ���ͳ����������Ԥ����,Ȼ�����С���任,�Բ�ͬ�Ӵ���С���任ϵ����ȡ��ͬ������,���������ްߵ���������,�پ���SPIHT��������,�õ�ѹ���������.����ʵ�����,��64����ѹ���ȵ������,ͨ�����ؽ�SAR��ͼ�����ݵ���λ����Ч������ƽ���������ϵ����ָ��IJ���,��֤�˸��㷨��Ȼ���кܺõ�����.
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Abstract�� A method based on speckle reduction using SPIHT(set partitioning in hierarchical trees) for data compression of complex SAR(synthetic aperture radar) image was presented, which could achieve both speckle reduction and image compression. According to the statistic characteristic of complex SAR image, complex SAR image was processed before wavelet transform. Soft-threshold speckle reduction and SPIHT image coding were applied to image compressing in wavelet domain. Wavelet coefficients in different subbands adopted different threshold in soft-threshold speckle reduction. The improved approach preserves the phase of the raw complex SAR image well and has a good effect of speckle reduction. It proves the efficiency of the improved approach for data compression of complex SAR image through evaluating phase error, ENL(equivalent number of looks) and complex spatial correlation efficient, comparing the intensity images of raw data and decompressed data, even at high compression ratio (64�� 1).
Keywords�� synthetic aperture radar   complex image   phase error   speckle reduction   wavelet transform     
Received 2007-06-29;
Fund:

������"�����������˲�֧�ּƻ�"����������Ŀ(NCET-06-0166)

About author: ������(1976-),��,�Ĵ�������,˶ʿ��,syxiang2005@163.com.
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������,���,�½�.����ȥ���SAR��ͼ��SPIHTѹ���㷨[J]  �������պ����ѧѧ��, 2008,V34(03): 271-275
Xiang Shiyong, Li Chunsheng, Chen Jie.Approach based on speckle reduction using SPIHT for data compression of complex SAR image[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(03): 271-275
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2008/V34/I03/271
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