Volume 34 Issue 03
Mar.  2008
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Xiang Shiyong, Li Chunsheng, Chen Jieet al. Approach based on speckle reduction using SPIHT for data compression of complex SAR image[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(03): 271-275. (in Chinese)
Citation: Xiang Shiyong, Li Chunsheng, Chen Jieet al. Approach based on speckle reduction using SPIHT for data compression of complex SAR image[J]. Journal of Beijing University of Aeronautics and Astronautics, 2008, 34(03): 271-275. (in Chinese)

Approach based on speckle reduction using SPIHT for data compression of complex SAR image

  • Received Date: 29 Jun 2007
  • Publish Date: 31 Mar 2008
  • 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).

     

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