一種基于提升小波的SAR圖像有損壓縮算法
An Algorithm for SAR Imge Lossy Compression Based on Lifting Scheme
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摘要: 該文根據(jù)合成孔徑雷達(SAR)圖像局部相關(guān)性較弱,存在相干斑噪聲的特點,提出了一種基于提升小波的SAR圖像有損壓縮算法。它可有效去除相干斑噪聲,提高計算精度和速度,改進SAR圖像的壓縮性能。該算法采用了嵌入式零樹小波的編碼方法,很好地利用小波系數(shù)的特性,使得輸出的碼流具有嵌入特性。利用大量的實際SAR圖像對所提算法進行了仿真驗證,并與其它圖像壓縮算法進行了對比分析,表明所提算法是有效的。
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關(guān)鍵詞:
- SAR圖像壓縮; 相干斑去噪; 小波變換; 提升方案; 嵌入式零樹小波
Abstract: In this paper a new algorithm for SAR image lossy compression based on lifting scheme is brought forward, aiming at special characteristics of SAR imagery. The algorithm can reduce the speckle noise, improve the computation precision and time, and upswing the compression ability. The algorithm adopts embedded zerotree wavelets, making good use of the wavelet coefficients .Large numbers of SAR images validate the efficiency of the proposed algorithm.The results compare favorably with that of other image compression methods. -
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