【摘要】 讨论了合成孔径声纳的干涉相位图降噪问题。利用加性噪声模型,分析了四种降噪算法:像素平均法、非线性条件邻域均值法、模糊中值法和向量滤波法。通过仿真数据生成的干涉相位图进行降噪分析得到结论:通过像素平均法和条件邻域均值法降噪后不能准确地生成高度图,不推荐在实际中使用。而模糊中值法和向量滤波法通过降噪可以准确地生成高度图。通过相位图残留点数和高度图方差对比发现,向量滤波法性能最优,是一种快速有效的噪声抑制方法。更多还原

【Abstract】 Noise reduction for interferometric phase images in synthetic aperture sonar(SAS) is addressed in this paper.The phase noise is modeled as additive noise.Four filtering algo-rithm are analyzed.They are pixel-averaging,conditional neighborhood-averaging,morphological and mo-dified median filtering,and vector-filtering.Using the interferometric phase images gener-ated with simulated data,it is found that only the morphological and modified median filtering algorithm and the vector-filtering algorithm can produce accurate height maps.By comparison of residues and the height map variance,it is concluded that the vector-filtering algorithm has the best performance.更多还原