The aerial image with noise is introduced. Aiming at the characteristics of aerial image has both white Gauss noise and pulse noise, a denoising method based on four-order PDE and improved adaptive median filter is proposed for data processing. An improved median filter was used to remove the pulse noise, and the anisotropy and the boundary retention characteristics with four-order PDE were used for filtering image. The experiment indicates that this method can filter noise and hold boundary, avoid staircase effect, and has strong robustness.%对航拍图像所含噪声进行了分析,针对航拍图像主要含有高斯白噪声和脉冲噪声的特点,根据后续数据处理需要,提出一种基于四阶偏微分方程(PDE)去噪模型与改进的自适应中值滤波相结合的混合去噪方法.首先使用改进的中值滤波去除脉冲噪声,然后利用四阶偏微分方程的各向异性及边界滞留特性进行图像滤波.实验表明,该方法在去除噪声和保持边界的同时,还能避免产生阶梯效应,比单独采用其中一种方法的去噪效果更为显著,鲁棒性更强.
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