结果通过离散余弦变换，图像由空间域变到了DCT域，在DCT域用指数低通滤波器去噪，高通滤波器提取地面特征边缘信息。
The test data is processed with two kinds of filter. Results At compressing field noise restrain and edge extraction are realized.
结果通过离散余弦变换，图像由空间域变到了DCT域，在DCT域用指数低通滤波器去噪，高通滤波器提取地面特征边缘信息。
The test data is processed with two kinds of filter. Results At compressing field noise restrain and edge extraction are realized.
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