However, the HF subband is created by subtracting the synthesized LF subband from original image but not by 2-D high-pass filtering original image.
但是，高频子带并不是通过2-D高通滤波原始图像，而是通过原始图像与合成的低通子带相减得到的。
So the author improves the 2-d sector filtering method, introduces the bang-transit and cake-cut filtering method in frequency - wave count area.
因此，作者将二维扇形滤波方法做了近一步的改善，引入了频率—波数域内带通切饼式滤波方法。
Median filtering can highlight wave band better than 2-d velocity filtering does. It also causes a better VSP wave field separation.
中值滤波较通常的二维视速度滤波更能有效地突出波组特征，分离VSP波场的效果也较二维滤波优越。
After the characteristics of 2-d frequency domain of SAR images are analyzed, a method named normalized standard deviation filtering is proposed.
通过分析SAR图像的频谱特点，提出一种归一化标准偏差滤波方法。
After the characteristics of 2-d frequency domain of SAR images are analyzed, a method named normalized standard deviation filtering is proposed.
通过分析SAR图像的频谱特点，提出一种归一化标准偏差滤波方法。
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