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。

youdao

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。

youdao