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。
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.
频率选择表面（FSS）是具有选择频率功能的一块金属周期结构，它可以被设计成低通、高通、带通、带阻滤波器。
A frequency selective surface (FSS) is a metallic periodic structure with frequency selective properties. Depending upon design, it may be low-pass, high-pass, band-pass, band-stop filter.
该电路的一个重要特征是：它在单一积木块上能同时获得低通、带通和高通滤波功能。
The important feature of the proposed si circuit is that it can simultaneously obtain lowpass, bandpass and highpass filter outputs, in a single building block.
滤波器。右击指定高通、低通、带通或带阻滤波器。
Filter. Right-click for high-pass, low-pass, band-pass, or band-stop filter.
滤波器。可指定高通、低通、带通或带阻滤波器。
Filter. High-pass, low-pass, band-pass, or band-stop filter can be specified.
传统的全光微波滤波器大多是正系数，只能实现低通或等效带通。
All-optical filters with all positive coefficients can only function as low-pass filters or equivalent band-pass filters by traditional approach.
拖到绘图页上，然后右击可指定为高通、低通、带通或带阻滤波器。
Drag onto the page, then right-click to specify high-pass, low-pass, band-pass, or band-stop filter.
右击指定高通、低通、带通或带阻滤波器。
Right-click for high-pass, low-pass, band-pass, or band-stop filter.
右击指定高通、低通、带通或带阻滤波器。
Right-click for high-pass, low-pass, band-pass, or band-stop filter.
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