Removing high frequency noise pulses by a low-pass filter and Schmitt-trigger.

用一低通滤波器和施密特触发器排除高频噪声脉冲。

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The traditional low-pass filter method can restrain the high frequency part and decrease noise but may destroy image detail, and other methods also have other defects.

传统的低通滤波方法将图像的高频部分滤除，虽然能达到降低噪声的效果，但会破坏图像的细节。

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As a final step, we can use a high pass filter to sharpen the image and ensure if we are going to reduce the size to use it for the web we are not going to lose any information and definition.

作为最后一步，我要采用高通波滤镜来锐化这个照片，以便我们以后降低这个图片的尺寸时不失去图片里的细节。

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In fact, there's little of note in this utilitarian area, though those low-to-high pass filter controls are definitely a welcome addition.

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