[英]What are high-frequency/low-frequency signals in an image?
I often encountered the term high-frequency/low-frequency signals in an image. 我经常在图像中遇到术语高频/低频信号。 And relevantly, high-pass filters for sharpening.
与此相关的是,用于锐化的高通滤波器。 I have a hard time relating the word frequency with 2d images.
我很难把单词频率与2d图像联系起来。 An image is simply a 2-d array of 3 values (r,g,b).
图像只是3个值(r,g,b)的2维数组。 What does frequency mean in this context?
在这种情况下,频率是什么意思? And how does a high-pass filter become sharpening the image?
高通滤波器如何使图像锐化?
It is related to fourier transform (AFAIK, t
in the formula is x,y
of pixel coordinate). 它与傅立叶变换 (AFAIK,公式中的
t
为像素坐标的x,y
)有关。
Roughly speaking :- 粗略地说 :-
high-frequency = high-signal when convoluted with high-frequency function
&& relatively low-signal when convoluted with low-frequency function
low-frequency = vice-versa
I am not so strong in this area. 我在这方面不是很坚强。
To avoid stealing their contents, here are all good links. 为避免窃取其内容,以下都是很好的链接。
They should contain information more than you need :- 他们应该包含比您需要更多的信息:
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