low pass filter VS high pass filter

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ram
ram 2011-5-24
评论： Müberra Kancan 2018-11-10
hello every one
Iwant to ask which result is better?low pass filter OR high pass filter?
thx in advance

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回答（3 个）

Jan
Jan 2011-5-24
A cute question. The low-pass filter let the low frequencies pass, while the high frequencies are blocked, and vice-versa for the high-pass filter. If you want to suppress the low frequencies, the high-pass filter is "better". To be correct, the low-pass filter would destroy the searched signal in this case - therefore it is not "worse", but wrong for your task.
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Müberra Kancan
Müberra Kancan 2018-11-10
HOW DO YOU SEE THE CUT OFF FREQUENCY TO USE A HIGH PASS FILTER, WE DON'T KNOW WHERE WE HAVE TO CUT IT

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Walter Roberson
Walter Roberson 2011-5-24
Different kinds of filters are used for different purposes. There are situations where one is appropriate and not the other.
ram
ram 2011-5-24
thx 4 replay:)
when a low pass filter is better than high pass filter?
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ram
ram 2011-5-24
yes I have read it
he wrote about when the high pass better than low pass:)
but I ask about the situation on which LOW better than HIGH?
I think when image is very noisy the low is better than high
is that correct?

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