low pass filter VS high pass filter

hello every one

Iwant to ask which result is better?low pass filter OR high pass filter?

thx in advance

Answer 1

[Jan]

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.

[Müberra Kancan]

HOW DO YOU SEE THE CUT OFF FREQUENCY TO USE A HIGH PASS FILTER, WE DON'T KNOW WHERE WE HAVE TO CUT IT

Answer 2

[Walter Roberson]

Different kinds of filters are used for different purposes. There are situations where one is appropriate and not the other.

Answer 3

[ram]

thx 4 replay:)

when a low pass filter is better than high pass filter?

[Sean de Wolski]

Read Jan's post.

[ram]

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?

[Sean de Wolski]

Sigh.