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Difference between Low pass filter and High pass filter:

Low pass filter	High pass filter
It is used for smoothing the image.	It is used for sharpening the image.
It attenuates the high frequency.	It attenuates the low frequency.
Low frequency is preserved in it.	High frequency is preserved in it.
It allows the frequencies below cut off frequency to pass through it.	It allows the frequencies above cut off frequency to pass through it.
It consists of resistor that is followed by capacitor.	It consists of capacitor that is followed by a resistor.
It helps in removal of aliasing effect.	It helps in removal of noise.
G(u, v) = H(u, v) . F(u, v)	H(u, v) = 1 – H'(u, v)

Low Pass Filter:13 Facts You Should Know

By Soumali Bhattacharya

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  Definition of Low Pass Filter
  
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  Circuit Diagram
  
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  Active and Passive Low Pass filter
  
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  What does a LPF do? How does it work?
  
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  Operation
  
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  Frequency Response
  
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  Transfer Function of a LPF
  
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