# Difference between Low pass filter and High pass filter

**Low pass filter:**

Low pass filter is the type of frequency domain filter that is used for smoothing the image. It attenuates the high frequency components and preserves the low frequency components.

**High pass filter:**

High pass filter is the type of frequency domain filter that is used for sharpening the image. It attenuates the low frequency components and preserves the high frequency components.

**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 frequency 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) |

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