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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