filtering.slides.printing

filtering.slides.printing - Filtering Filtering CS 450:...

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Filtering Filtering CS 450: Introduction to Digital Signal and Image Processing Bryan Morse BYU Computer Science
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Filtering Introduction Filtering Filtering : Altering a signal by multiplying each (complex) component F ( u ) in the frequency domain by a (complex) multiplier H ( u ) . Example: An equalizer for a stereo or other music system— you shape what happens to each frequency.
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Filtering Introduction Filtering Remember, H ( u ) is complex: I Magnitude - multiplies the amplitude of each frequency by a certain amount I Phase - shifts that frequency by some time or spatial offset I Modulation filtering changes the magnitude (most common) I Phase filtering changes the phase (less common)
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Filtering Introduction Common Forms of Filtering Described by what they do to the magnitude: Low-pass Keeping mainly low frequencies High-pass Keeping mainly high frequencies High-boost Boosting mainly high frequencies Band-pass Keeping mainly midrange frequencies Band-suppress Suppressing mainly midrange frequencies 20 40 60 80 100 120 0.2 0.4 0.6 0.8 1 0.8 1
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This note was uploaded on 03/02/2012 for the course C S 450 taught by Professor Morse,b during the Winter '08 term at BYU.

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filtering.slides.printing - Filtering Filtering CS 450:...

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