14_periodicx

14_periodicx - Periodic Noise Reduction by Frequency Domain...

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Unformatted text preview: Periodic Noise Reduction by Frequency Domain Filtering COMP344 COMP344 Periodic Noise Reduction by Frequency Domain Filtering Motivating Example COMP344 Periodic Noise Reduction by Frequency Domain Filtering Motivating Example... masked power spectrum noise reduced image COMP344 Periodic Noise Reduction by Frequency Domain Filtering Notch Filters Rejects (or passes) frequencies in predefined neighbourhood about a centre frequency ( u , v ) H np = 1- H nr must appear in symmetric pairs about the origin (except if the notch filter is located at the origin) shape of the notch areas can be arbitrary (e.g., rectangular) If u = v = 0 the Notch reject filter becomes a highpass filter the Notch pass filter becomes a lowpass filter COMP344 Periodic Noise Reduction by Frequency Domain Filtering Notch Filters... Ideal notch reject filter (centers at ( u , v ) and (- u ,- v )) H ( u , v ) = D 1 ( u , v ) ≤ D or D 2 ( u , v ) ≤ D 1 otherwise D 1 ( u , v ) = q ( u- M 2- u ) 2 + ( v- N 2- v ) 2 D...
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This note was uploaded on 09/24/2010 for the course COMP 344 taught by Professor Albertk.wong during the Fall '09 term at HKUST.

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14_periodicx - Periodic Noise Reduction by Frequency Domain...

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