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filtering3.slides.printing.2

# filtering3.slides.printing.2 - High-Pass and Band-Pass...

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High-Pass and Band-Pass Filtering High-Pass and Band-Pass Filtering CS 450: Introduction to Digital Signal and Image Processing Bryan Morse BYU Computer Science High-Pass and Band-Pass Filtering Introduction Sharpening Blurring is low-pass filtering, so deblurring is high-pass filtering. Explicit high-pass filtering Unsharp Masking Deconvolution Edge Detection Tradeoff: Reduces blur, but Increases noise

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High-Pass and Band-Pass Filtering Introduction High-Pass Filtering Ideal: H ( u ) = 1 if u > u c 0 otherwise Gaussian: H ( u ) = 1 - e - 1 2 u 2 / u c 2 Butterworth: H ( u ) = 1 1 + ( u c 2 / u 2 ) n High-Pass and Band-Pass Filtering Introduction High-Pass Filters Ideal Butterworth Gaussian
High-Pass and Band-Pass Filtering Ideal Filters Ideal Filters and Ringing High-Pass and Band-Pass Filtering Ideal Filters Ideal Filters and Ringing (cont’d)

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High-Pass and Band-Pass Filtering Ideal Filters Ideal Filters and Ringing High-Pass and Band-Pass Filtering Gaussian Filters Gaussian High-Pass Filters H ( u ) = 1 - e - 1 2 u 2 / u c 2 20 40 60 80 100 120 0.2 0.4 0.6
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filtering3.slides.printing.2 - High-Pass and Band-Pass...

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