Sampling and Reconstruction Digital Image Processing How does it - PowerPoint PPT Presentation

Apr 22, 2023 •258 likes •350 views

Sampling and Reconstruction Digital Image Processing How does it help? Filtering reduces frequency content. Hence, lower sampling is sufficient. Input (256 x 256) Filtered (256 x 256) ANTI-ALIASING Insufficient sampling. Hence, aliasing.

Sampling and Reconstruction Digital Image Processing
How does it help? Filtering reduces frequency content. Hence, lower sampling is sufficient. Input (256 x 256) Filtered (256 x 256) ANTI-ALIASING Insufficient sampling. Hence, aliasing. Subsampled from filtered Subsampled(128 x 128) image(128 x 128) Slide 2 ICS 280: Visual Perception
Sampling – Frequency Domain Convolution f f s -f -f s s s 2 2 - f - f s f f s 2 f 2 f s 3 f s 3 f s s s s - f - f s f f s 2 f 2 f s 3 f 3 f s s s s s Slide 3 ICS 280: Visual Perception
Reconstruction – Frequency Domain - f - f s f f s 2 f s 2 f 3 f s 3 f s s s s -f s -f f s f s s Multiplication 2 2 -f -f s f f s s s Slide 4 ICS 280: Visual Perception 2 2
Reconstruction (Wider Kernel) - f s - f f f s 2 f s 2 f 3 f s 3 f s s s s -f s -f f s f s s PIXELIZATION: Lower 2 2 frequency aliased as high frequency -f -f s f s f s s Slide 5 ICS 280: Visual Perception 2 2
Reconstruction (Narrower Kernel) - f s - f f s f 2 f s 2 f 3 f s 3 f s s s s -f -f s f s f s s BLURRING: Removal of 2 2 high frequencies -f -f s f f s s s Slide 6 ICS 280: Visual Perception 2 2
Aliasing artifacts (Right Width) Slide 7 ICS 280: Visual Perception
Wider Spots (Lost high frequencies) Slide 8 ICS 280: Visual Perception
Narrow Width (Jaggies, insufficient sampling) Slide 9 ICS 280: Visual Perception

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