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Filter Design

30 min.
At the end of this practical you should understand the concept of image filtering using high-pass and low-pass filters.


Low-pass filtering
High-pass filtering
Read the introductory sections in the MATLAB user guide regarding file I/O and displays. Familiarise yourself with the MATLAB "HELP" facility.

Run the matlab "demos" and select the "2D filtering and Filter Design" deomo from the "Image Processing" toolbox. Design several high-pass and low-pass filters and apply them to the images provided.
What characteristics do low-pass and high-pass filtered images display?
Why does high-pass filtering produce osscilatory artifacts at discontinuities?

(c) Imaging Science and Biomedical Engineering 2000 [paul.bromiley@man.ac.uk]

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