laboratory of image processing
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Laboratory ofImage Processing
Pier Luigi Mazzeopierluigi.mazzeo@cnr.it
July 24, 2014
The Fourier Transform with images
Display the obtained fft image
Download from my website the fftshow function, put it in your work directory
The fft examples
The fft examples
fftshow(cf, ‘log’)
Try with this circle (its edge appears burred). What does happen?
Filtering in the frequency domain (LP)
• Try to use different cut off (i.e. 5 and 30).• Try to use a circle with a gentle cutoff (i.e. b).
Filtering in the frequency domain (HP)
• Try to use different cut off (i.e. 5 and 30).• Try to use a circle with a gentle cutoff (i.e. b).
Gaussian filtering
Gaussian filtering HP(cont.)
Butterworth filtering
Butterworth filtering (cont.)
Butterworth filtering (cont.)
Butterworth filtering (cont.)
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