Lowpass Filtering

This program applies a brickwall lowpass filter to the image selected from the dropdown menu (see Chapter 3). The lower the cutoff spatial frequency, the more the image is blurred.
Click on the pushbuttons to compute the spectrum and filtered image.

Sliders: Unfiltered fraction of spectrum.
Displayed: Original and filtered image, its 2-D DFT magnitude, difference.

1. Original image
2. Fourier image (log of magnitude)

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3. Reconstructed image

4. Difference image