Teaching

Interactive demos and course materials. These are works in progress, and are not linked from the rest of the site.

Interactive demos

Signals & images

• 2D Fourier basis wave explorer — how a spatial frequency vector (u, v) maps to a striped cosine pattern, and where it lands in the frequency plane.
• Frequency-domain image editor — forward FFT, edit the spectrum with filters or a brush, inverse FFT. Shows what low-pass, high-pass, and band-pass actually do to an image.