- Visual perception and human-computer interaction
- Computer graphics, eye tracking, virtual environments
- Computer vision and digital imaging
- Wavelet and multi-resolution analysis
\[
\phi_{j,k}(x) = 2^{j/2}\phi(2^{j}x - k),\ \ \
\psi_{j,k}(x) = 2^{j/2}\psi(2^{j}x - k),\ \ \ j,k \in {\bf Z}
\]