Lanczos resampling

The Lanczos filter is frequently used in computer graphics reconstruction filter. It was developed in 1979 by Claude E. Duchon meteorologists and is named after the Hungarian mathematician Cornelius Lanczos.

The Lanczos filter is defined as multiplied by a window function sinc function in order to ensure a gradual decrease towards the ends. The window function itself is a part of the sinc function. This leads to the following definition:

In which

The parameter a determines the size of the wearer and is typically 2 or 3

By the window function of the Lanczos filter resulting in less ringing than a truncated sinc filter.

Increases the same graphic with Lanczos filter