A wavelet transform decomposes a function or time series into a sum of products of wavelets from a collection. The collection is often defined mathematically using a kernal, which then mans thet thay have good properties. It is rather like a Fourier transform, as the wavelets typically opertae at different tmeoral or spatial scals, but whereas the sine/cos funcitons used in the Fourier transform extend over the etire temproal or spatial domain, wavelets are local.
Defined on page 318
Used on pages 153, 272, 318
Also known as wavelet transformation
Mexican hat' wavelet
A simple family of wavelets -- the Haar Wavelet