Scaling, wavelets, image compression, and

encoding

NASA’s extensive image compression requirements may be met in part by the use

of wavelet techniques.1 Wavelets form a large class of signal and image transforms,

generally characterized by decomposition into a set of self-similar signals that vary

in scale and (in 2D) orientation.2 The Discrete Wavelet Transform (DWT) is a

particular member of this family which operates on discrete sequences, and which

has proven to be an effective tool in image compression