Image magnification using decimated orthogonal wavelet transform
Frédéric Nicolier, Frédéric Truchetet · 2000
Wavelet transforms computed by the decimated Mallat's ( see A Wavelet Tour on Signal Processing. Academic Press, 2nd ed., 1999) algorithm present a pyramidal aspect. This pyramidal analysis combined with a prediction of high-frequency coefficients is used to produce a magnified signal. The prediction is based on a zero-crossings representation and on the construction of a multiscale edge-signature database. Performances are evaluated for synthetic-noisy and natural images. A improvement regarding some classical methods is observed.