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4 December 2000 Multiresolution analysis with decimated wavelet transform for image zooming
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Blurred images are produced by interpolation process. A wavelet-based magnification method is proposed that both increases the resolution of an image and adds local high- frequency information, in order to provide digitally zoomed images with sharp edges. Wavelet transforms computed by the decimated Mallat's algorithm present pyramidal aspect. This pyramidal analysis combined with a prediction of high- frequency coefficients is used to produce a magnified image. The prediction is based on a zero-crossings representation and on the construction of a multiscale edge-signature database. Performances are evaluated for synthetic and noisy images. A significant improvement regarding some classical methods is observed.
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Frederic Nicolier and Frederic Truchetet "Multiresolution analysis with decimated wavelet transform for image zooming", Proc. SPIE 4119, Wavelet Applications in Signal and Image Processing VIII, (4 December 2000);

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