Image zooming by wavelets

Enlargement and reduction of images are often required in image processing. Popular methods for re-sizing are standard interpolation methods. Recently , wavelets and fractal-based methods are developed for re-sizing. In this p aper, wavelet zooming algorithm based on pyramid algorithm for wavelet tran sformation is explained. Also performance analysis of wavelet-based zooming method is investigated. We find that wavelet zooming with enhanced coeffic ients gives better visual quality. The objective error analysis also agrees with this. Wavelet zooming has also been performed block-wise. A significa nt drawback of the method is that the scaling factor should be power of 2.