Fecha de publicación: 25/02/1993 Fuente: WIPO "pollen" A method for coding an image or other two-dimensional data array to provide a sequence of images having differing spatial frequency content is disclosed. The method generates the output images (933, 934, 935) by taking weighted sums of the pixels in the input image (908). The weights are sets of two-dimensional irreducible scaling and wavelet coefficients.