The decomposition of the image continues by decomposing the low resolution output from each step, until the image is fully decomposed. Fig. 3 illustrates the effect of applying the non-standard wavelet transform to an image. Fig. 3a shows an image taken from the AT&T Database of faces [26]. Fig. 3b shows the effect of applying a one-level wavelet decomposition to this image (using the Haar wavelet). Fig. 3c shows the effect of completely decomposing the image. The wavelet filter used, number of levels of decomposition applied and quadrants chosen for feature extraction are dependent upon the particular application. For the experiments described in this paper, the non-standard DWT is used, which allows for the selection of