Fig. 3.

Experimental results on a simulated phantom. a) The original and the subsampled data in the image, wavelet and Fourier domains. b) Upsampling of the input images by zero-padding. Note how aliasing artifacts are produced when zero-padding is performed in the Fourier, as opposed to the wavelet domain. c) Simple mean of the upsampled images. Note the artificial blurring resulting from the combination by simple averaging. d) Selective fusion using the proposed wavelet method and the Fourier method.