Texture animation by means of Fourier interpolation [Animation de texture grâce à une interpolation de Fourier]
.FI(GAUSS,STAR,RANDOM(p))where p varies within [0.05,0.95] and RANDOM(p) is a random binary picture containing a proportion of p Nmin points and 1-p Nmax points respectively. For the definition of the pictures 'GAUSS' and 'STAR' see figure "Four tool pictures".