int im_gaussnoise(image, xsize, ysize, mean, sigma)
int xsize, ysize;
double mean, sigma;
DESCRIPTIONim_gaussnoise() creates a float one band gaussian noise picture of size xsize by ysize. The created image has mean mean and square root of variance equal to sigma. The noise is generated by averaging 12 random numbers.
RETURN VALUEThe function returns 0 on success and -1 on error.
AUTHORN. Dessipris - 10/05/1991