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MKFRACTALSRA

Section: User Commands (1)
Updated: 16 Mar 1998
Index

NAME

mkFractalSra - make fractal brownian motion noise

SYNTAX

mkFractalSra [-sw] <output image> <D> [<xsize> [<ysize>]]

DESCRIPTION

Generates fractional brownian motion noisewith fractal dimension D. The algorithm is knownas "Successive Random Addition"

   output image - name of generated image
   D            - fractal dimension between 2. and 3.
   xsize        - xsize of synthesized image
                  (default 512)
   ysize        - ysize of synthesized image
                  (default xsize)

Switches:
   -mean        - mean pixel value for corners
                  (default 128.0)
   -cstd        - standard deviation for corners
                  (default 5.0)
   -std         - init. st. dev. for other pixels
                  (default 25.0)

Note that meanfar from 128 combined with largestandard deviations will give a lot of over/under-flows,and a very poor result. cstdevshould be small to avoid"tilting" the whole image.

AUTHOR

Hĺvard Iversen, BLAB, Ifi, UiO

MODIFYED BY

Tor Lřnnestad, BLAB, Ifi, UiO

REFERENCE

.I Fournier, A., Fussel, D., and Carpenter, L.

"Computer rendering of stochastic models",Commun. ACM 25, 6 (June 1982), 372-382.

EXAMPLE

mkFractalSra -mean 100.0 fractal.img 2.5 200 400

ID

$Id: mkFractalSra.c,v 1.29 1997/03/07 12:51:50 svein Exp $

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