**Table 2:** Theoretical fractal dimension $D_{\rm th}$ , measured fractal dimension D for the studied objects and the relative error $\epsilon =(D_{\rm th}-D)/D_{\rm th}$ . Pixelization errors increase with increasing structure complexity.
	$D_{\rm th}$	D	$\epsilon$
fBm	1.8	1.516	$16 \%$
fBm	1.6	1.413	$12 \%$
vonKnoch	1.26	1.310	$-3 \%$

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