How to find the fractal dimension of the image?why do we need it?

I need to find the features of the image in which i need to find the fractal dimension..i need to known how to find it and is i need to segment the image before i find fractal dimension.below is the code i have taken from web can i use this... below is the image to be processed </matlabcentral/answers/uploaded_files/10293/7c2m.jpg>

if true
  % FRACTDIM Compute the fractal dimension of an image
%
% D = fractdim(IMAGE)
%
% Calculates the fractal dimenstion (box-counting method) of a black and

% white edge image. function D=fractdim(IMAGE) [M,N]=size(IMAGE); i=mod(M,4); j=mod(N,4); IMAGE(M+4-i,:)=zeros(1,N); IMAGE(:,N+4-i)=zeros(M+4-i,1); [i,j]=size(IMAGE);

if M > N r=M; else r=N; end

D=log(sum(reshape(IMAGE,i*j,1)))/log(r); end