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% gen_qbgn.m
% Generate and display a 3-D fruitcake-like volume.
%
% Nick Kingsbury, Cambridge University, Nov 2011.
function bg=gen_qbgn(N,F,seed)
if nargin<3
seed=0;
end
Q=4;
h = gaussian(3,0.01);
h = gaussian(1.5,0.01);
h = gaussian(8,0.01);
y = zeros(N,N,F);
RandStream.setGlobalStream(RandStream('mt19937ar', 'seed', seed));
for f=1:F,
x=randn(N,N);
y(:,:,f) = colfilter(colfilter(x,h).',h).';
end
for k=1:N,
y(k,:,:) = colfilter(squeeze(y(k,:,:)).',h).';
end
yvar = var(y(:));
y = y*(16/sqrt(yvar)) + 128;
t1=ceil(min(y(:)));
t2=floor(max(y(:)));
step=(t2-t1)/50;
z = double(softquant(y,[t1 t2 step]));
bg=z;
end
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