Mercurial > hg > smallbox
view util/sparco utils/thumbFromOp.m @ 247:ecce33192fcc tip
Added tag ver_2.1 for changeset cef4500b936f
author | luisf <luis.figueira@eecs.qmul.ac.uk> |
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date | Wed, 31 Oct 2012 12:24:44 +0000 |
parents | 62f20b91d870 |
children |
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function P = thumbFromOp(op,m,n,sm,sn,grayscale) % Output matrix P, of size m x n, sampled at % sm x sn upper top % Copyright 2008, Ewout van den Berg and Michael P. Friedlander % http://www.cs.ubc.ca/labs/scl/sparco % $Id: thumbFromOp.m 1040 2008-06-26 20:29:02Z ewout78 $ if nargin < 6, grayscale = 0; end info = op([],0); sm = min(info{1},sm); sn = min(info{2},sn); M = zeros(sm,sn); for i=1:sn v = zeros(info{2},1); v(i) = 1; w = real(op(v,1)); M(:,i) = w(1:sm); end mn = min(min(M)); mx = max(max(M)); M = (M - mn) / (mx-mn); idxm = floor(linspace(1,sm+1,m+1)); idxm = idxm(1:end-1); idxn = floor(linspace(1,sn+1,n+1)); idxn = idxn(1:end-1); if grayscale P = 1-M(idxm,idxn); else clrmap = hsv; M = 1 + round(M * (length(clrmap)-1)); P = zeros(m,n,3); for j1=1:m for j2=1:n P(j1,j2,:) = clrmap(M(idxm(j1),idxn(j2)),:); end end end