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findmarker.m
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findmarker.m
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% Copyright (C) 1993-2011, by Peter I. Corke
%
% This file is part of The Machine Vision Toolbox for Matlab (MVTB).
%
% MVTB is free software: you can redistribute it and/or modify
% it under the terms of the GNU Lesser General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
%
% MVTB is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU Lesser General Public License for more details.
%
% You should have received a copy of the GNU Leser General Public License
% along with MVTB. If not, see <http://www.gnu.org/licenses/>.
i=iroi(im);
% attempt to find the markers using simple vision methods
i2=imorph(i,ones(3,3),'max'); % eliminate the markers
iff=flatfield(i2); % and compute the flat field
idisp(iff-i)
pause
[k,s]=kmeans(iff-i,3); % now k-means segmentation
idisp(s)
pause
[l,nblobs]=ilabel(s==3); % and assume brightest points are markers
idisp(l)
colormap(hot(nblobs));
pause
f=iblobs(l) % now extract binary image features
hold on
for i=1:12
if f(i).area < 100,
plot(f(i).xc,f(i).yc,'*w')
end
end
% now enter the refinement phase