bb_points.m

% Copyright 2011 Zdenek Kalal
%
% This file is part of TLD.
% 
% TLD is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
% 
% TLD 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 General Public License for more details.
% 
% You should have received a copy of the GNU General Public License
% along with TLD.  If not, see <http://www.gnu.org/licenses/>.


function pt = bb_points(bb,numM,numN,margin)
% Generates numM x numN points on BBox.

bb(1:2) = bb(1:2)+margin;
bb(3:4) = bb(3:4)-margin;

if (numM == 1 && numN ==1)
    pt = bb_center(bb);
    return;
end

if (numM == 1 && numN > 1)
    c = bb_center(bb);
    stepW = (bb(3)-bb(1)) / (numN - 1);
    pt = ntuples(bb(1):stepW:bb(3),c(2));
    return;
end

if (numM > 1 && numN == 1)
    c = bb_center(bb);
    stepH = (bb(4)-bb(2)) / (numM - 1);
    pt = ntuples(c(1),(bb(2):stepH:bb(4)));
    return;
end
    
stepW = (bb(3)-bb(1)) / (numN - 1);
stepH = (bb(4)-bb(2)) / (numM - 1);

pt = ntuples(bb(1):stepW:bb(3),(bb(2):stepH:bb(4)));

if size(pt,2) < numM*numN
    count = numM * numN - size(pt, 2);
    app = repmat(pt(:,end), 1, count);
    pt = [pt, app];
end