04 Feb 2005
15 Mar 2005)
Uses graph cuts to segment foreground objects from a static background in video.
% GRAPHLABEL Label a graph based upon a graph cut.
% L = GRAPHLABEL(C, P) gives a labeling for
% a set of nodes, given the following inputs:
% C is a cost matrix where C(i,j) is the cost of assigning label i to node j.
% P is a square matrix giving the penalty for assigning two nodes different labels.
% I is an optional initial labeling.
% N is the number of cycles, and defaults to 1.
% If C is 2xN, an exact cut is returned using GCUT.
% If C has more than two rows, then an approximate labeling is returned.
function label = graphlabel(C,P)
cut = gcut([zeros(2),C;C',P],[1 2]);
label = cut(3:end); % We want just the pixel labels