function M1 = generate_constrained_map(M,nb_theta,obj,theta_max)

% generate_constrained_map - generate a constraint map from a 2D map.
%
%   M1 = generate_constrained_map(M,nb_theta,obj);
%
%   M is the 2D map (binary image, 0 for background, 1 for objects).
%   M1 is a 3D array, M1(:,:,k) is the 2D map for orientation
%       theta=(t-1)*2*pi/nb_theta.
%  obj is the size of the size of the rectangle object that moves
%   (eg. obj=[0.2,0.05]).
%
%   Copyright (c) 2004 Gabriel Peyr