slowbeamtransab_m.m

来自「beamlet变化的工具箱」· M 代码 · 共 43 行

%  SlowBeamTransAB_m -- Slow Beamlet Transform, taking average at boundary
%   Usage
%     [E,L] = SlowBeamTransAB_m(img);
%   Input
%     img     square image, n by n
%   Outputs
%     E       beamlet coefficients
%     L       lengths of beamlets
%   Description
%     We create a structure which is very similar to the wedgelet coefficients.
%     The difference is that we also provide length for beamlets. 
% 
%     [1] Scale s means that image is divided into 2^s by 2^s subsquares. 
%     Each subsquare is n/2^s by n/2^s. 
% 
%     [2] Thinking of the m by m subsquare as a m by m grid, there are 4*m
%     lattice points on the boundary of this subsquare. Label them from 1 to 
%     4*m, starting from the upper left corner and going anticlockwise on the
%     boundary. 
% 
%     [3] Beamlet coefficient is basically an line integration. Suppose the 
%     image is a function which is piecewise constant in one cell -- a 1 by 1
%     subsquare. If the beamlet goes along a interior boundary (which is inside
%     the image, but is a boundary of a cell), then it is the average of the 
%     function values in the contacting two cells. 
% 
%     [4] Implementation should be almost parallel to the SlowWedgeTrans.m
%  
%
%
% Part of BeamLab Version:200
% Built:Friday,23-Aug-2002 00:00:00
% This is Copyrighted Material
% For Copying permissions see COPYING.m
% Comments? e-mail [e-mail]
%
%
% Part of BeamLab Version:200
% Built:Saturday,14-Sep-2002 00:00:00
% This is Copyrighted Material
% For Copying permissions see COPYING.m
% Comments? e-mail [e-mail]
%