EXPAND2D_BASE - Base function for EXPAND2D.

Contents

Syntax

  Ie = EXPAND2D_BASE(I, filter, order);

See also

Ressembles: EXPAND2D, PYRUP, REDUCE2D_BASE. Requires: EXPAND2D_MEX.

Function implementation

function Ie = expand2d_base(I, filter, order)

dealing with multispectral images

[X,Y,C] = size(I);

if C>1
    Ie = zeros(X*2,Y*2,C);
    for c=1:C
        Ie(:,:,c) = expand2d_base(I(:,:,c), filter, order);
    end
    return;
end

main program

if strcmpi(filter,'lpl')

classical Laplacian pyramid: Matlab implementation

    h = [1 4 6 4 1]/16;
    Ie = zeros(2*X, 2*Y);
    Ie(1:2:2*X,1:2:2*Y) = I;
    Ie = 4 * conv2(h, h, Ie, 'same');

else

calling the mex program for spline based pyramids

    Ie = expand2d_mex(I, filter, order);

end

end % end of expand2d_base