PYRDOWN_BASE - Base function for PYRDOWN.

Contents

Syntax

  Ip = PYRDOWN_BASE(I, nlevels, stack, filter, order);

See also

Ressembles: PYRDOWN, PYRUP_BASE. Requires: REDUCE2D_BASE.

Function implementation

function Ip = pyrdown_base(I, nlevels, stack, filter, order)

setting outputs

if stack,    Ip = cell(nlevels);  end;

compute the hierarchical representation

Io = I;

for i=1:nlevels
    Io = reduce2d_base( Io, filter, order );

    if stack % store all the levels of the pyramid
        Ip{i} = Io;
    end
end

if ~stack % store only the ultimate levels of the pyramid
    Ip = Io;
end

end % end of pyrdown_base