checkancestors.m

来自「EZW implementation which will use wavele」· M 代码 · 共 6 行

function   zerotree = checkancestors(j,R,zerotree)
% zerotree=1 means coefficient is descended from zerotree root
% initial set zerotree=0
global N;
i = floor((j+3)/4 ); 
while i>1,
    if R(N(i,1),N(i,2))==1;
        zerotree=1;
        break;
    end;
    i = floor((i+3)/4 );
end