checkancestors1.m

这是利用matlab所写的ezw影像压缩法

function   zerotree = checkancestors1(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