I want function uppper (function's name in my code) should return p1 which is having 7 values. what changes are to made in the code below.

function [p1]= uppper( X )

    [x1,x2,x3,x4]=decomp_mat(X,'haar');x1=x1/2;
  [xx1,xx2,xx3,xx4]=decomp_mat(x1,'haar');xx1=xx1/2;
  [xxx1,xxx2,xxx3,xxx4]=decomp_mat(xx1,'haar');

x1=round(x1);    
x2=round(x2);    
x3=round(x3);   
x4=round(x4);
xx1=round(xx1); 
xx2=round(xx2);  
xx3=round(xx3); 
xx4=round(xx4);
xxx1=round(xxx1);
xxx2=round(xxx2); 
xxx3=round(xxx3); 
xxx4=round(xxx4);

seuil=max(max(xxx1))/2; 
seuil=round(seuil);
map=gray(256);
mm=max(max(xxx1)); 
for i=1:7
   s=seuil;q=s/2;
   XXX1=raff(xxx1,s,q,mm);   
   XXX2=raff(xxx2,s,q,mm);   XXX3=raff(xxx3,s,q,mm);   XXX4=raff(xxx4,s,q,mm);
   XX2=raff(xx2,s,q,mm);   XX3=raff(xx3,s,q,mm);   XX4=raff(xx4,s,q,mm);
   X2=raff(x2,s,q,mm);     X3=raff(x3,s,q,mm);     X4=raff(x4,s,q,mm);

     XX1=reconst_mat(XXX1,XXX2,XXX3,XXX4,'haar');XX1=XX1*2;
     X1=reconst_mat(XX1,XX2,XX3,XX4,'haar');X1=X1*2;
     Y=reconst_mat(X1,X2,X3,X4,'haar');
     figure(i+8),image(Y),colormap(map);
     pause(2);
     [p1]=parametres(X,Y); ;
    pp1(i)=p1  ;  seuil=seuil/2;
     end
  save pp1
  end

on each iteration( for i= 1 to 7) p1 will return PSNR values(7 values), coded in Parameters function

[Guillaume]

The first change to be made is to comment the code to explain what it's doing.

It won't help in getting p1 right, but it'll help in getting an answer.

[tina jain]

on each iteration( for i= 1 to 7) p1 will return PSNR values(7 values), coded in Parameters function

Answer 1

[Geoff Hayes]

Tina - if you want to return all 7 PSNR values, then just change your function signature to

 function [pp1] = uppper( X )

so that the 7 element array is returned instead of the single element p1.

[tina jain]

Thank you sir